From 9ab4b840fdf5e807a8268f0bfd37f4b7fff8ee5a Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Fri, 2 Jun 2017 11:23:42 +0200
Subject: [PATCH] simulation: do not depend on bdd numbers for ordering classes

Fixes #262 again.  Reported by Maximilien Colange.

* spot/twaalgos/simulation.cc: Use state numbers to order classes, not
their signatures.  The problem was that even if two simulation of the
same automaton assign the same signature, the BDD identifier used for
that signature might be different, and therefore the ordering obtained
by using BDDs as keys in a map can be different.  A side-effect of
this change is that the order of states in automata produced by
simulation-based reduction may change; many tests had to be updated.
* tests/core/ltl2tgba.test: Add a new test case based on Maximilien's
report.
* tests/core/complement.test, tests/core/det.test,
tests/core/parseaut.test, tests/core/prodor.test, tests/core/scc.test,
tests/python/atva16-fig2a.ipynb, tests/python/automata.ipynb,
tests/python/decompose.ipynb, tests/python/decompose_scc.py,
tests/python/highlighting.ipynb, tests/python/piperead.ipynb,
tests/python/sccinfo.py, tests/python/simstate.py,
tests/python/testingaut.ipynb, tests/python/word.ipynb: Update
test case for new order of states.
---
 spot/twaalgos/simulation.cc     |  54 +-
 tests/core/complement.test      |   4 +-
 tests/core/det.test             |  42 +-
 tests/core/ltl2tgba.test        |   8 +
 tests/core/parseaut.test        |  50 +-
 tests/core/prodor.test          |  10 +-
 tests/core/scc.test             |   2 +-
 tests/python/atva16-fig2a.ipynb | 118 ++--
 tests/python/automata.ipynb     | 930 ++++++++++++++++----------------
 tests/python/decompose.ipynb    | 650 +++++++++++-----------
 tests/python/decompose_scc.py   |  19 +-
 tests/python/highlighting.ipynb | 122 ++---
 tests/python/piperead.ipynb     |  76 ++-
 tests/python/sccinfo.py         |  10 +-
 tests/python/simstate.py        |  15 +-
 tests/python/testingaut.ipynb   | 532 +++++++++---------
 tests/python/word.ipynb         | 224 +++++---
 17 files changed, 1464 insertions(+), 1402 deletions(-)

diff --git a/spot/twaalgos/simulation.cc b/spot/twaalgos/simulation.cc
index 9fd965a7c..4363a22db 100644
--- a/spot/twaalgos/simulation.cc
+++ b/spot/twaalgos/simulation.cc
@@ -275,7 +275,7 @@ namespace spot
 
         // We run through the map bdd/list<state>, and we update
         // the previous_class_ with the new data.
-        for (auto& p: bdd_lstate_)
+        for (auto& p: sorted_classes_)
           {
             // If the signature of a state is bddfalse (no
             // edges) the class of this state is bddfalse
@@ -283,11 +283,11 @@ namespace spot
             // simplifications in the signature by removing a
             // edge which has as a destination a state with
             // no outgoing edge.
-            if (p.first == bddfalse)
-              for (auto s: p.second)
+            if (p->first == bddfalse)
+              for (unsigned s: p->second)
                 previous_class_[s] = bddfalse;
             else
-              for (auto s: p.second)
+              for (unsigned s: p->second)
                 previous_class_[s] = *it_bdd;
             ++it_bdd;
           }
@@ -302,10 +302,10 @@ namespace spot
           {
             update_previous_class();
             nb_partition_before = bdd_lstate_.size();
-            bdd_lstate_.clear();
             nb_po_before = po_size_;
             po_size_ = 0;
             update_sig();
+            // print_partition();
             go_to_next_it();
           }
 
@@ -347,8 +347,18 @@ namespace spot
 
       void update_sig()
       {
+        bdd_lstate_.clear();
+        sorted_classes_.clear();
         for (unsigned s = 0; s < size_a_; ++s)
-          bdd_lstate_[compute_sig(s)].emplace_back(s);
+          {
+            bdd sig = compute_sig(s);
+            auto p = bdd_lstate_.emplace(std::piecewise_construct,
+                                         std::make_tuple(sig),
+                                         std::make_tuple());
+            p.first->second.emplace_back(s);
+            if (p.second)
+              sorted_classes_.emplace_back(p.first);
+          }
       }
 
 
@@ -390,7 +400,7 @@ namespace spot
 
         std::list<bdd>::iterator it_bdd = used_var_.begin();
 
-        for (auto& p: bdd_lstate_)
+        for (auto& p: sorted_classes_)
           {
             // If the signature of a state is bddfalse (no edges) the
             // class of this state is bddfalse instead of an anonymous
@@ -398,9 +408,9 @@ namespace spot
             // removing an edge which has as a destination a state
             // with no outgoing edge.
             bdd acc = bddfalse;
-            if (p.first != bddfalse)
+            if (p->first != bddfalse)
               acc = *it_bdd;
-            now_to_next.emplace_back(p.first, acc);
+            now_to_next.emplace_back(p->first, acc);
             ++it_bdd;
           }
 
@@ -450,16 +460,16 @@ namespace spot
 
         if (implications)
           implications->resize(bdd_lstate_.size());
-        // Create one state per partition.
-        for (auto& p: bdd_lstate_)
+        // Create one state per class.
+        for (auto& p: sorted_classes_)
           {
-            bdd cl = previous_class_[p.second.front()];
+            bdd cl = previous_class_[p->second.front()];
             // A state may be referred to either by
             // its class, or by all the implied classes.
             auto s = gb->new_state(cl.id());
             gb->alias_state(s, relation_[cl].id());
             // update state_mapping
-            for (auto& st : p.second)
+            for (auto& st : p->second)
               (*state_mapping)[st] = s;
             if (implications)
               (*implications)[s] = relation_[cl];
@@ -479,14 +489,14 @@ namespace spot
         auto all_inf = all_inf_;
         // For each class, we will create
         // all the edges between the states.
-        for (auto& p: bdd_lstate_)
+        for (auto& p: sorted_classes_)
           {
             // All states in p.second have the same class, so just
             // pick the class of the first one first one.
-            bdd src = previous_class_[p.second.front()];
+            bdd src = previous_class_[p->second.front()];
 
             // Get the signature to derive successors.
-            bdd sig = compute_sig(p.second.front());
+            bdd sig = compute_sig(p->second.front());
 
             if (Cosimulation)
               sig = bdd_compose(sig, bddfalse, bdd_var(bdd_initial));
@@ -621,12 +631,12 @@ namespace spot
       // where is the new class name.
       void print_partition()
       {
-        for (auto& p: bdd_lstate_)
+        for (auto& p: sorted_classes_)
           {
             std::cerr << "partition: "
-                      << bdd_format_isop(a_->get_dict(), p.first)
+                      << bdd_format_isop(a_->get_dict(), p->first)
                       << std::endl;
-            for (auto s: p.second)
+            for (auto s: p->second)
               std::cerr << "  - "
                         << a_->format_state(a_->state_from_number(s))
                         << '\n';
@@ -654,9 +664,13 @@ namespace spot
       // Represent the class of each state at the previous iteration.
       vector_state_bdd previous_class_;
 
-      // The list of state for each class at the current_iteration.
+      // The list of states for each class at the current_iteration.
       // Computed in `update_sig'.
       map_bdd_lstate bdd_lstate_;
+      // The above map, sorted by states number instead of BDD
+      // identifier to avoid non-determinism while iterating over all
+      // states.
+      std::vector<map_bdd_lstate::const_iterator> sorted_classes_;
 
       // The queue of free bdd. They will be used as the identifier
       // for the class.
diff --git a/tests/core/complement.test b/tests/core/complement.test
index 6a1f4c1c2..2ef1566ac 100755
--- a/tests/core/complement.test
+++ b/tests/core/complement.test
@@ -118,11 +118,11 @@ properties: trans-labels explicit-labels trans-acc complete
 properties: deterministic stutter-invariant
 --BODY--
 State: 0
-[0] 1 {1}
 [!0] 0
-State: 1
 [0] 1 {1}
+State: 1
 [!0] 0 {0}
+[0] 1 {1}
 --END--
 EOF
 diff out expected
diff --git a/tests/core/det.test b/tests/core/det.test
index 9d4014ee5..eeb7d3c22 100755
--- a/tests/core/det.test
+++ b/tests/core/det.test
@@ -1,7 +1,7 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2013, 2014, 2015, 2016 Laboratoire de Recherche et
-# Développement de l'Epita (LRDE).
+# Copyright (C) 2013-2017 Laboratoire de Recherche et Développement de
+# l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
 #
@@ -148,20 +148,20 @@ cat >expected-nd.hoa <<EOF
 HOA: v1.1
 name: "XGa R (!a & Fa)"
 States: 2
-Start: 1
+Start: 0
 AP: 1 "a"
 acc-name: Buchi
 Acceptance: 1 Inf(0)
 properties: trans-labels explicit-labels state-acc !complete
 properties: !deterministic
-spot.highlight.states: 1 1
-spot.highlight.edges: 2 2 3 2
+spot.highlight.states: 0 1
+spot.highlight.edges: 1 2 2 2
 --BODY--
-State: 0 {0}
-[0] 0
-State: 1
+State: 0
 [!0] 0
 [!0] 1
+State: 1 {0}
+[0] 1
 --END--
 EOF
 diff expected-nd.hoa out-nd.hoa
@@ -173,19 +173,19 @@ cat >expected-rand.hoa <<EOF
 HOA: v1.1
 name: "XGa R (!a & Fa)"
 States: 2
-Start: 0
+Start: 1
 AP: 1 "a"
 acc-name: Buchi
 Acceptance: 1 Inf(0)
 properties: trans-labels explicit-labels state-acc !complete
 properties: !deterministic
-spot.highlight.states: 0 1
+spot.highlight.states: 1 1
 --BODY--
-State: 0
-[!0] 0
+State: 0 {0}
+[0] 0
+State: 1
 [!0] 1
-State: 1 {0}
-[0] 1
+[!0] 0
 --END--
 EOF
 diff expected-rand.hoa rand.hoa
@@ -197,20 +197,20 @@ cat >expected-rand2.hoa <<EOF
 HOA: v1.1
 name: "XGa R (!a & Fa)"
 States: 2
-Start: 0
+Start: 1
 AP: 1 "a"
 acc-name: Buchi
 Acceptance: 1 Inf(0)
 properties: trans-labels explicit-labels state-acc !complete
 properties: !deterministic
-spot.highlight.states: 0 5
-spot.highlight.edges: 1 5 2 5
+spot.highlight.states: 1 5
+spot.highlight.edges: 2 5 3 5
 --BODY--
-State: 0
-[!0] 0
+State: 0 {0}
+[0] 0
+State: 1
 [!0] 1
-State: 1 {0}
-[0] 1
+[!0] 0
 --END--
 EOF
 diff expected-rand2.hoa rand2.hoa
diff --git a/tests/core/ltl2tgba.test b/tests/core/ltl2tgba.test
index a1c08208d..89b4fba75 100755
--- a/tests/core/ltl2tgba.test
+++ b/tests/core/ltl2tgba.test
@@ -255,3 +255,11 @@ ltl2tgba --low --any 'Xp1 xor (Fp1 M (!p1 M (Fp0 W p1)))' \
 ltl2tgba --low --any 'Xp1 xor (Fp1 M (!p1 M (Fp0 W p1)))' "$s" >res2
 ltl2tgba --low --any 'Fp0 -> XXG(1 U Gp1)' "$s" >>res2
 diff res1 res2
+
+# Another case where different but isomorphic automata
+# were output (issue #262 again).
+f1='F(Gp0 <-> Gp1)'
+f2='Gp1 | FGp0'
+(ltl2tgba -xsimul=1 --low "$f1"; ltl2tgba -xsimul=1 --low "$f2") > res1
+ltl2tgba -xsimul=1 --low "$f1" "$f2" > res2
+diff res1 res2
diff --git a/tests/core/parseaut.test b/tests/core/parseaut.test
index c7e952bd3..ae39ed017 100755
--- a/tests/core/parseaut.test
+++ b/tests/core/parseaut.test
@@ -1712,7 +1712,7 @@ cat >expected <<EOF
 HOA: v1
 name: "(c U d) & G(Fa & Fb)"
 States: 3
-Start: 1
+Start: 0
 AP: 4 "c" "d" "a" "b"
 acc-name: generalized-Buchi 2
 Acceptance: 2 Inf(0)&Inf(1)
@@ -1720,39 +1720,39 @@ properties: implicit-labels trans-acc complete deterministic
 properties: stutter-invariant
 --BODY--
 State: 0
+2
 0
+1
+1
+2
 0
+1
+1
+2
 0
+1
+1
+2
 0
-0 {0}
-0 {0}
-0 {0}
-0 {0}
-0 {1}
-0 {1}
-0 {1}
-0 {1}
-0 {0 1}
-0 {0 1}
-0 {0 1}
-0 {0 1}
+1
+1
 State: 1
-2
 1
-0
-0
-2
 1
-0
-0
-2
 1
-0
-0
-2
 1
-0
-0
+1 {0}
+1 {0}
+1 {0}
+1 {0}
+1 {1}
+1 {1}
+1 {1}
+1 {1}
+1 {0 1}
+1 {0 1}
+1 {0 1}
+1 {0 1}
 State: 2
 2
 2
diff --git a/tests/core/prodor.test b/tests/core/prodor.test
index bd8dbec47..35640d6cb 100755
--- a/tests/core/prodor.test
+++ b/tests/core/prodor.test
@@ -1,6 +1,6 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2015 Laboratoire de Recherche et Développement
+# Copyright (C) 2015, 2017 Laboratoire de Recherche et Développement
 # de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
@@ -39,10 +39,10 @@ properties: trans-labels explicit-labels trans-acc complete
 properties: stutter-invariant
 --BODY--
 State: 0
-[0&1] 1 {1}
-[!0&1] 1
 [0] 0 {1}
 [!0] 0
+[0&1] 1 {1}
+[!0&1] 1
 State: 1
 [0&1] 1 {0 1}
 [!0&1] 1 {0}
@@ -70,10 +70,10 @@ Acceptance: 2 Inf(0)&Inf(1)
 properties: trans-labels explicit-labels trans-acc stutter-invariant
 --BODY--
 State: 0
-[0&1] 1 {1}
-[!0&1] 1
 [0] 0 {1}
 [!0] 0
+[0&1] 1 {1}
+[!0&1] 1
 State: 1
 [0&1] 1 {0 1}
 [!0&1] 1 {0}
diff --git a/tests/core/scc.test b/tests/core/scc.test
index dee6d9564..ec1388787 100755
--- a/tests/core/scc.test
+++ b/tests/core/scc.test
@@ -93,8 +93,8 @@ Acceptance: 1 Inf(0)
 properties: trans-labels explicit-labels state-acc
 --BODY--
 State: 0
-[0&2] 1
 [0] 0
+[0&2] 1
 State: 1 {0}
 [2] 1
 --END--
diff --git a/tests/python/atva16-fig2a.ipynb b/tests/python/atva16-fig2a.ipynb
index 6fa7be833..7f0aaa398 100644
--- a/tests/python/atva16-fig2a.ipynb
+++ b/tests/python/atva16-fig2a.ipynb
@@ -97,85 +97,85 @@
         "<text text-anchor=\"start\" x=\"121.75\" y=\"-319.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#f17cb0\">\u2776</text>\n",
         "<text text-anchor=\"start\" x=\"137.75\" y=\"-319.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node2\" class=\"node\"><title>1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-156\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-152.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
-        "<!-- I&#45;&gt;1 -->\n",
-        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-156C2.79388,-156 17.1543,-156 30.6317,-156\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-156 30.9419,-159.15 34.4419,-156 30.9419,-156 30.9419,-156 30.9419,-156 34.4419,-156 30.9418,-152.85 37.9419,-156 37.9419,-156\"/>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-173.037C48.3189,-182.858 50.4453,-192 56,-192 60.166,-192 62.4036,-186.858 62.7128,-180.143\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-173.037 65.8541,-179.882 62.5434,-176.533 62.7076,-180.03 62.7076,-180.03 62.7076,-180.03 62.5434,-176.533 59.561,-180.177 62.3792,-173.037 62.3792,-173.037\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-195.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
         "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"169\" cy=\"-247\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"169\" y=\"-243.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-75\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-71.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M70.6108,-167.158C90.2734,-183.278 126.706,-213.147 149.007,-231.429\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"154.625,-236.035 147.214,-234.033 151.918,-233.816 149.211,-231.597 149.211,-231.597 149.211,-231.597 151.918,-233.816 151.208,-229.161 154.625,-236.035 154.625,-236.035\"/>\n",
-        "<text text-anchor=\"start\" x=\"92\" y=\"-220.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-75C2.79388,-75 17.1543,-75 30.6317,-75\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-75 30.9419,-78.1501 34.4419,-75 30.9419,-75.0001 30.9419,-75.0001 30.9419,-75.0001 34.4419,-75 30.9418,-71.8501 37.9419,-75 37.9419,-75\"/>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;0 -->\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-92.0373C48.3189,-101.858 50.4453,-111 56,-111 60.166,-111 62.4036,-105.858 62.7128,-99.1433\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-92.0373 65.8541,-98.8818 62.5434,-95.5335 62.7076,-99.0296 62.7076,-99.0296 62.7076,-99.0296 62.5434,-95.5335 59.561,-99.1774 62.3792,-92.0373 62.3792,-92.0373\"/>\n",
+        "<text text-anchor=\"start\" x=\"51.5\" y=\"-114.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"169\" cy=\"-118\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"start\" x=\"164.5\" y=\"-114.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M73.3784,-81.3448C92.4242,-88.7229 123.976,-100.946 145.359,-109.229\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"151.915,-111.769 144.25,-112.178 148.652,-110.505 145.388,-109.24 145.388,-109.24 145.388,-109.24 148.652,-110.505 146.526,-106.303 151.915,-111.769 151.915,-111.769\"/>\n",
+        "<text text-anchor=\"start\" x=\"99\" y=\"-107.8\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
         "</g>\n",
         "<!-- 2 -->\n",
         "<g id=\"node4\" class=\"node\"><title>2</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"169\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
         "<text text-anchor=\"middle\" x=\"169\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M68.0489,-142.264C87.9125,-117.568 129.699,-65.6173 152.446,-37.3378\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"156.996,-31.6809 155.063,-39.1098 154.802,-34.4082 152.608,-37.1354 152.608,-37.1354 152.608,-37.1354 154.802,-34.4082 150.154,-35.1611 156.996,-31.6809 156.996,-31.6809\"/>\n",
-        "<text text-anchor=\"start\" x=\"99\" y=\"-114.8\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M72.4341,-67.0744C91.6528,-57.2053 124.596,-40.2883 146.337,-29.1242\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"152.697,-25.8583 147.909,-31.8581 149.584,-27.4571 146.47,-29.056 146.47,-29.056 146.47,-29.056 149.584,-27.4571 145.031,-26.2538 152.697,-25.8583 152.697,-25.8583\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-59.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M159.425,-262.541C156.73,-272.909 159.922,-283 169,-283 175.95,-283 179.45,-277.085 179.499,-269.659\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"178.575,-262.541 182.6,-269.077 179.026,-266.012 179.477,-269.483 179.477,-269.483 179.477,-269.483 179.026,-266.012 176.353,-269.889 178.575,-262.541 178.575,-262.541\"/>\n",
-        "<text text-anchor=\"start\" x=\"148.5\" y=\"-300.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
-        "<text text-anchor=\"start\" x=\"153\" y=\"-286.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
-        "<text text-anchor=\"start\" x=\"169\" y=\"-286.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#f17cb0\">\u2776</text>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M166.467,-136.153C166.078,-145.539 166.922,-154 169,-154 170.526,-154 171.387,-149.437 171.582,-143.295\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"171.533,-136.153 174.731,-143.131 171.557,-139.653 171.581,-143.153 171.581,-143.153 171.581,-143.153 171.557,-139.653 168.431,-143.174 171.533,-136.153 171.533,-136.153\"/>\n",
+        "<text text-anchor=\"start\" x=\"150.5\" y=\"-172.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "<text text-anchor=\"start\" x=\"161\" y=\"-157.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#f17cb0\">\u2776</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M166.467,-36.1527C166.078,-45.5391 166.922,-54 169,-54 170.526,-54 171.387,-49.437 171.582,-43.2953\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"171.533,-36.1527 174.731,-43.1307 171.557,-39.6526 171.581,-43.1525 171.581,-43.1525 171.581,-43.1525 171.557,-39.6526 168.431,-43.1743 171.533,-36.1527 171.533,-36.1527\"/>\n",
-        "<text text-anchor=\"start\" x=\"150.5\" y=\"-72.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
-        "<text text-anchor=\"start\" x=\"161\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#f17cb0\">\u2776</text>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M165.104,-135.577C162.424,-156.718 163.723,-184 169,-184 173.7,-184 175.244,-162.36 173.633,-142.691\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"172.896,-135.577 176.75,-142.215 173.257,-139.059 173.617,-142.54 173.617,-142.54 173.617,-142.54 173.257,-139.059 170.484,-142.864 172.896,-135.577 172.896,-135.577\"/>\n",
+        "<text text-anchor=\"start\" x=\"148.5\" y=\"-187.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M165.104,-35.5771C162.424,-56.718 163.723,-84 169,-84 173.7,-84 175.244,-62.3596 173.633,-42.6907\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"172.896,-35.5771 176.75,-42.2155 173.257,-39.0585 173.617,-42.5399 173.617,-42.5399 173.617,-42.5399 173.257,-39.0585 170.484,-42.8644 172.896,-35.5771 172.896,-35.5771\"/>\n",
-        "<text text-anchor=\"start\" x=\"148.5\" y=\"-87.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge7\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M164.049,-135.467C158.901,-163.149 160.551,-202 169,-202 176.756,-202 178.783,-169.261 175.081,-142.477\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"173.951,-135.467 178.174,-141.877 174.508,-138.923 175.065,-142.378 175.065,-142.378 175.065,-142.378 174.508,-138.923 171.955,-142.879 173.951,-135.467 173.951,-135.467\"/>\n",
+        "<text text-anchor=\"start\" x=\"152\" y=\"-219.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
+        "<text text-anchor=\"start\" x=\"153\" y=\"-205.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<text text-anchor=\"start\" x=\"169\" y=\"-205.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#f17cb0\">\u2776</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M164.049,-35.4671C158.901,-63.1487 160.551,-102 169,-102 176.756,-102 178.783,-69.2613 175.081,-42.4773\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"173.951,-35.4671 178.174,-41.8767 174.508,-38.9225 175.065,-42.3779 175.065,-42.3779 175.065,-42.3779 174.508,-38.9225 171.955,-42.8792 173.951,-35.4671 173.951,-35.4671\"/>\n",
-        "<text text-anchor=\"start\" x=\"152\" y=\"-119.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
-        "<text text-anchor=\"start\" x=\"153\" y=\"-105.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
-        "<text text-anchor=\"start\" x=\"169\" y=\"-105.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#f17cb0\">\u2776</text>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge8\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M163.463,-135.36C155.342,-171.623 157.188,-230 169,-230 180.074,-230 182.389,-178.692 175.943,-142.399\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"174.537,-135.36 178.997,-141.607 175.223,-138.792 175.908,-142.224 175.908,-142.224 175.908,-142.224 175.223,-138.792 172.819,-142.841 174.537,-135.36 174.537,-135.36\"/>\n",
+        "<text text-anchor=\"start\" x=\"150.5\" y=\"-248.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !b</text>\n",
+        "<text text-anchor=\"start\" x=\"161\" y=\"-233.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;2 -->\n",
         "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M163.463,-35.3599C155.342,-71.623 157.188,-130 169,-130 180.074,-130 182.389,-78.6921 175.943,-42.3988\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"174.537,-35.3599 178.997,-41.6073 175.223,-38.7921 175.908,-42.2243 175.908,-42.2243 175.908,-42.2243 175.223,-38.7921 172.819,-42.8414 174.537,-35.3599 174.537,-35.3599\"/>\n",
-        "<text text-anchor=\"start\" x=\"150.5\" y=\"-148.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !b</text>\n",
-        "<text text-anchor=\"start\" x=\"161\" y=\"-133.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M159.425,-33.5414C156.73,-43.9087 159.922,-54 169,-54 175.95,-54 179.45,-48.0847 179.499,-40.6591\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"178.575,-33.5414 182.6,-40.0771 179.026,-37.0123 179.477,-40.4831 179.477,-40.4831 179.477,-40.4831 179.026,-37.0123 176.353,-40.889 178.575,-33.5414 178.575,-33.5414\"/>\n",
+        "<text text-anchor=\"start\" x=\"148.5\" y=\"-71.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<text text-anchor=\"start\" x=\"153\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<text text-anchor=\"start\" x=\"169\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#f17cb0\">\u2776</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f79506d2900> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f6b2060be40> >"
        ]
       }
      ],
diff --git a/tests/python/automata.ipynb b/tests/python/automata.ipynb
index 841518fc9..d3e5cc8f0 100644
--- a/tests/python/automata.ipynb
+++ b/tests/python/automata.ipynb
@@ -177,7 +177,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe56a0540> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae817a8d0> >"
        ]
       }
      ],
@@ -204,113 +204,113 @@
        "output_type": "pyout",
        "prompt_number": 3,
        "svg": [
-        "<svg height=\"351pt\" viewBox=\"0.00 0.00 220.18 351.00\" width=\"220pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<svg height=\"351pt\" viewBox=\"0.00 0.00 226.36 351.00\" width=\"226pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
         "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 347)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" points=\"-4,4 -4,-347 216.176,-347 216.176,4 -4,4\" stroke=\"none\"/>\n",
+        "<polygon fill=\"white\" points=\"-4,4 -4,-347 222.356,-347 222.356,4 -4,4\" stroke=\"none\"/>\n",
         "<!-- I -->\n",
         "<!-- 0 -->\n",
         "<g class=\"node\" id=\"node2\"><title>0</title>\n",
-        "<ellipse cx=\"116.176\" cy=\"-287\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"116.176\" y=\"-283.3\">0</text>\n",
+        "<ellipse cx=\"120.356\" cy=\"-287\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"120.356\" y=\"-283.3\">0</text>\n",
         "</g>\n",
         "<!-- I&#45;&gt;0 -->\n",
         "<g class=\"edge\" id=\"edge1\"><title>I-&gt;0</title>\n",
-        "<path d=\"M116.176,-341.845C116.176,-340.206 116.176,-325.846 116.176,-312.368\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"116.176,-305.058 119.326,-312.058 116.176,-308.558 116.176,-312.058 116.176,-312.058 116.176,-312.058 116.176,-308.558 113.026,-312.058 116.176,-305.058 116.176,-305.058\" stroke=\"black\"/>\n",
+        "<path d=\"M120.356,-341.845C120.356,-340.206 120.356,-325.846 120.356,-312.368\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"120.356,-305.058 123.506,-312.058 120.356,-308.558 120.356,-312.058 120.356,-312.058 120.356,-312.058 120.356,-308.558 117.206,-312.058 120.356,-305.058 120.356,-305.058\" stroke=\"black\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
         "<g class=\"edge\" id=\"edge2\"><title>0-&gt;0</title>\n",
-        "<path d=\"M133.213,-293.379C143.033,-294.681 152.176,-292.555 152.176,-287 152.176,-282.834 147.033,-280.596 140.319,-280.287\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"133.213,-280.621 140.057,-277.146 136.709,-280.457 140.205,-280.292 140.205,-280.292 140.205,-280.292 136.709,-280.457 140.353,-283.439 133.213,-280.621 133.213,-280.621\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"168.676\" y=\"-283.3\">a &amp; !b</text>\n",
+        "<path d=\"M137.393,-293.379C147.214,-294.681 156.356,-292.555 156.356,-287 156.356,-282.834 151.214,-280.596 144.499,-280.287\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"137.393,-280.621 144.238,-277.146 140.89,-280.457 144.386,-280.292 144.386,-280.292 144.386,-280.292 140.89,-280.457 144.533,-283.439 137.393,-280.621 137.393,-280.621\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"174.856\" y=\"-283.3\">a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 1 -->\n",
         "<g class=\"node\" id=\"node3\"><title>1</title>\n",
-        "<ellipse cx=\"63.1755\" cy=\"-196\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<ellipse cx=\"63.1755\" cy=\"-196\" fill=\"none\" rx=\"22\" ry=\"22\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"63.1755\" y=\"-192.3\">1</text>\n",
+        "<ellipse cx=\"67.3561\" cy=\"-196\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<ellipse cx=\"67.3561\" cy=\"-196\" fill=\"none\" rx=\"22\" ry=\"22\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"67.3561\" y=\"-192.3\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
         "<g class=\"edge\" id=\"edge3\"><title>0-&gt;1</title>\n",
-        "<path d=\"M107.185,-270.902C99.1023,-257.33 87.0865,-237.152 77.6514,-221.309\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"74.0458,-215.254 80.3339,-219.656 75.8366,-218.261 77.6274,-221.268 77.6274,-221.268 77.6274,-221.268 75.8366,-218.261 74.9209,-222.88 74.0458,-215.254 74.0458,-215.254\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"98.6755\" y=\"-239.8\">b</text>\n",
+        "<path d=\"M111.365,-270.902C103.283,-257.33 91.2671,-237.152 81.832,-221.309\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"78.2263,-215.254 84.5144,-219.656 80.0171,-218.261 81.808,-221.268 81.808,-221.268 81.808,-221.268 80.0171,-218.261 79.1015,-222.88 78.2263,-215.254 78.2263,-215.254\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"102.856\" y=\"-239.8\">b</text>\n",
         "</g>\n",
         "<!-- 4 -->\n",
         "<g class=\"node\" id=\"node4\"><title>4</title>\n",
-        "<ellipse cx=\"169.176\" cy=\"-196\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"169.176\" y=\"-192.3\">4</text>\n",
+        "<ellipse cx=\"175.356\" cy=\"-196\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"175.356\" y=\"-192.3\">4</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;4 -->\n",
         "<g class=\"edge\" id=\"edge4\"><title>0-&gt;4</title>\n",
-        "<path d=\"M125.166,-270.902C133.822,-256.367 146.99,-234.255 156.667,-218.005\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"160.318,-211.875 159.442,-219.501 158.527,-214.882 156.736,-217.889 156.736,-217.889 156.736,-217.889 158.527,-214.882 154.029,-216.277 160.318,-211.875 160.318,-211.875\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"163.176\" y=\"-239.8\">!a &amp; !b</text>\n",
+        "<path d=\"M129.438,-271.303C138.435,-256.746 152.298,-234.312 162.439,-217.902\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"166.26,-211.718 165.26,-219.329 164.42,-214.696 162.581,-217.673 162.581,-217.673 162.581,-217.673 164.42,-214.696 159.901,-216.017 166.26,-211.718 166.26,-211.718\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"170.856\" y=\"-239.8\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;1 -->\n",
         "<g class=\"edge\" id=\"edge5\"><title>1-&gt;1</title>\n",
-        "<path d=\"M83.7563,-204.37C94.0202,-205.528 103.176,-202.738 103.176,-196 103.176,-190.946 98.0257,-188.113 91.1207,-187.501\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"83.7563,-187.63 90.7003,-184.358 87.2558,-187.569 90.7553,-187.508 90.7553,-187.508 90.7553,-187.508 87.2558,-187.569 90.8102,-190.657 83.7563,-187.63 83.7563,-187.63\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"118.176\" y=\"-192.3\">c &amp; d</text>\n",
+        "<path d=\"M87.9369,-204.37C98.2008,-205.528 107.356,-202.738 107.356,-196 107.356,-190.946 102.206,-188.113 95.3012,-187.501\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"87.9369,-187.63 94.8809,-184.358 91.4364,-187.569 94.9358,-187.508 94.9358,-187.508 94.9358,-187.508 91.4364,-187.569 94.9907,-190.657 87.9369,-187.63 87.9369,-187.63\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"123.356\" y=\"-192.3\">c &amp; d</text>\n",
         "</g>\n",
         "<!-- 2 -->\n",
         "<g class=\"node\" id=\"node5\"><title>2</title>\n",
-        "<ellipse cx=\"64.1755\" cy=\"-18\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"64.1755\" y=\"-14.3\">2</text>\n",
+        "<ellipse cx=\"68.3561\" cy=\"-18\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"68.3561\" y=\"-14.3\">2</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;2 -->\n",
         "<g class=\"edge\" id=\"edge6\"><title>1-&gt;2</title>\n",
-        "<path d=\"M46.8076,-181.236C32.4563,-168.007 12.6056,-146.588 4.17551,-123 -1.20916,-107.933 -1.48317,-101.966 4.17551,-87 12.2372,-65.6786 30.3712,-46.7242 44.6062,-34.2791\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"50.0362,-29.6769 46.7329,-36.6059 47.3662,-31.9399 44.6962,-34.2029 44.6962,-34.2029 44.6962,-34.2029 47.3662,-31.9399 42.6595,-31.7998 50.0362,-29.6769 50.0362,-29.6769\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"20.6755\" y=\"-101.3\">!c &amp; d</text>\n",
+        "<path d=\"M50.199,-181.727C34.8703,-168.686 13.4697,-147.255 4.35608,-123 -1.27155,-108.022 -1.54226,-101.873 4.35608,-87 13.1144,-64.9152 32.818,-45.8318 48.0656,-33.5506\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"53.866,-29.0284 50.2823,-35.8166 51.1058,-31.1804 48.3455,-33.3324 48.3455,-33.3324 48.3455,-33.3324 51.1058,-31.1804 46.4087,-30.8481 53.866,-29.0284 53.866,-29.0284\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"22.8561\" y=\"-101.3\">!c &amp; d</text>\n",
         "</g>\n",
         "<!-- 3 -->\n",
         "<g class=\"node\" id=\"node6\"><title>3</title>\n",
-        "<ellipse cx=\"64.1755\" cy=\"-105\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"64.1755\" y=\"-101.3\">3</text>\n",
+        "<ellipse cx=\"68.3561\" cy=\"-105\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"68.3561\" y=\"-101.3\">3</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;3 -->\n",
         "<g class=\"edge\" id=\"edge7\"><title>1-&gt;3</title>\n",
-        "<path d=\"M53.2767,-176.138C49.0477,-165.827 45.6086,-152.789 48.1755,-141 49.1456,-136.544 50.7357,-131.977 52.5462,-127.674\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"55.5153,-121.184 55.4677,-128.86 54.0593,-124.366 52.6032,-127.549 52.6032,-127.549 52.6032,-127.549 54.0593,-124.366 49.7387,-126.239 55.5153,-121.184 55.5153,-121.184\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"53.1755\" y=\"-144.8\">!d</text>\n",
+        "<path d=\"M56.8135,-176.159C52.3073,-165.855 48.6383,-152.816 51.3561,-141 52.4094,-136.42 54.1455,-131.745 56.1156,-127.365\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"59.3394,-120.78 59.0906,-128.452 57.8004,-123.923 56.2615,-127.067 56.2615,-127.067 56.2615,-127.067 57.8004,-123.923 53.4323,-125.682 59.3394,-120.78 59.3394,-120.78\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"57.3561\" y=\"-144.8\">!d</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;4 -->\n",
         "<g class=\"edge\" id=\"edge13\"><title>4-&gt;4</title>\n",
-        "<path d=\"M185.466,-204.016C195.565,-205.949 205.176,-203.277 205.176,-196 205.176,-190.542 199.769,-187.674 192.806,-187.397\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"185.466,-187.984 192.193,-184.286 188.955,-187.705 192.444,-187.426 192.444,-187.426 192.444,-187.426 188.955,-187.705 192.694,-190.566 185.466,-187.984 185.466,-187.984\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"208.676\" y=\"-192.3\">1</text>\n",
+        "<path d=\"M191.646,-204.016C201.745,-205.949 211.356,-203.277 211.356,-196 211.356,-190.542 205.95,-187.674 198.986,-187.397\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"191.646,-187.984 198.373,-184.286 195.135,-187.705 198.624,-187.426 198.624,-187.426 198.624,-187.426 195.135,-187.705 198.875,-190.566 191.646,-187.984 191.646,-187.984\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"214.856\" y=\"-192.3\">1</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;1 -->\n",
         "<g class=\"edge\" id=\"edge8\"><title>2-&gt;1</title>\n",
-        "<path d=\"M77.8501,-30.0814C85.3082,-36.5564 94.3776,-45.173 101.176,-54 120.513,-79.1097 128.036,-92.5709 119.176,-123 113.156,-143.671 97.7364,-162.693 84.5983,-175.987\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"79.5143,-180.969 82.3093,-173.82 82.0142,-178.52 84.514,-176.07 84.514,-176.07 84.514,-176.07 82.0142,-178.52 86.7187,-178.32 79.5143,-180.969 79.5143,-180.969\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"125.676\" y=\"-101.3\">c</text>\n",
+        "<path d=\"M82.9697,-29.0929C91.4609,-35.4971 101.918,-44.3722 109.356,-54 128.603,-78.9113 134.158,-92.7751 125.356,-123 119.215,-144.088 103.068,-163.203 89.3663,-176.43\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"84.0682,-181.376 87.035,-174.297 86.6265,-178.988 89.1847,-176.599 89.1847,-176.599 89.1847,-176.599 86.6265,-178.988 91.3345,-178.901 84.0682,-181.376 84.0682,-181.376\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"132.856\" y=\"-101.3\">c</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;2 -->\n",
         "<g class=\"edge\" id=\"edge9\"><title>2-&gt;2</title>\n",
-        "<path d=\"M80.8396,-25.3828C90.8005,-27.0234 100.176,-24.5625 100.176,-18 100.176,-13.0781 94.9021,-10.4634 88.0631,-10.1558\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"80.8396,-10.6172 87.6245,-7.02727 84.3325,-10.394 87.8253,-10.1709 87.8253,-10.1709 87.8253,-10.1709 84.3325,-10.394 88.0262,-13.3145 80.8396,-10.6172 80.8396,-10.6172\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"105.176\" y=\"-14.3\">!c</text>\n",
+        "<path d=\"M85.0201,-25.3828C94.9811,-27.0234 104.356,-24.5625 104.356,-18 104.356,-13.0781 99.0826,-10.4634 92.2436,-10.1558\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"85.0201,-10.6172 91.8051,-7.02727 88.513,-10.394 92.0059,-10.1709 92.0059,-10.1709 92.0059,-10.1709 88.513,-10.394 92.2067,-13.3145 85.0201,-10.6172 85.0201,-10.6172\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"109.856\" y=\"-14.3\">!c</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;1 -->\n",
         "<g class=\"edge\" id=\"edge10\"><title>3-&gt;1</title>\n",
-        "<path d=\"M63.9838,-123.066C63.8452,-135.398 63.6549,-152.339 63.4937,-166.682\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"63.4125,-173.908 60.3414,-166.873 63.4519,-170.408 63.4912,-166.909 63.4912,-166.909 63.4912,-166.909 63.4519,-170.408 66.641,-166.944 63.4125,-173.908 63.4125,-173.908\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"79.1755\" y=\"-144.8\">c &amp; d</text>\n",
+        "<path d=\"M68.1643,-123.066C68.0258,-135.398 67.8354,-152.339 67.6743,-166.682\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"67.5931,-173.908 64.522,-166.873 67.6324,-170.408 67.6718,-166.909 67.6718,-166.909 67.6718,-166.909 67.6324,-170.408 70.8216,-166.944 67.5931,-173.908 67.5931,-173.908\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"84.3561\" y=\"-144.8\">c &amp; d</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;2 -->\n",
         "<g class=\"edge\" id=\"edge11\"><title>3-&gt;2</title>\n",
-        "<path d=\"M64.1755,-86.799C64.1755,-74.3561 64.1755,-57.3644 64.1755,-43.5044\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"64.1755,-36.1754 67.3256,-43.1754 64.1756,-39.6754 64.1756,-43.1754 64.1756,-43.1754 64.1756,-43.1754 64.1756,-39.6754 61.0256,-43.1755 64.1755,-36.1754 64.1755,-36.1754\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"80.6755\" y=\"-57.8\">!c &amp; d</text>\n",
+        "<path d=\"M68.3561,-86.799C68.3561,-74.3561 68.3561,-57.3644 68.3561,-43.5044\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"68.3561,-36.1754 71.5062,-43.1754 68.3561,-39.6754 68.3562,-43.1754 68.3562,-43.1754 68.3562,-43.1754 68.3561,-39.6754 65.2062,-43.1755 68.3561,-36.1754 68.3561,-36.1754\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"86.8561\" y=\"-57.8\">!c &amp; d</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;3 -->\n",
         "<g class=\"edge\" id=\"edge12\"><title>3-&gt;3</title>\n",
-        "<path d=\"M80.8396,-112.383C90.8005,-114.023 100.176,-111.562 100.176,-105 100.176,-100.078 94.9021,-97.4634 88.0631,-97.1558\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"80.8396,-97.6172 87.6245,-94.0273 84.3325,-97.394 87.8253,-97.1709 87.8253,-97.1709 87.8253,-97.1709 84.3325,-97.394 88.0262,-100.314 80.8396,-97.6172 80.8396,-97.6172\" stroke=\"black\"/>\n",
-        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"105.176\" y=\"-101.3\">!d</text>\n",
+        "<path d=\"M85.0201,-112.383C94.9811,-114.023 104.356,-111.562 104.356,-105 104.356,-100.078 99.0826,-97.4634 92.2436,-97.1558\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"85.0201,-97.6172 91.8051,-94.0273 88.513,-97.394 92.0059,-97.1709 92.0059,-97.1709 92.0059,-97.1709 88.513,-97.394 92.2067,-100.314 85.0201,-97.6172 85.0201,-97.6172\" stroke=\"black\"/>\n",
+        "<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"110.356\" y=\"-101.3\">!d</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>"
@@ -371,7 +371,7 @@
         "<polygon fill=\"black\" points=\"37.9419,-49 30.9419,-52.1501 34.4419,-49 30.9419,-49.0001 30.9419,-49.0001 30.9419,-49.0001 34.4419,-49 30.9418,-45.8501 37.9419,-49 37.9419,-49\" stroke=\"black\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
-        "<g class=\"edge\" id=\"edge11\"><title>0-&gt;0</title>\n",
+        "<g class=\"edge\" id=\"edge2\"><title>0-&gt;0</title>\n",
         "<path d=\"M49.6208,-66.0373C48.3189,-75.8579 50.4453,-85 56,-85 60.166,-85 62.4036,-79.8576 62.7128,-73.1433\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"62.3792,-66.0373 65.8541,-72.8818 62.5434,-69.5335 62.7076,-73.0296 62.7076,-73.0296 62.7076,-73.0296 62.5434,-69.5335 59.561,-73.1774 62.3792,-66.0373 62.3792,-66.0373\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"37.5\" y=\"-88.8\">a &amp; !b</text>\n",
@@ -382,7 +382,7 @@
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"169\" y=\"-189.3\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge12\"><title>0-&gt;1</title>\n",
+        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;1</title>\n",
         "<path d=\"M67.6431,-62.8073C87.4829,-88.5454 130.165,-143.916 152.947,-173.472\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"157.226,-179.023 150.458,-175.402 155.089,-176.251 152.952,-173.479 152.952,-173.479 152.952,-173.479 155.089,-176.251 155.447,-171.556 157.226,-179.023 157.226,-179.023\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"108\" y=\"-150.8\">b</text>\n",
@@ -393,13 +393,13 @@
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"169\" y=\"-30.3\">4</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge13\"><title>0-&gt;4</title>\n",
+        "<g class=\"edge\" id=\"edge4\"><title>0-&gt;4</title>\n",
         "<path d=\"M73.8585,-46.7218C92.5211,-44.1998 122.756,-40.114 143.912,-37.2551\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"150.983,-36.2996 144.468,-40.3588 147.514,-36.7684 144.046,-37.2371 144.046,-37.2371 144.046,-37.2371 147.514,-36.7684 143.624,-34.1155 150.983,-36.2996 150.983,-36.2996\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"92\" y=\"-48.8\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge2\"><title>1-&gt;1</title>\n",
+        "<g class=\"edge\" id=\"edge5\"><title>1-&gt;1</title>\n",
         "<path d=\"M160.021,-208.916C157.679,-219.15 160.672,-229 169,-229 175.376,-229 178.625,-223.226 178.746,-215.927\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"177.979,-208.916 181.872,-215.532 178.36,-212.395 178.741,-215.874 178.741,-215.874 178.741,-215.874 178.36,-212.395 175.61,-216.217 177.979,-208.916 177.979,-208.916\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"152\" y=\"-247.8\">c &amp; d</text>\n",
@@ -411,7 +411,7 @@
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"385\" y=\"-189.3\">2</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge3\"><title>1-&gt;2</title>\n",
+        "<g class=\"edge\" id=\"edge6\"><title>1-&gt;2</title>\n",
         "<path d=\"M183.382,-181.807C199.601,-169.041 228.334,-148.914 257,-141 296.803,-130.011 340.921,-157.735 365.268,-176.79\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"371.017,-181.419 363.59,-179.483 368.291,-179.224 365.565,-177.029 365.565,-177.029 365.565,-177.029 368.291,-179.224 367.54,-174.576 371.017,-181.419 371.017,-181.419\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"257\" y=\"-159.8\">!c &amp; d</text>\n",
@@ -423,44 +423,44 @@
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"275.5\" y=\"-240.3\">3</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge4\"><title>1-&gt;3</title>\n",
+        "<g class=\"edge\" id=\"edge7\"><title>1-&gt;3</title>\n",
         "<path d=\"M186.45,-197.514C200.79,-201.783 221.911,-208.888 239,-218 244.62,-220.997 250.345,-224.799 255.51,-228.565\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"261.277,-232.918 253.792,-231.215 258.484,-230.809 255.69,-228.701 255.69,-228.701 255.69,-228.701 258.484,-230.809 257.588,-226.187 261.277,-232.918 261.277,-232.918\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"215.5\" y=\"-236.8\">!d</text>\n",
         "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"214\" y=\"-221.8\">\u24ff</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge5\"><title>2-&gt;1</title>\n",
+        "<g class=\"edge\" id=\"edge8\"><title>2-&gt;1</title>\n",
         "<path d=\"M366.768,-193C328.813,-193 237.915,-193 194.238,-193\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"187.151,-193 194.151,-189.85 190.651,-193 194.151,-193 194.151,-193 194.151,-193 190.651,-193 194.151,-196.15 187.151,-193 187.151,-193\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"272\" y=\"-196.8\">c</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge6\"><title>2-&gt;2</title>\n",
+        "<g class=\"edge\" id=\"edge9\"><title>2-&gt;2</title>\n",
         "<path d=\"M375.767,-208.541C373.169,-218.909 376.246,-229 385,-229 391.702,-229 395.077,-223.085 395.124,-215.659\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"394.233,-208.541 398.229,-215.095 394.668,-212.014 395.103,-215.487 395.103,-215.487 395.103,-215.487 394.668,-212.014 391.977,-215.879 394.233,-208.541 394.233,-208.541\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"379.5\" y=\"-232.8\">!c</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;1</title>\n",
+        "<g class=\"edge\" id=\"edge10\"><title>3-&gt;1</title>\n",
         "<path d=\"M258.25,-249.586C243.436,-253.647 221.422,-257.015 205,-248 192.725,-241.262 184.14,-228.191 178.545,-216.482\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"175.592,-209.803 181.304,-214.931 177.007,-213.004 178.423,-216.205 178.423,-216.205 178.423,-216.205 177.007,-213.004 175.542,-217.479 175.592,-209.803 175.592,-209.803\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"205\" y=\"-256.8\">c &amp; d</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;2</title>\n",
+        "<g class=\"edge\" id=\"edge11\"><title>3-&gt;2</title>\n",
         "<path d=\"M292.362,-236.475C310.807,-227.724 341.364,-213.227 362.073,-203.403\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"368.422,-200.39 363.448,-206.237 365.26,-201.891 362.098,-203.391 362.098,-203.391 362.098,-203.391 365.26,-201.891 360.748,-200.545 368.422,-200.39 368.422,-200.39\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"312\" y=\"-229.8\">!c &amp; d</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge9\"><title>3-&gt;3</title>\n",
+        "<g class=\"edge\" id=\"edge12\"><title>3-&gt;3</title>\n",
         "<path d=\"M266.521,-259.916C264.179,-270.15 267.172,-280 275.5,-280 281.876,-280 285.125,-274.226 285.246,-266.927\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"284.479,-259.916 288.372,-266.532 284.86,-263.395 285.241,-266.874 285.241,-266.874 285.241,-266.874 284.86,-263.395 282.11,-267.217 284.479,-259.916 284.479,-259.916\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"269\" y=\"-283.8\">!d</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge10\"><title>4-&gt;4</title>\n",
+        "<g class=\"edge\" id=\"edge13\"><title>4-&gt;4</title>\n",
         "<path d=\"M160.021,-49.916C157.679,-60.1504 160.672,-70 169,-70 175.376,-70 178.625,-64.2263 178.746,-56.9268\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"177.979,-49.916 181.872,-56.5315 178.36,-53.3952 178.741,-56.8744 178.741,-56.8744 178.741,-56.8744 178.36,-53.3952 175.61,-57.2174 177.979,-49.916 177.979,-49.916\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"169\" y=\"-73.8\">1</text>\n",
@@ -569,7 +569,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4d87f90> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816aa20> >"
        ]
       }
      ],
@@ -639,7 +639,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da41b0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816a4b0> >"
        ]
       }
      ],
@@ -715,7 +715,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4e0f330> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816a300> >"
        ]
       }
      ],
@@ -1061,121 +1061,121 @@
         "<!-- Generated by graphviz version 2.38.0 (20140413.2041)\n",
         " -->\n",
         "<!-- Title: G Pages: 1 -->\n",
-        "<svg width=\"302pt\" height=\"295pt\"\n",
-        " viewBox=\"0.00 0.00 301.50 295.16\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 291.16)\">\n",
+        "<svg width=\"302pt\" height=\"311pt\"\n",
+        " viewBox=\"0.00 0.00 301.50 311.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 307)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-291.16 297.5,-291.16 297.5,4 -4,4\"/>\n",
+        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-307 297.5,-307 297.5,4 -4,4\"/>\n",
         "<!-- I -->\n",
         "<!-- 0 -->\n",
         "<g id=\"node2\" class=\"node\"><title>0</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-107.16\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-103.46\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-123\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-119.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
         "<!-- I&#45;&gt;0 -->\n",
         "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-107.16C2.79388,-107.16 17.1543,-107.16 30.6317,-107.16\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-107.16 30.9419,-110.31 34.4419,-107.16 30.9419,-107.16 30.9419,-107.16 30.9419,-107.16 34.4419,-107.16 30.9418,-104.01 37.9419,-107.16 37.9419,-107.16\"/>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-123C2.79388,-123 17.1543,-123 30.6317,-123\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-123 30.9419,-126.15 34.4419,-123 30.9419,-123 30.9419,-123 30.9419,-123 34.4419,-123 30.9418,-119.85 37.9419,-123 37.9419,-123\"/>\n",
         "</g>\n",
         "<!-- 1 -->\n",
         "<g id=\"node3\" class=\"node\"><title>1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"157.5\" cy=\"-188.16\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"157.5\" y=\"-184.46\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"157.5\" cy=\"-204\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"157.5\" y=\"-200.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
         "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M66.5112,-121.807C72.9549,-130.98 82.0794,-142.636 92,-151.16 104.757,-162.122 121.236,-171.509 134.344,-178.086\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"140.854,-181.263 133.181,-181.024 137.708,-179.728 134.563,-178.193 134.563,-178.193 134.563,-178.193 137.708,-179.728 135.944,-175.362 140.854,-181.263 140.854,-181.263\"/>\n",
-        "<text text-anchor=\"middle\" x=\"105.5\" y=\"-172.96\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M66.5112,-137.647C72.9549,-146.82 82.0794,-158.476 92,-167 104.757,-177.961 121.236,-187.349 134.344,-193.926\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"140.854,-197.102 133.181,-196.863 137.708,-195.567 134.563,-194.032 134.563,-194.032 134.563,-194.032 137.708,-195.567 135.944,-191.202 140.854,-197.102 140.854,-197.102\"/>\n",
+        "<text text-anchor=\"middle\" x=\"105.5\" y=\"-188.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 2 -->\n",
         "<g id=\"node4\" class=\"node\"><title>2</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"273\" cy=\"-127.16\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"273\" y=\"-123.46\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"157.5\" cy=\"-66\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"157.5\" y=\"-62.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;2 -->\n",
         "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M74.1079,-109.003C100.327,-111.801 152.035,-117.211 196,-121.16 213.175,-122.703 232.554,-124.23 247.444,-125.357\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"254.786,-125.908 247.57,-128.525 251.296,-125.646 247.806,-125.384 247.806,-125.384 247.806,-125.384 251.296,-125.646 248.042,-122.243 254.786,-125.908 254.786,-125.908\"/>\n",
-        "<text text-anchor=\"start\" x=\"137\" y=\"-122.96\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M72.1119,-114.343C89.0117,-104.662 116.498,-88.9157 135.486,-78.0382\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"141.572,-74.5518 137.064,-80.7647 138.535,-76.2916 135.498,-78.0314 135.498,-78.0314 135.498,-78.0314 138.535,-76.2916 133.932,-75.2981 141.572,-74.5518 141.572,-74.5518\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-105.8\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
         "</g>\n",
         "<!-- 3 -->\n",
         "<g id=\"node5\" class=\"node\"><title>3</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"157.5\" cy=\"-50.1603\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"157.5\" y=\"-46.4603\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"273\" cy=\"-123\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"273\" y=\"-119.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;3 -->\n",
         "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M72.1119,-98.5032C89.0117,-88.8219 116.498,-73.076 135.486,-62.1985\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"141.572,-58.7121 137.064,-64.925 138.535,-60.4519 135.498,-62.1917 135.498,-62.1917 135.498,-62.1917 138.535,-60.4519 133.932,-59.4584 141.572,-58.7121 141.572,-58.7121\"/>\n",
-        "<text text-anchor=\"start\" x=\"92\" y=\"-89.9603\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M74.0034,-126.729C106.092,-133.193 177.685,-144.886 237,-135 241.14,-134.31 245.447,-133.19 249.566,-131.905\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"256.258,-129.634 250.642,-134.867 252.943,-130.759 249.629,-131.884 249.629,-131.884 249.629,-131.884 252.943,-130.759 248.617,-128.901 256.258,-129.634 256.258,-129.634\"/>\n",
+        "<text text-anchor=\"start\" x=\"137\" y=\"-141.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 4 -->\n",
         "<g id=\"node6\" class=\"node\"><title>4</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"273\" cy=\"-31.1603\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"273\" y=\"-27.4603\" font-family=\"Lato\" font-size=\"14.00\">4</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"273\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"273\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">4</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;4 -->\n",
         "<g id=\"edge5\" class=\"edge\"><title>0&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M64.2827,-91.086C75.861,-67.75 100.908,-25.398 137,-8.1603 173.984,9.50377 222.376,-7.05194 250.041,-19.7503\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"256.608,-22.8724 248.934,-22.7117 253.447,-21.3696 250.286,-19.8668 250.286,-19.8668 250.286,-19.8668 253.447,-21.3696 251.639,-17.0219 256.608,-22.8724 256.608,-22.8724\"/>\n",
-        "<text text-anchor=\"start\" x=\"137\" y=\"-11.9603\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M64.5788,-106.747C76.3694,-83.5932 101.497,-41.9353 137,-24 172.369,-6.13214 219.835,-9.23041 248.037,-13.4066\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"255.114,-14.5378 247.705,-16.5434 251.658,-13.9853 248.202,-13.4328 248.202,-13.4328 248.202,-13.4328 251.658,-13.9853 248.699,-10.3223 255.114,-14.5378 255.114,-14.5378\"/>\n",
+        "<text text-anchor=\"start\" x=\"137\" y=\"-27.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;1 -->\n",
         "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M152.858,-205.57C151.992,-215.248 153.539,-224.16 157.5,-224.16 160.409,-224.16 162.016,-219.354 162.321,-212.968\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"162.142,-205.57 165.461,-212.492 162.227,-209.069 162.312,-212.568 162.312,-212.568 162.312,-212.568 162.227,-209.069 159.163,-212.645 162.142,-205.57 162.142,-205.57\"/>\n",
-        "<text text-anchor=\"start\" x=\"153\" y=\"-242.96\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
-        "<text text-anchor=\"start\" x=\"149.5\" y=\"-227.96\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M152.858,-221.41C151.992,-231.088 153.539,-240 157.5,-240 160.409,-240 162.016,-235.194 162.321,-228.807\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"162.142,-221.41 165.461,-228.331 162.227,-224.909 162.312,-228.408 162.312,-228.408 162.312,-228.408 162.227,-224.909 159.163,-228.484 162.142,-221.41 162.142,-221.41\"/>\n",
+        "<text text-anchor=\"start\" x=\"153\" y=\"-258.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
+        "<text text-anchor=\"start\" x=\"149.5\" y=\"-243.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;1 -->\n",
         "<g id=\"edge7\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M150.502,-204.756C145.214,-226.024 147.547,-254.16 157.5,-254.16 166.403,-254.16 169.209,-231.646 165.917,-211.673\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"164.498,-204.756 168.991,-210.981 165.202,-208.185 165.905,-211.613 165.905,-211.613 165.905,-211.613 165.202,-208.185 162.819,-212.246 164.498,-204.756 164.498,-204.756\"/>\n",
-        "<text text-anchor=\"start\" x=\"151\" y=\"-257.96\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M150.502,-220.596C145.214,-241.863 147.547,-270 157.5,-270 166.403,-270 169.209,-247.485 165.917,-227.513\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"164.498,-220.596 168.991,-226.82 165.202,-224.025 165.905,-227.453 165.905,-227.453 165.905,-227.453 165.202,-224.025 162.819,-228.086 164.498,-220.596 164.498,-220.596\"/>\n",
+        "<text text-anchor=\"start\" x=\"151\" y=\"-273.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;2 -->\n",
         "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M263.425,-142.702C260.73,-153.069 263.922,-163.16 273,-163.16 279.95,-163.16 283.45,-157.245 283.499,-149.819\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"282.575,-142.702 286.6,-149.237 283.026,-146.173 283.477,-149.643 283.477,-149.643 283.477,-149.643 283.026,-146.173 280.353,-150.049 282.575,-142.702 282.575,-142.702\"/>\n",
-        "<text text-anchor=\"start\" x=\"252.5\" y=\"-181.96\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
-        "<text text-anchor=\"start\" x=\"265\" y=\"-166.96\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M148.521,-81.916C146.179,-92.1504 149.172,-102 157.5,-102 163.876,-102 167.125,-96.2263 167.246,-88.9268\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"166.479,-81.916 170.372,-88.5315 166.86,-85.3952 167.241,-88.8744 167.241,-88.8744 167.241,-88.8744 166.86,-85.3952 164.11,-89.2174 166.479,-81.916 166.479,-81.916\"/>\n",
+        "<text text-anchor=\"start\" x=\"144\" y=\"-105.8\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;3 -->\n",
+        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M169.815,-79.2791C176.712,-86.6222 186.087,-95.3722 196,-101 212.117,-110.15 232.356,-115.766 247.895,-119.032\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"255.107,-120.451 247.631,-122.19 251.673,-119.775 248.239,-119.099 248.239,-119.099 248.239,-119.099 251.673,-119.775 248.847,-116.009 255.107,-120.451 255.107,-120.451\"/>\n",
+        "<text text-anchor=\"start\" x=\"196\" y=\"-119.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;4 -->\n",
+        "<g id=\"edge10\" class=\"edge\"><title>2&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M174.076,-58.2162C180.773,-54.9495 188.72,-51.1791 196,-48 213.699,-40.2709 234.068,-32.2776 249.262,-26.4873\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"255.85,-23.9908 250.42,-29.4169 252.577,-25.231 249.304,-26.4713 249.304,-26.4713 249.304,-26.4713 252.577,-25.231 248.188,-23.5256 255.85,-23.9908 255.85,-23.9908\"/>\n",
+        "<text text-anchor=\"start\" x=\"196\" y=\"-51.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;2 -->\n",
-        "<g id=\"edge9\" class=\"edge\"><title>3&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M172.875,-59.9124C192.831,-73.4509 229.029,-98.0082 251.724,-113.405\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"257.742,-117.487 250.181,-116.164 254.845,-115.522 251.949,-113.557 251.949,-113.557 251.949,-113.557 254.845,-115.522 253.718,-110.951 257.742,-117.487 257.742,-117.487\"/>\n",
-        "<text text-anchor=\"start\" x=\"196\" y=\"-105.96\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M262.811,-107.876C256.615,-98.9778 247.642,-88.2732 237,-82 220.479,-72.2616 198.982,-68.372 182.662,-66.8559\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"175.564,-66.3138 182.784,-63.7061 179.054,-66.5804 182.544,-66.8469 182.544,-66.8469 182.544,-66.8469 179.054,-66.5804 182.304,-69.9878 175.564,-66.3138 175.564,-66.3138\"/>\n",
+        "<text text-anchor=\"start\" x=\"203\" y=\"-85.8\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;3 -->\n",
-        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M148.521,-66.0763C146.179,-76.3107 149.172,-86.1603 157.5,-86.1603 163.876,-86.1603 167.125,-80.3866 167.246,-73.0871\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"166.479,-66.0763 170.372,-72.6918 166.86,-69.5555 167.241,-73.0347 167.241,-73.0347 167.241,-73.0347 166.86,-69.5555 164.11,-73.3777 166.479,-66.0763 166.479,-66.0763\"/>\n",
-        "<text text-anchor=\"start\" x=\"144\" y=\"-89.9603\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
-        "</g>\n",
-        "<!-- 3&#45;&gt;4 -->\n",
-        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M175.601,-51.3981C191.679,-52.1201 216.301,-52.083 237,-47.1603 241.436,-46.1053 245.995,-44.4755 250.295,-42.6526\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"256.785,-39.6836 251.73,-45.4601 253.602,-41.1396 250.42,-42.5956 250.42,-42.5956 250.42,-42.5956 253.602,-41.1396 249.109,-39.7311 256.785,-39.6836 256.785,-39.6836\"/>\n",
-        "<text text-anchor=\"start\" x=\"196\" y=\"-54.9603\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
-        "</g>\n",
-        "<!-- 4&#45;&gt;3 -->\n",
-        "<g id=\"edge12\" class=\"edge\"><title>4&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M255.068,-27.6221C239.446,-25.0259 215.751,-22.7942 196,-28.1603 189.927,-29.8102 183.832,-32.719 178.374,-35.8916\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"172.298,-39.6776 176.573,-33.3021 175.268,-37.8266 178.239,-35.9756 178.239,-35.9756 178.239,-35.9756 175.268,-37.8266 179.905,-38.649 172.298,-39.6776 172.298,-39.6776\"/>\n",
-        "<text text-anchor=\"start\" x=\"203\" y=\"-31.9603\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
+        "<g id=\"edge12\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M263.425,-138.541C260.73,-148.909 263.922,-159 273,-159 279.95,-159 283.45,-153.085 283.499,-145.659\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"282.575,-138.541 286.6,-145.077 283.026,-142.012 283.477,-145.483 283.477,-145.483 283.477,-145.483 283.026,-142.012 280.353,-145.889 282.575,-138.541 282.575,-138.541\"/>\n",
+        "<text text-anchor=\"start\" x=\"252.5\" y=\"-162.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;4 -->\n",
         "<g id=\"edge13\" class=\"edge\"><title>4&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M263.425,-46.7018C260.73,-57.069 263.922,-67.1603 273,-67.1603 279.95,-67.1603 283.45,-61.245 283.499,-53.8194\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"282.575,-46.7018 286.6,-53.2374 283.026,-50.1726 283.477,-53.6434 283.477,-53.6434 283.477,-53.6434 283.026,-50.1726 280.353,-54.0493 282.575,-46.7018 282.575,-46.7018\"/>\n",
-        "<text text-anchor=\"start\" x=\"252.5\" y=\"-70.9603\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M263.425,-33.5414C260.73,-43.9087 263.922,-54 273,-54 279.95,-54 283.45,-48.0847 283.499,-40.6591\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"282.575,-33.5414 286.6,-40.0771 283.026,-37.0123 283.477,-40.4831 283.477,-40.4831 283.477,-40.4831 283.026,-37.0123 280.353,-40.889 282.575,-33.5414 282.575,-33.5414\"/>\n",
+        "<text text-anchor=\"start\" x=\"252.5\" y=\"-72.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<text text-anchor=\"start\" x=\"265\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4510> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816a9f0> >"
        ]
       }
      ],
@@ -1214,69 +1214,69 @@
         "<title>G</title>\n",
         "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-223 161,-223 161,4 -4,4\"/>\n",
         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node2\" class=\"node\"><title>1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-97\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-93.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
-        "<!-- I&#45;&gt;1 -->\n",
-        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-97C2.79388,-97 17.1543,-97 30.6317,-97\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-97 30.9419,-100.15 34.4419,-97 30.9419,-97.0001 30.9419,-97.0001 30.9419,-97.0001 34.4419,-97 30.9418,-93.8501 37.9419,-97 37.9419,-97\"/>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-114.037C48.3189,-123.858 50.4453,-133 56,-133 60.166,-133 62.4036,-127.858 62.7128,-121.143\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-114.037 65.8541,-120.882 62.5434,-117.533 62.7076,-121.03 62.7076,-121.03 62.7076,-121.03 62.5434,-117.533 59.561,-121.177 62.3792,-114.037 62.3792,-114.037\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-136.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
         "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"139\" cy=\"-153\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"139\" y=\"-149.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-77\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-73.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M71.4812,-107.012C84.3818,-115.931 103.39,-129.072 117.788,-139.026\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"123.644,-143.075 116.095,-141.685 120.765,-141.085 117.886,-139.094 117.886,-139.094 117.886,-139.094 120.765,-141.085 119.678,-136.503 123.644,-143.075 123.644,-143.075\"/>\n",
-        "<text text-anchor=\"start\" x=\"92\" y=\"-131.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-77C2.79388,-77 17.1543,-77 30.6317,-77\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-77 30.9419,-80.1501 34.4419,-77 30.9419,-77.0001 30.9419,-77.0001 30.9419,-77.0001 34.4419,-77 30.9418,-73.8501 37.9419,-77 37.9419,-77\"/>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;0 -->\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-94.0373C48.3189,-103.858 50.4453,-113 56,-113 60.166,-113 62.4036,-107.858 62.7128,-101.143\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-94.0373 65.8541,-100.882 62.5434,-97.5335 62.7076,-101.03 62.7076,-101.03 62.7076,-101.03 62.5434,-97.5335 59.561,-101.177 62.3792,-94.0373 62.3792,-94.0373\"/>\n",
+        "<text text-anchor=\"start\" x=\"51.5\" y=\"-116.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"139\" cy=\"-120\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"start\" x=\"134.5\" y=\"-116.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M72.2355,-85.088C84.6805,-91.6946 102.425,-101.114 116.346,-108.505\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"122.833,-111.948 115.173,-111.448 119.741,-110.307 116.65,-108.666 116.65,-108.666 116.65,-108.666 119.741,-110.307 118.127,-105.884 122.833,-111.948 122.833,-111.948\"/>\n",
+        "<text text-anchor=\"start\" x=\"93\" y=\"-104.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
         "</g>\n",
         "<!-- 2 -->\n",
         "<g id=\"node4\" class=\"node\"><title>2</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"139\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
         "<text text-anchor=\"middle\" x=\"139\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M69.6562,-84.6562C83.209,-71.4381 104.825,-50.3563 120.113,-35.4454\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"125.433,-30.2571 122.621,-37.3997 122.927,-32.7008 120.421,-35.1446 120.421,-35.1446 120.421,-35.1446 122.927,-32.7008 118.222,-32.8895 125.433,-30.2571 125.433,-30.2571\"/>\n",
-        "<text text-anchor=\"start\" x=\"93\" y=\"-65.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M71.1091,-66.723C84.1178,-57.2476 103.56,-43.0856 118.137,-32.4684\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"124.053,-28.1592 120.249,-34.8268 121.223,-30.2199 118.394,-32.2806 118.394,-32.2806 118.394,-32.2806 121.223,-30.2199 116.54,-29.7345 124.053,-28.1592 124.053,-28.1592\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-54.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M131.969,-169.664C130.406,-179.625 132.75,-189 139,-189 143.688,-189 146.178,-183.727 146.471,-176.888\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"146.031,-169.664 149.601,-176.46 146.244,-173.158 146.456,-176.651 146.456,-176.651 146.456,-176.651 146.244,-173.158 143.312,-176.842 146.031,-169.664 146.031,-169.664\"/>\n",
-        "<text text-anchor=\"start\" x=\"133.5\" y=\"-207.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
-        "<text text-anchor=\"start\" x=\"131\" y=\"-192.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M135.405,-137.782C134.794,-147.315 135.992,-156 139,-156 141.209,-156 142.442,-151.316 142.699,-145.052\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"142.595,-137.782 145.845,-144.736 142.645,-141.281 142.695,-144.781 142.695,-144.781 142.695,-144.781 142.645,-141.281 139.546,-144.826 142.595,-137.782 142.595,-137.782\"/>\n",
+        "<text text-anchor=\"start\" x=\"134.5\" y=\"-174.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
+        "<text text-anchor=\"start\" x=\"131\" y=\"-159.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M135.405,-35.7817C134.794,-45.3149 135.992,-54 139,-54 141.209,-54 142.442,-49.3161 142.699,-43.0521\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"142.595,-35.7817 145.845,-42.736 142.645,-39.2814 142.695,-42.781 142.695,-42.781 142.695,-42.781 142.645,-39.2814 139.546,-42.8261 142.595,-35.7817 142.595,-35.7817\"/>\n",
-        "<text text-anchor=\"start\" x=\"134.5\" y=\"-72.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
-        "<text text-anchor=\"start\" x=\"131\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M133.494,-137.249C129.587,-158.435 131.422,-186 139,-186 145.749,-186 147.943,-164.135 145.582,-144.385\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"144.506,-137.249 148.665,-143.701 145.028,-140.71 145.55,-144.171 145.55,-144.171 145.55,-144.171 145.028,-140.71 142.435,-144.64 144.506,-137.249 144.506,-137.249\"/>\n",
+        "<text text-anchor=\"start\" x=\"132.5\" y=\"-189.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;2 -->\n",
         "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M133.494,-35.249C129.587,-56.4346 131.422,-84 139,-84 145.749,-84 147.943,-62.1347 145.582,-42.3851\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"144.506,-35.249 148.665,-41.7011 145.028,-38.7099 145.55,-42.1708 145.55,-42.1708 145.55,-42.1708 145.028,-38.7099 142.435,-42.6405 144.506,-35.249 144.506,-35.249\"/>\n",
-        "<text text-anchor=\"start\" x=\"132.5\" y=\"-87.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M131.969,-34.6641C130.406,-44.625 132.75,-54 139,-54 143.688,-54 146.178,-48.7266 146.471,-41.8876\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"146.031,-34.6641 149.601,-41.4598 146.244,-38.1576 146.456,-41.6511 146.456,-41.6511 146.456,-41.6511 146.244,-38.1576 143.312,-41.8425 146.031,-34.6641 146.031,-34.6641\"/>\n",
+        "<text text-anchor=\"start\" x=\"133.5\" y=\"-72.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "<text text-anchor=\"start\" x=\"131\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4540> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816a870> >"
        ]
       }
      ],
@@ -1334,67 +1334,67 @@
         "<!-- 1 -->\n",
         "<g id=\"node3\" class=\"node\"><title>1</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"143\" cy=\"-113\" rx=\"18\" ry=\"18\"/>\n",
-        "<ellipse fill=\"none\" stroke=\"black\" cx=\"143\" cy=\"-113\" rx=\"22\" ry=\"22\"/>\n",
         "<text text-anchor=\"start\" x=\"138.5\" y=\"-109.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
         "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M72.5903,-80.3366C84.6994,-86.035 101.76,-94.0634 115.936,-100.735\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"122.629,-103.884 114.954,-103.754 119.462,-102.394 116.295,-100.904 116.295,-100.904 116.295,-100.904 119.462,-102.394 117.637,-98.0535 122.629,-103.884 122.629,-103.884\"/>\n",
-        "<text text-anchor=\"start\" x=\"92\" y=\"-97.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M72.5903,-80.3366C85.8901,-86.5954 105.163,-95.6648 120.027,-102.66\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"126.509,-105.71 118.834,-105.579 123.342,-104.22 120.175,-102.729 120.175,-102.729 120.175,-102.729 123.342,-104.22 121.516,-99.8791 126.509,-105.71 126.509,-105.71\"/>\n",
+        "<text text-anchor=\"start\" x=\"93\" y=\"-97.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
         "</g>\n",
         "<!-- 2 -->\n",
         "<g id=\"node4\" class=\"node\"><title>2</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"143\" cy=\"-22\" rx=\"18\" ry=\"18\"/>\n",
+        "<ellipse fill=\"none\" stroke=\"black\" cx=\"143\" cy=\"-22\" rx=\"22\" ry=\"22\"/>\n",
         "<text text-anchor=\"middle\" x=\"143\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;2 -->\n",
         "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M71.8059,-64.1165C85.3737,-55.9758 105.611,-43.8333 120.875,-34.6748\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"127.079,-30.9528 122.697,-37.2555 124.077,-32.7536 121.076,-34.5544 121.076,-34.5544 121.076,-34.5544 124.077,-32.7536 119.455,-31.8532 127.079,-30.9528 127.079,-30.9528\"/>\n",
-        "<text text-anchor=\"start\" x=\"93\" y=\"-53.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M71.8059,-64.1165C84.458,-56.5252 102.91,-45.4539 117.721,-36.5676\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"123.818,-32.9095 119.436,-39.2121 120.816,-34.7102 117.815,-36.511 117.815,-36.511 117.815,-36.511 120.816,-34.7102 116.194,-33.8099 123.818,-32.9095 123.818,-32.9095\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-54.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;1 -->\n",
         "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M134.994,-133.581C133.886,-143.845 136.555,-153 143,-153 147.834,-153 150.544,-147.85 151.129,-140.945\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"151.006,-133.581 154.273,-140.527 151.065,-137.08 151.123,-140.58 151.123,-140.58 151.123,-140.58 151.065,-137.08 147.973,-140.632 151.006,-133.581 151.006,-133.581\"/>\n",
-        "<text text-anchor=\"start\" x=\"137.5\" y=\"-156.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
-        "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M135.332,-38.2903C133.483,-48.3892 136.039,-58 143,-58 148.221,-58 150.964,-52.5939 151.229,-45.6304\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"150.668,-38.2903 154.342,-45.0299 150.935,-41.7801 151.201,-45.2699 151.201,-45.2699 151.201,-45.2699 150.935,-41.7801 148.06,-45.5099 150.668,-38.2903 150.668,-38.2903\"/>\n",
-        "<text text-anchor=\"start\" x=\"136.5\" y=\"-61.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M135.332,-129.29C133.483,-139.389 136.039,-149 143,-149 148.221,-149 150.964,-143.594 151.229,-136.63\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"150.668,-129.29 154.342,-136.03 150.935,-132.78 151.201,-136.27 151.201,-136.27 151.201,-136.27 150.935,-132.78 148.06,-136.51 150.668,-129.29 150.668,-129.29\"/>\n",
+        "<text text-anchor=\"start\" x=\"136.5\" y=\"-152.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
         "</g>\n",
         "<!-- 3 -->\n",
         "<g id=\"node5\" class=\"node\"><title>3</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"236\" cy=\"-22\" rx=\"18\" ry=\"18\"/>\n",
-        "<ellipse fill=\"none\" stroke=\"black\" cx=\"236\" cy=\"-22\" rx=\"22\" ry=\"22\"/>\n",
-        "<text text-anchor=\"middle\" x=\"236\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"236\" cy=\"-113\" rx=\"18\" ry=\"18\"/>\n",
+        "<ellipse fill=\"none\" stroke=\"black\" cx=\"236\" cy=\"-113\" rx=\"22\" ry=\"22\"/>\n",
+        "<text text-anchor=\"middle\" x=\"236\" y=\"-109.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;3 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M161.116,-22C173.948,-22 191.793,-22 206.731,-22\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"213.796,-22 206.796,-25.1501 210.296,-22 206.796,-22.0001 206.796,-22.0001 206.796,-22.0001 210.296,-22 206.795,-18.8501 213.796,-22 213.796,-22\"/>\n",
-        "<text text-anchor=\"start\" x=\"185\" y=\"-25.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
+        "<!-- 1&#45;&gt;3 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M161.116,-113C173.948,-113 191.793,-113 206.731,-113\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"213.796,-113 206.796,-116.15 210.296,-113 206.796,-113 206.796,-113 206.796,-113 210.296,-113 206.795,-109.85 213.796,-113 213.796,-113\"/>\n",
+        "<text text-anchor=\"start\" x=\"185\" y=\"-116.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;2 -->\n",
-        "<g id=\"edge8\" class=\"edge\"><title>3&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M217.045,-9.91849C207.177,-4.69562 194.613,-0.32156 183,-3 176.881,-4.41121 170.611,-6.91853 164.938,-9.6583\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"158.596,-12.9296 163.373,-6.92094 161.707,-11.325 164.817,-9.72043 164.817,-9.72043 164.817,-9.72043 161.707,-11.325 166.261,-12.5199 158.596,-12.9296 158.596,-12.9296\"/>\n",
-        "<text text-anchor=\"start\" x=\"183\" y=\"-6.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M134.994,-42.5808C133.886,-52.8447 136.555,-62 143,-62 147.834,-62 150.544,-56.8502 151.129,-49.9451\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"151.006,-42.5808 154.273,-49.5273 151.065,-46.0803 151.123,-49.5798 151.123,-49.5798 151.123,-49.5798 151.065,-46.0803 147.973,-49.6324 151.006,-42.5808 151.006,-42.5808\"/>\n",
+        "<text text-anchor=\"start\" x=\"137.5\" y=\"-65.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "</g>\n",
+        "<!-- 3&#45;&gt;1 -->\n",
+        "<g id=\"edge8\" class=\"edge\"><title>3&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M217.045,-100.918C207.177,-95.6956 194.613,-91.3216 183,-94 176.881,-95.4112 170.611,-97.9185 164.938,-100.658\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"158.596,-103.93 163.373,-97.9209 161.707,-102.325 164.817,-100.72 164.817,-100.72 164.817,-100.72 161.707,-102.325 166.261,-103.52 158.596,-103.93 158.596,-103.93\"/>\n",
+        "<text text-anchor=\"start\" x=\"183\" y=\"-97.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;3 -->\n",
         "<g id=\"edge9\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M227.63,-42.5808C226.472,-52.8447 229.262,-62 236,-62 241.054,-62 243.887,-56.8502 244.499,-49.9451\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"244.37,-42.5808 247.642,-49.5248 244.431,-46.0803 244.492,-49.5797 244.492,-49.5797 244.492,-49.5797 244.431,-46.0803 241.343,-49.6347 244.37,-42.5808 244.37,-42.5808\"/>\n",
-        "<text text-anchor=\"start\" x=\"231.5\" y=\"-65.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M227.63,-133.581C226.472,-143.845 229.262,-153 236,-153 241.054,-153 243.887,-147.85 244.499,-140.945\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"244.37,-133.581 247.642,-140.525 244.431,-137.08 244.492,-140.58 244.492,-140.58 244.492,-140.58 244.431,-137.08 241.343,-140.635 244.37,-133.581 244.37,-133.581\"/>\n",
+        "<text text-anchor=\"start\" x=\"231.5\" y=\"-156.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4570> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816a690> >"
        ]
       }
      ],
@@ -1493,7 +1493,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da43c0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816a6f0> >"
        ]
       }
      ],
@@ -1963,7 +1963,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4150> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816a3f0> >"
        ]
       }
      ],
@@ -2292,136 +2292,136 @@
        "metadata": {},
        "output_type": "display_data",
        "svg": [
-        "<svg height=\"193pt\" viewBox=\"0.00 0.00 491.00 193.31\" width=\"491pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 189.31)\">\n",
+        "<svg height=\"202pt\" viewBox=\"0.00 0.00 491.00 202.00\" width=\"491pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 198)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" points=\"-4,4 -4,-189.31 487,-189.31 487,4 -4,4\" stroke=\"none\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"220.5\" y=\"-171.11\">Inf(</text>\n",
-        "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"242.5\" y=\"-171.11\">\u24ff</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"258.5\" y=\"-171.11\">)</text>\n",
+        "<polygon fill=\"white\" points=\"-4,4 -4,-198 487,-198 487,4 -4,4\" stroke=\"none\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"220.5\" y=\"-179.8\">Inf(</text>\n",
+        "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"242.5\" y=\"-179.8\">\u24ff</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"258.5\" y=\"-179.8\">)</text>\n",
         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g class=\"node\" id=\"node2\"><title>1</title>\n",
-        "<ellipse cx=\"56\" cy=\"-39.31\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"56\" y=\"-35.61\">1</text>\n",
-        "</g>\n",
-        "<!-- I&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge1\"><title>I-&gt;1</title>\n",
-        "<path d=\"M1.15491,-39.31C2.79388,-39.31 17.1543,-39.31 30.6317,-39.31\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"37.9419,-39.31 30.9419,-42.4601 34.4419,-39.31 30.9419,-39.3101 30.9419,-39.3101 30.9419,-39.3101 34.4419,-39.31 30.9418,-36.1601 37.9419,-39.31 37.9419,-39.31\" stroke=\"black\"/>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge4\"><title>1-&gt;1</title>\n",
-        "<path d=\"M49.6208,-56.3473C48.3189,-66.1679 50.4453,-75.31 56,-75.31 60.166,-75.31 62.4036,-70.1675 62.7128,-63.4533\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"62.3792,-56.3473 65.8541,-63.1918 62.5434,-59.8434 62.7076,-63.3396 62.7076,-63.3396 62.7076,-63.3396 62.5434,-59.8434 59.561,-63.4873 62.3792,-56.3473 62.3792,-56.3473\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"56\" y=\"-79.11\">1</text>\n",
-        "</g>\n",
-        "<!-- 2 -->\n",
-        "<g class=\"node\" id=\"node5\"><title>2</title>\n",
-        "<ellipse cx=\"144\" cy=\"-94.31\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"144\" y=\"-90.61\">2</text>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge5\"><title>1-&gt;2</title>\n",
-        "<path d=\"M68.7319,-52.3683C75.1386,-58.9554 83.4866,-66.7125 92,-72.31 100.604,-77.9668 110.903,-82.7322 119.987,-86.3656\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"126.648,-88.9195 118.984,-89.3547 123.38,-87.6665 120.112,-86.4135 120.112,-86.4135 120.112,-86.4135 123.38,-87.6665 121.239,-83.4723 126.648,-88.9195 126.648,-88.9195\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"96.5\" y=\"-99.11\">a</text>\n",
-        "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"92\" y=\"-84.11\">\u24ff</text>\n",
-        "</g>\n",
-        "<!-- 3 -->\n",
-        "<g class=\"node\" id=\"node6\"><title>3</title>\n",
-        "<ellipse cx=\"253\" cy=\"-29.31\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"253\" y=\"-25.61\">3</text>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge6\"><title>1-&gt;3</title>\n",
-        "<path d=\"M74.3049,-38.4225C109.084,-36.639 187.544,-32.6154 227.548,-30.5639\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"235.012,-30.1811 228.183,-33.6856 231.517,-30.3604 228.021,-30.5397 228.021,-30.5397 228.021,-30.5397 231.517,-30.3604 227.86,-27.3939 235.012,-30.1811 235.012,-30.1811\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"138.5\" y=\"-39.11\">!a</text>\n",
-        "</g>\n",
         "<!-- 0 -->\n",
-        "<g class=\"node\" id=\"node3\"><title>0</title>\n",
-        "<ellipse cx=\"366\" cy=\"-45.31\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"366\" y=\"-41.61\">0</text>\n",
+        "<g class=\"node\" id=\"node2\"><title>0</title>\n",
+        "<ellipse cx=\"56\" cy=\"-63\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"56\" y=\"-59.3\">0</text>\n",
+        "</g>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g class=\"edge\" id=\"edge1\"><title>I-&gt;0</title>\n",
+        "<path d=\"M1.15491,-63C2.79388,-63 17.1543,-63 30.6317,-63\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"37.9419,-63 30.9419,-66.1501 34.4419,-63 30.9419,-63.0001 30.9419,-63.0001 30.9419,-63.0001 34.4419,-63 30.9418,-59.8501 37.9419,-63 37.9419,-63\" stroke=\"black\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
         "<g class=\"edge\" id=\"edge2\"><title>0-&gt;0</title>\n",
-        "<path d=\"M357.635,-61.6002C355.618,-71.6991 358.406,-81.31 366,-81.31 371.695,-81.31 374.688,-75.9039 374.977,-68.9403\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"374.365,-61.6002 378.086,-68.3144 374.656,-65.0881 374.947,-68.576 374.947,-68.576 374.947,-68.576 374.656,-65.0881 371.807,-68.8377 374.365,-61.6002 374.365,-61.6002\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"345.5\" y=\"-100.11\">!a &amp; !b</text>\n",
-        "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"358\" y=\"-85.11\">\u24ff</text>\n",
+        "<path d=\"M49.6208,-80.0373C48.3189,-89.8579 50.4453,-99 56,-99 60.166,-99 62.4036,-93.8576 62.7128,-87.1433\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"62.3792,-80.0373 65.8541,-86.8818 62.5434,-83.5335 62.7076,-87.0296 62.7076,-87.0296 62.7076,-87.0296 62.5434,-83.5335 59.561,-87.1774 62.3792,-80.0373 62.3792,-80.0373\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"51.5\" y=\"-102.8\">1</text>\n",
+        "</g>\n",
+        "<!-- 1 -->\n",
+        "<g class=\"node\" id=\"node3\"><title>1</title>\n",
+        "<ellipse cx=\"144\" cy=\"-118\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"139.5\" y=\"-114.3\">1</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;1</title>\n",
+        "<path d=\"M68.7319,-76.0584C75.1386,-82.6454 83.4866,-90.4025 92,-96 100.604,-101.657 110.903,-106.422 119.987,-110.056\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"126.648,-112.61 118.984,-113.045 123.38,-111.357 120.112,-110.104 120.112,-110.104 120.112,-110.104 123.38,-111.357 121.239,-107.162 126.648,-112.61 126.648,-112.61\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"96.5\" y=\"-122.8\">a</text>\n",
+        "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"92\" y=\"-107.8\">\u24ff</text>\n",
+        "</g>\n",
+        "<!-- 2 -->\n",
+        "<g class=\"node\" id=\"node4\"><title>2</title>\n",
+        "<ellipse cx=\"253\" cy=\"-63\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"253\" y=\"-59.3\">2</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge4\"><title>0-&gt;2</title>\n",
+        "<path d=\"M74.3049,-63C108.997,-63 187.15,-63 227.246,-63\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"234.734,-63 227.734,-66.1501 231.234,-63 227.734,-63.0001 227.734,-63.0001 227.734,-63.0001 231.234,-63 227.734,-59.8501 234.734,-63 234.734,-63\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"138.5\" y=\"-66.8\">!a</text>\n",
+        "</g>\n",
+        "<!-- 1&#45;&gt;0 -->\n",
+        "<g class=\"edge\" id=\"edge5\"><title>1-&gt;0</title>\n",
+        "<path d=\"M133.659,-103.124C127.406,-94.3189 118.427,-83.6253 108,-77 99.9283,-71.8712 89.9824,-68.5983 81.0235,-66.5201\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"74.105,-65.097 81.5961,-63.422 77.5332,-65.8022 80.9614,-66.5074 80.9614,-66.5074 80.9614,-66.5074 77.5332,-65.8022 80.3267,-69.5928 74.105,-65.097 74.105,-65.097\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"95.5\" y=\"-80.8\">b</text>\n",
+        "</g>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g class=\"edge\" id=\"edge6\"><title>1-&gt;1</title>\n",
+        "<path d=\"M136.332,-134.29C134.483,-144.389 137.039,-154 144,-154 149.221,-154 151.964,-148.594 152.229,-141.63\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"151.668,-134.29 155.342,-141.03 151.935,-137.78 152.201,-141.27 152.201,-141.27 152.201,-141.27 151.935,-137.78 149.06,-141.51 151.668,-134.29 151.668,-134.29\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"127\" y=\"-157.8\">a &amp; b</text>\n",
+        "</g>\n",
+        "<!-- 1&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge7\"><title>1-&gt;2</title>\n",
+        "<path d=\"M155.172,-103.784C161.479,-95.9626 170.229,-86.7126 180,-81 194.587,-72.4715 213.123,-67.9572 227.735,-65.5825\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"234.976,-64.5257 228.504,-68.6536 231.513,-65.0312 228.049,-65.5366 228.049,-65.5366 228.049,-65.5366 231.513,-65.0312 227.594,-62.4196 234.976,-64.5257 234.976,-64.5257\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"180\" y=\"-99.8\">!a &amp; b</text>\n",
+        "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"190.5\" y=\"-84.8\">\u24ff</text>\n",
         "</g>\n",
         "<!-- 4 -->\n",
-        "<g class=\"node\" id=\"node4\"><title>4</title>\n",
-        "<ellipse cx=\"465\" cy=\"-45.31\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"465\" y=\"-41.61\">4</text>\n",
+        "<g class=\"node\" id=\"node5\"><title>4</title>\n",
+        "<ellipse cx=\"465\" cy=\"-120\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"465\" y=\"-116.3\">4</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;4</title>\n",
-        "<path d=\"M384.342,-45.31C399.791,-45.31 422.554,-45.31 439.795,-45.31\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"446.808,-45.31 439.809,-48.4601 443.308,-45.31 439.808,-45.3101 439.808,-45.3101 439.808,-45.3101 443.308,-45.31 439.808,-42.1601 446.808,-45.31 446.808,-45.31\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"402\" y=\"-49.11\">a | b</text>\n",
+        "<!-- 1&#45;&gt;4 -->\n",
+        "<g class=\"edge\" id=\"edge8\"><title>1-&gt;4</title>\n",
+        "<path d=\"M158.837,-128.67C164.97,-132.749 172.488,-136.919 180,-139 195.848,-143.39 200.567,-139.619 217,-139 298.865,-135.915 395.651,-126.902 439.831,-122.49\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"446.957,-121.773 440.308,-125.608 443.475,-122.124 439.993,-122.474 439.993,-122.474 439.993,-122.474 443.475,-122.124 439.677,-119.34 446.957,-121.773 446.957,-121.773\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"303\" y=\"-138.8\">!b</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;0 -->\n",
+        "<g class=\"edge\" id=\"edge9\"><title>2-&gt;0</title>\n",
+        "<path d=\"M235.712,-57.5603C211.723,-50.2264 165.461,-38.6662 126,-44 110.416,-46.1064 93.3766,-50.7739 80.1294,-54.9554\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"73.1933,-57.2091 78.8773,-52.0501 76.522,-56.1275 79.8507,-55.0459 79.8507,-55.0459 79.8507,-55.0459 76.522,-56.1275 80.8242,-58.0417 73.1933,-57.2091 73.1933,-57.2091\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"137.5\" y=\"-47.8\">!b</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;1 -->\n",
+        "<g class=\"edge\" id=\"edge10\"><title>2-&gt;1</title>\n",
+        "<path d=\"M244.677,-79.2247C238.831,-90.1559 229.539,-103.84 217,-111 202.605,-119.22 183.913,-120.824 169.183,-120.45\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"161.885,-120.099 169.028,-117.289 165.38,-120.267 168.876,-120.435 168.876,-120.435 168.876,-120.435 165.38,-120.267 168.725,-123.582 161.885,-120.099 161.885,-120.099\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"180\" y=\"-123.8\">a &amp; !b</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge11\"><title>2-&gt;2</title>\n",
+        "<path d=\"M243.767,-78.5414C241.169,-88.9087 244.246,-99 253,-99 259.702,-99 263.077,-93.0847 263.124,-85.6591\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"262.233,-78.5414 266.229,-85.0955 262.668,-82.0143 263.103,-85.4871 263.103,-85.4871 263.103,-85.4871 262.668,-82.0143 259.977,-85.8788 262.233,-78.5414 262.233,-78.5414\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"232.5\" y=\"-102.8\">!a &amp; !b</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;4 -->\n",
+        "<g class=\"edge\" id=\"edge13\"><title>2-&gt;4</title>\n",
+        "<path d=\"M270.184,-68.6018C288.821,-74.9506 320.42,-85.4023 348,-93 379.615,-101.709 416.578,-109.99 440.129,-115.03\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"446.987,-116.488 439.485,-118.114 443.564,-115.76 440.14,-115.033 440.14,-115.033 440.14,-115.033 443.564,-115.76 440.795,-111.951 446.987,-116.488 446.987,-116.488\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"361.5\" y=\"-105.8\">b</text>\n",
+        "</g>\n",
+        "<!-- 3 -->\n",
+        "<g class=\"node\" id=\"node6\"><title>3</title>\n",
+        "<ellipse cx=\"366\" cy=\"-18\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"366\" y=\"-14.3\">3</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;3 -->\n",
+        "<g class=\"edge\" id=\"edge12\"><title>2-&gt;3</title>\n",
+        "<path d=\"M269.904,-56.5526C288.944,-48.8335 320.958,-35.8548 342.522,-27.1128\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"349.126,-24.4354 343.822,-29.9847 345.882,-25.7504 342.639,-27.0654 342.639,-27.0654 342.639,-27.0654 345.882,-25.7504 341.455,-24.1462 349.126,-24.4354 349.126,-24.4354\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"289\" y=\"-51.8\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;4 -->\n",
         "<g class=\"edge\" id=\"edge16\"><title>4-&gt;4</title>\n",
-        "<path d=\"M456.635,-61.6002C454.618,-71.6991 457.406,-81.31 465,-81.31 470.695,-81.31 473.688,-75.9039 473.977,-68.9403\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"473.365,-61.6002 477.086,-68.3144 473.656,-65.0881 473.947,-68.576 473.947,-68.576 473.947,-68.576 473.656,-65.0881 470.807,-68.8377 473.365,-61.6002 473.365,-61.6002\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"465\" y=\"-85.11\">1</text>\n",
-        "</g>\n",
-        "<!-- 2&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge7\"><title>2-&gt;1</title>\n",
-        "<path d=\"M133.659,-79.4339C127.406,-70.6289 118.427,-59.9353 108,-53.31 99.9283,-48.1812 89.9824,-44.9083 81.0235,-42.8301\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"74.105,-41.407 81.5961,-39.732 77.5332,-42.1122 80.9614,-42.8174 80.9614,-42.8174 80.9614,-42.8174 77.5332,-42.1122 80.3267,-45.9028 74.105,-41.407 74.105,-41.407\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"95.5\" y=\"-57.11\">b</text>\n",
-        "</g>\n",
-        "<!-- 2&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge10\"><title>2-&gt;4</title>\n",
-        "<path d=\"M157.074,-106.842C163.323,-112.423 171.429,-118.388 180,-121.31 218.487,-134.43 239.141,-178.096 384,-120.31 411.643,-109.283 435.358,-83.7555 449.633,-65.5495\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"454.105,-59.6875 452.364,-67.1636 451.982,-62.4703 449.859,-65.2531 449.859,-65.2531 449.859,-65.2531 451.982,-62.4703 447.355,-63.3427 454.105,-59.6875 454.105,-59.6875\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"303\" y=\"-151.11\">!b</text>\n",
-        "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge8\"><title>2-&gt;2</title>\n",
-        "<path d=\"M136.332,-110.6C134.483,-120.699 137.039,-130.31 144,-130.31 149.221,-130.31 151.964,-124.904 152.229,-117.94\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"151.668,-110.6 155.342,-117.34 151.935,-114.09 152.201,-117.58 152.201,-117.58 152.201,-117.58 151.935,-114.09 149.06,-117.82 151.668,-110.6 151.668,-110.6\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"127\" y=\"-134.11\">a &amp; b</text>\n",
-        "</g>\n",
-        "<!-- 2&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge9\"><title>2-&gt;3</title>\n",
-        "<path d=\"M161.928,-92.0185C177.341,-89.2964 200.189,-83.6164 217,-72.31 225.529,-66.5738 233.032,-58.1415 238.882,-50.2604\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"243.022,-44.3948 241.559,-51.9302 241.003,-47.2543 238.985,-50.1137 238.985,-50.1137 238.985,-50.1137 241.003,-47.2543 236.412,-48.2972 243.022,-44.3948 243.022,-44.3948\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"180\" y=\"-106.11\">!a &amp; b</text>\n",
-        "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"190.5\" y=\"-91.11\">\u24ff</text>\n",
-        "</g>\n",
-        "<!-- 3&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge12\"><title>3-&gt;1</title>\n",
-        "<path d=\"M235.605,-24.3158C211.482,-17.6543 165.056,-7.45277 126,-14.31 109.757,-17.1619 92.2994,-23.521 79.0084,-29.1117\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"72.4663,-31.9426 77.6396,-26.2716 75.6785,-30.5526 78.8906,-29.1626 78.8906,-29.1626 78.8906,-29.1626 75.6785,-30.5526 80.1416,-32.0535 72.4663,-31.9426 72.4663,-31.9426\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"137.5\" y=\"-18.11\">!b</text>\n",
-        "</g>\n",
-        "<!-- 3&#45;&gt;0 -->\n",
-        "<g class=\"edge\" id=\"edge11\"><title>3-&gt;0</title>\n",
-        "<path d=\"M270.859,-31.74C289.521,-34.4301 319.756,-38.7883 340.912,-41.8378\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"347.983,-42.857 340.605,-44.976 344.519,-42.3577 341.054,-41.8583 341.054,-41.8583 341.054,-41.8583 344.519,-42.3577 341.504,-38.7405 347.983,-42.857 347.983,-42.857\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"289\" y=\"-43.11\">!a &amp; !b</text>\n",
+        "<path d=\"M456.635,-136.29C454.618,-146.389 457.406,-156 465,-156 470.695,-156 473.688,-150.594 473.977,-143.63\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"473.365,-136.29 477.086,-143.004 473.656,-139.778 473.947,-143.266 473.947,-143.266 473.947,-143.266 473.656,-139.778 470.807,-143.528 473.365,-136.29 473.365,-136.29\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"460.5\" y=\"-159.8\">1</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;4 -->\n",
         "<g class=\"edge\" id=\"edge15\"><title>3-&gt;4</title>\n",
-        "<path d=\"M269.708,-21.7136C294.247,-10.8458 343.105,6.77258 384,-3.30996 405.723,-8.66554 428.072,-21.0901 443.607,-31.0447\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"449.826,-35.1319 442.247,-33.9197 446.901,-33.2096 443.977,-31.2873 443.977,-31.2873 443.977,-31.2873 446.901,-33.2096 445.707,-28.6549 449.826,-35.1319 449.826,-35.1319\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"361.5\" y=\"-7.10996\">b</text>\n",
-        "</g>\n",
-        "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge13\"><title>3-&gt;2</title>\n",
-        "<path d=\"M235.13,-32.24C219.759,-35.5063 196.937,-41.8971 180,-53.31 171.996,-58.7034 164.761,-66.4047 158.974,-73.6794\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"154.469,-79.6297 156.183,-72.1474 156.582,-76.8393 158.695,-74.049 158.695,-74.049 158.695,-74.049 156.582,-76.8393 161.206,-75.9505 154.469,-79.6297 154.469,-79.6297\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"180\" y=\"-57.11\">a &amp; !b</text>\n",
+        "<path d=\"M379.285,-30.9184C396.413,-48.9291 427.541,-81.6613 446.919,-102.039\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"451.815,-107.187 444.708,-104.285 449.403,-104.65 446.991,-102.114 446.991,-102.114 446.991,-102.114 449.403,-104.65 449.273,-99.9432 451.815,-107.187 451.815,-107.187\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"402\" y=\"-84.8\">a | b</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;3 -->\n",
         "<g class=\"edge\" id=\"edge14\"><title>3-&gt;3</title>\n",
-        "<path d=\"M243.767,-44.8514C241.169,-55.2187 244.246,-65.31 253,-65.31 259.702,-65.31 263.077,-59.3946 263.124,-51.969\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"262.233,-44.8514 266.229,-51.4054 262.668,-48.3243 263.103,-51.7971 263.103,-51.7971 263.103,-51.7971 262.668,-48.3243 259.977,-52.1888 262.233,-44.8514 262.233,-44.8514\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"232.5\" y=\"-69.11\">!a &amp; !b</text>\n",
+        "<path d=\"M357.635,-34.2903C355.618,-44.3892 358.406,-54 366,-54 371.695,-54 374.688,-48.5939 374.977,-41.6304\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"374.365,-34.2903 378.086,-41.0044 374.656,-37.7782 374.947,-41.2661 374.947,-41.2661 374.947,-41.2661 374.656,-37.7782 371.807,-41.5278 374.365,-34.2903 374.365,-34.2903\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"345.5\" y=\"-72.8\">!a &amp; !b</text>\n",
+        "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"358\" y=\"-57.8\">\u24ff</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>"
@@ -2440,145 +2440,145 @@
         "<!-- Generated by graphviz version 2.38.0 (20140413.2041)\n",
         " -->\n",
         "<!-- Title: G Pages: 1 -->\n",
-        "<svg width=\"527pt\" height=\"185pt\"\n",
-        " viewBox=\"0.00 0.00 527.00 185.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 181)\">\n",
+        "<svg width=\"527pt\" height=\"179pt\"\n",
+        " viewBox=\"0.00 0.00 527.00 179.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 175)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-181 523,-181 523,4 -4,4\"/>\n",
+        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-175 523,-175 523,4 -4,4\"/>\n",
         "<!-- I -->\n",
-        "<!-- 2 -->\n",
-        "<g id=\"node2\" class=\"node\"><title>2</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-108\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-104.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
-        "</g>\n",
-        "<!-- I&#45;&gt;2 -->\n",
-        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-108C2.79388,-108 17.1543,-108 30.6317,-108\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-108 30.9419,-111.15 34.4419,-108 30.9419,-108 30.9419,-108 30.9419,-108 34.4419,-108 30.9418,-104.85 37.9419,-108 37.9419,-108\"/>\n",
-        "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-125.037C48.3189,-134.858 50.4453,-144 56,-144 60.166,-144 62.4036,-138.858 62.7128,-132.143\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-125.037 65.8541,-131.882 62.5434,-128.533 62.7076,-132.03 62.7076,-132.03 62.7076,-132.03 62.5434,-128.533 59.561,-132.177 62.3792,-125.037 62.3792,-125.037\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-147.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
         "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"141\" cy=\"-155\" rx=\"18\" ry=\"18\"/>\n",
-        "<ellipse fill=\"none\" stroke=\"black\" cx=\"141\" cy=\"-155\" rx=\"22\" ry=\"22\"/>\n",
-        "<text text-anchor=\"middle\" x=\"141\" y=\"-151.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-66\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-62.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;0 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>2&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M68.4614,-121.499C74.7941,-128.206 83.1575,-135.938 92,-141 98.0857,-144.484 105.11,-147.163 111.875,-149.198\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"119.057,-151.162 111.474,-152.354 115.681,-150.239 112.305,-149.316 112.305,-149.316 112.305,-149.316 115.681,-150.239 113.136,-146.277 119.057,-151.162 119.057,-151.162\"/>\n",
-        "<text text-anchor=\"start\" x=\"93\" y=\"-148.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-66C2.79388,-66 17.1543,-66 30.6317,-66\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-66 30.9419,-69.1501 34.4419,-66 30.9419,-66.0001 30.9419,-66.0001 30.9419,-66.0001 34.4419,-66 30.9418,-62.8501 37.9419,-66 37.9419,-66\"/>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;0 -->\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-83.0373C48.3189,-92.8579 50.4453,-102 56,-102 60.166,-102 62.4036,-96.8576 62.7128,-90.1433\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-83.0373 65.8541,-89.8818 62.5434,-86.5335 62.7076,-90.0296 62.7076,-90.0296 62.7076,-90.0296 62.5434,-86.5335 59.561,-90.1774 62.3792,-83.0373 62.3792,-83.0373\"/>\n",
+        "<text text-anchor=\"start\" x=\"51.5\" y=\"-105.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"141\" cy=\"-113\" rx=\"18\" ry=\"18\"/>\n",
+        "<ellipse fill=\"none\" stroke=\"black\" cx=\"141\" cy=\"-113\" rx=\"22\" ry=\"22\"/>\n",
+        "<text text-anchor=\"start\" x=\"136.5\" y=\"-109.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M68.4614,-79.4988C74.7941,-86.2064 83.1575,-93.9384 92,-99 98.0857,-102.484 105.11,-105.163 111.875,-107.198\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"119.057,-109.162 111.474,-110.354 115.681,-108.239 112.305,-107.316 112.305,-107.316 112.305,-107.316 115.681,-108.239 113.136,-104.277 119.057,-109.162 119.057,-109.162\"/>\n",
+        "<text text-anchor=\"start\" x=\"93\" y=\"-106.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
+        "</g>\n",
+        "<!-- 2 -->\n",
+        "<g id=\"node4\" class=\"node\"><title>2</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"377.5\" cy=\"-53\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"377.5\" y=\"-49.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M73.7415,-62.6785C110.812,-55.6914 202.666,-40.4016 280,-44 304.741,-45.1512 332.934,-47.954 352.43,-50.1285\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"359.451,-50.9264 352.14,-53.2658 355.973,-50.5312 352.495,-50.1359 352.495,-50.1359 352.495,-50.1359 355.973,-50.5312 352.851,-47.006 359.451,-50.9264 359.451,-50.9264\"/>\n",
+        "<text text-anchor=\"start\" x=\"194\" y=\"-50.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "</g>\n",
+        "<!-- 1&#45;&gt;0 -->\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M124.745,-97.6496C117.939,-91.4784 109.538,-84.7216 101,-80 94.818,-76.5813 87.6782,-73.8573 80.9725,-71.7548\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"73.9325,-69.7139 81.5327,-68.6376 77.294,-70.6884 80.6556,-71.663 80.6556,-71.663 80.6556,-71.663 77.294,-70.6884 79.7785,-74.6884 73.9325,-69.7139 73.9325,-69.7139\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-83.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
         "</g>\n",
         "<!-- 3 -->\n",
-        "<g id=\"node7\" class=\"node\"><title>3</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"377.5\" cy=\"-53\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"377.5\" y=\"-49.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
+        "<g id=\"node5\" class=\"node\"><title>3</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"497\" cy=\"-120\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"497\" y=\"-116.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
+        "</g>\n",
+        "<!-- 1&#45;&gt;3 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M162.476,-118.163C205.763,-128.519 309.833,-150.472 398,-146 424.324,-144.665 431.725,-147.476 457,-140 463.084,-138.2 469.341,-135.452 475.014,-132.563\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"481.36,-129.156 476.683,-135.242 478.276,-130.811 475.193,-132.467 475.193,-132.467 475.193,-132.467 478.276,-130.811 473.703,-129.692 481.36,-129.156 481.36,-129.156\"/>\n",
+        "<text text-anchor=\"start\" x=\"301.5\" y=\"-148.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
+        "</g>\n",
+        "<!-- 4 -->\n",
+        "<g id=\"node6\" class=\"node\"><title>4</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"258\" cy=\"-75\" rx=\"18\" ry=\"18\"/>\n",
+        "<ellipse fill=\"none\" stroke=\"black\" cx=\"258\" cy=\"-75\" rx=\"22\" ry=\"22\"/>\n",
+        "<text text-anchor=\"middle\" x=\"258\" y=\"-71.3\" font-family=\"Lato\" font-size=\"14.00\">4</text>\n",
+        "</g>\n",
+        "<!-- 1&#45;&gt;4 -->\n",
+        "<g id=\"edge7\" class=\"edge\"><title>1&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M162.031,-106.381C180.88,-100.153 209.241,-90.7811 230.064,-83.9005\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"236.812,-81.6707 231.154,-86.858 233.489,-82.7689 230.166,-83.8671 230.166,-83.8671 230.166,-83.8671 233.489,-82.7689 229.177,-80.8761 236.812,-81.6707 236.812,-81.6707\"/>\n",
+        "<text text-anchor=\"start\" x=\"181\" y=\"-102.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;3 -->\n",
         "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M73.5012,-103.661C112.314,-93.6736 212.566,-69.1368 298,-59 316.08,-56.8548 336.598,-55.3176 352.122,-54.3364\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"359.309,-53.8992 352.513,-57.4685 355.815,-54.1118 352.322,-54.3244 352.322,-54.3244 352.322,-54.3244 355.815,-54.1118 352.13,-51.1802 359.309,-53.8992 359.309,-53.8992\"/>\n",
-        "<text text-anchor=\"start\" x=\"194\" y=\"-81.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
-        "</g>\n",
-        "<!-- 0&#45;&gt;2 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M123.544,-141.326C116.814,-136.124 108.789,-130.396 101,-126 94.4234,-122.288 86.9271,-118.93 80.0086,-116.147\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"73.3382,-113.564 81.0033,-113.154 76.602,-114.828 79.8659,-116.092 79.8659,-116.092 79.8659,-116.092 76.602,-114.828 78.7284,-119.029 73.3382,-113.564 73.3382,-113.564\"/>\n",
-        "<text text-anchor=\"start\" x=\"92\" y=\"-129.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
-        "</g>\n",
-        "<!-- 4 -->\n",
-        "<g id=\"node4\" class=\"node\"><title>4</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"497\" cy=\"-120\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"497\" y=\"-116.3\" font-family=\"Lato\" font-size=\"14.00\">4</text>\n",
-        "</g>\n",
-        "<!-- 0&#45;&gt;4 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M163.293,-156.093C207.254,-158.09 311.209,-161.474 398,-154 424.498,-151.718 432.107,-153.364 457,-144 463.448,-141.575 470,-138.041 475.846,-134.428\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"481.874,-130.524 477.711,-136.973 478.936,-132.427 475.998,-134.329 475.998,-134.329 475.998,-134.329 478.936,-132.427 474.286,-131.685 481.874,-130.524 481.874,-130.524\"/>\n",
-        "<text text-anchor=\"start\" x=\"301.5\" y=\"-161.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
-        "</g>\n",
-        "<!-- 5 -->\n",
-        "<g id=\"node5\" class=\"node\"><title>5</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"258\" cy=\"-100\" rx=\"18\" ry=\"18\"/>\n",
-        "<ellipse fill=\"none\" stroke=\"black\" cx=\"258\" cy=\"-100\" rx=\"22\" ry=\"22\"/>\n",
-        "<text text-anchor=\"middle\" x=\"258\" y=\"-96.3\" font-family=\"Lato\" font-size=\"14.00\">5</text>\n",
-        "</g>\n",
-        "<!-- 0&#45;&gt;5 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;5</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M161.248,-145.794C180.404,-136.633 209.924,-122.514 231.122,-112.376\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"237.689,-109.236 232.733,-115.098 234.531,-110.746 231.374,-112.256 231.374,-112.256 231.374,-112.256 234.531,-110.746 230.015,-109.414 237.689,-109.236 237.689,-109.236\"/>\n",
-        "<text text-anchor=\"start\" x=\"181\" y=\"-138.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
-        "</g>\n",
-        "<!-- 4&#45;&gt;4 -->\n",
-        "<g id=\"edge11\" class=\"edge\"><title>4&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M486.849,-135.167C483.772,-145.664 487.156,-156 497,-156 504.537,-156 508.287,-149.941 508.25,-142.39\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"507.151,-135.167 511.318,-141.614 507.678,-138.627 508.204,-142.087 508.204,-142.087 508.204,-142.087 507.678,-138.627 505.09,-142.561 507.151,-135.167 507.151,-135.167\"/>\n",
-        "<text text-anchor=\"start\" x=\"480\" y=\"-159.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
-        "</g>\n",
-        "<!-- 4&#45;&gt;5 -->\n",
-        "<g id=\"edge12\" class=\"edge\"><title>4&#45;&gt;5</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M478.921,-118.559C438.561,-115.153 336.959,-106.579 287.26,-102.385\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"280.032,-101.775 287.272,-99.2247 283.52,-102.069 287.007,-102.364 287.007,-102.364 287.007,-102.364 283.52,-102.069 286.742,-105.502 280.032,-101.775 280.032,-101.775\"/>\n",
-        "<text text-anchor=\"start\" x=\"359\" y=\"-114.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
-        "</g>\n",
-        "<!-- 5&#45;&gt;2 -->\n",
-        "<g id=\"edge14\" class=\"edge\"><title>5&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M235.839,-100.846C198.473,-102.341 121.02,-105.439 81.4399,-107.022\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"74.0519,-107.318 80.9204,-103.891 77.5491,-107.178 81.0463,-107.038 81.0463,-107.038 81.0463,-107.038 77.5491,-107.178 81.1722,-110.186 74.0519,-107.318 74.0519,-107.318\"/>\n",
-        "<text text-anchor=\"start\" x=\"134.5\" y=\"-108.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
-        "</g>\n",
-        "<!-- 5&#45;&gt;4 -->\n",
-        "<g id=\"edge16\" class=\"edge\"><title>5&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M277.614,-110.332C283.933,-113.495 291.134,-116.734 298,-119 365.213,-141.186 386.713,-136.34 457,-128 461.98,-127.409 467.271,-126.51 472.295,-125.526\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"479.4,-124.048 473.188,-128.558 475.973,-124.761 472.546,-125.474 472.546,-125.474 472.546,-125.474 475.973,-124.761 471.905,-122.39 479.4,-124.048 479.4,-124.048\"/>\n",
-        "<text text-anchor=\"start\" x=\"359\" y=\"-138.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !b</text>\n",
-        "</g>\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node6\" class=\"node\"><title>1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"497\" cy=\"-22\" rx=\"18\" ry=\"18\"/>\n",
-        "<ellipse fill=\"none\" stroke=\"black\" cx=\"497\" cy=\"-22\" rx=\"22\" ry=\"22\"/>\n",
-        "<text text-anchor=\"middle\" x=\"497\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
-        "<!-- 5&#45;&gt;1 -->\n",
-        "<g id=\"edge13\" class=\"edge\"><title>5&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M271.41,-82.1989C287.952,-60.2785 319.535,-24.315 357,-11 394.219,2.22762 440.463,-5.876 469.106,-13.4921\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"475.993,-15.4047 468.405,-16.5667 472.621,-14.4681 469.248,-13.5315 469.248,-13.5315 469.248,-13.5315 472.621,-14.4681 470.091,-10.4964 475.993,-15.4047 475.993,-15.4047\"/>\n",
-        "<text text-anchor=\"start\" x=\"357\" y=\"-14.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
-        "</g>\n",
-        "<!-- 5&#45;&gt;3 -->\n",
-        "<g id=\"edge15\" class=\"edge\"><title>5&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M277.249,-88.6816C283.664,-84.9808 291.016,-81.0435 298,-78 315.966,-70.1711 337.187,-63.5611 353.033,-59.1079\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"359.904,-57.2169 353.991,-62.1114 356.53,-58.1456 353.155,-59.0743 353.155,-59.0743 353.155,-59.0743 356.53,-58.1456 352.319,-56.0372 359.904,-57.2169 359.904,-57.2169\"/>\n",
-        "<text text-anchor=\"start\" x=\"298\" y=\"-81.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M486.288,-41.3443C484.289,-52.0977 487.859,-62 497,-62 503.998,-62 507.732,-56.1954 508.2,-48.6485\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"507.712,-41.3443 511.321,-48.1187 507.945,-44.8365 508.178,-48.3288 508.178,-48.3288 508.178,-48.3288 507.945,-44.8365 505.035,-48.5388 507.712,-41.3443 507.712,-41.3443\"/>\n",
-        "<text text-anchor=\"start\" x=\"476.5\" y=\"-65.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
-        "</g>\n",
-        "<!-- 3&#45;&gt;4 -->\n",
-        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;4</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M395.499,-55.8003C412.166,-59.1234 437.797,-65.8167 457,-78 466.106,-83.7772 474.491,-92.1901 481.135,-99.9716\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"485.858,-105.745 478.988,-102.322 483.642,-103.036 481.426,-100.327 481.426,-100.327 481.426,-100.327 483.642,-103.036 483.864,-98.3326 485.858,-105.745 485.858,-105.745\"/>\n",
         "<text text-anchor=\"start\" x=\"418\" y=\"-81.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;1 -->\n",
-        "<g id=\"edge9\" class=\"edge\"><title>3&#45;&gt;1</title>\n",
+        "<!-- 5 -->\n",
+        "<g id=\"node7\" class=\"node\"><title>5</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"497\" cy=\"-22\" rx=\"18\" ry=\"18\"/>\n",
+        "<ellipse fill=\"none\" stroke=\"black\" cx=\"497\" cy=\"-22\" rx=\"22\" ry=\"22\"/>\n",
+        "<text text-anchor=\"middle\" x=\"497\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">5</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;5 -->\n",
+        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;5</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M394.383,-46.4766C400.994,-43.9178 408.794,-41.0983 416,-39 432.988,-34.0535 452.392,-29.8946 467.836,-26.9286\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"475.071,-25.5702 468.773,-29.9579 471.631,-26.2161 468.191,-26.862 468.191,-26.862 468.191,-26.862 471.631,-26.2161 467.61,-23.766 475.071,-25.5702 475.071,-25.5702\"/>\n",
         "<text text-anchor=\"start\" x=\"416\" y=\"-42.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
         "</g>\n",
+        "<!-- 3&#45;&gt;3 -->\n",
+        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M486.849,-135.167C483.772,-145.664 487.156,-156 497,-156 504.537,-156 508.287,-149.941 508.25,-142.39\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"507.151,-135.167 511.318,-141.614 507.678,-138.627 508.204,-142.087 508.204,-142.087 508.204,-142.087 507.678,-138.627 505.09,-142.561 507.151,-135.167 507.151,-135.167\"/>\n",
+        "<text text-anchor=\"start\" x=\"480\" y=\"-159.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
+        "</g>\n",
+        "<!-- 3&#45;&gt;4 -->\n",
+        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M478.931,-117.685C444.496,-112.879 364.336,-101.007 298,-86 294.14,-85.1268 290.094,-84.1063 286.129,-83.0453\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"279.139,-81.115 286.725,-79.9419 282.512,-82.0466 285.886,-82.9783 285.886,-82.9783 285.886,-82.9783 282.512,-82.0466 285.048,-86.0147 279.139,-81.115 279.139,-81.115\"/>\n",
+        "<text text-anchor=\"start\" x=\"359\" y=\"-108.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "</g>\n",
+        "<!-- 4&#45;&gt;0 -->\n",
+        "<g id=\"edge12\" class=\"edge\"><title>4&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M235.751,-72.7308C216.718,-70.8083 188.031,-68.1815 163,-67 135.045,-65.6804 102.898,-65.5757 81.4039,-65.7082\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"74.2697,-65.7633 81.2451,-62.5592 77.7696,-65.7362 81.2695,-65.7091 81.2695,-65.7091 81.2695,-65.7091 77.7696,-65.7362 81.2939,-68.859 74.2697,-65.7633 74.2697,-65.7633\"/>\n",
+        "<text text-anchor=\"start\" x=\"134.5\" y=\"-70.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
+        "</g>\n",
+        "<!-- 4&#45;&gt;2 -->\n",
+        "<g id=\"edge13\" class=\"edge\"><title>4&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M279.736,-71.1175C300.127,-67.2996 331.226,-61.4769 352.634,-57.4684\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"359.769,-56.1325 353.469,-60.5171 356.329,-56.7767 352.889,-57.4209 352.889,-57.4209 352.889,-57.4209 356.329,-56.7767 352.309,-54.3247 359.769,-56.1325 359.769,-56.1325\"/>\n",
+        "<text text-anchor=\"start\" x=\"298\" y=\"-70.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "</g>\n",
+        "<!-- 4&#45;&gt;3 -->\n",
+        "<g id=\"edge14\" class=\"edge\"><title>4&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M275.32,-88.9223C282.032,-94.1592 290.08,-99.8453 298,-104 322.519,-116.862 329.72,-119.264 357,-124 396.958,-130.937 444.329,-127.047 472.178,-123.553\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"479.157,-122.634 472.628,-126.671 475.687,-123.091 472.217,-123.548 472.217,-123.548 472.217,-123.548 475.687,-123.091 471.805,-120.425 479.157,-122.634 479.157,-122.634\"/>\n",
+        "<text text-anchor=\"start\" x=\"359\" y=\"-130.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !b</text>\n",
+        "</g>\n",
+        "<!-- 4&#45;&gt;5 -->\n",
+        "<g id=\"edge15\" class=\"edge\"><title>4&#45;&gt;5</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M274.833,-60.3991C293.061,-44.6756 324.669,-20.622 357,-11 394.645,0.203426 440.407,-7.21294 468.875,-14.1473\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"475.725,-15.8883 468.164,-17.2168 472.332,-15.0261 468.94,-14.1639 468.94,-14.1639 468.94,-14.1639 472.332,-15.0261 469.716,-11.111 475.725,-15.8883 475.725,-15.8883\"/>\n",
+        "<text text-anchor=\"start\" x=\"357\" y=\"-14.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "</g>\n",
+        "<!-- 5&#45;&gt;5 -->\n",
+        "<g id=\"edge16\" class=\"edge\"><title>5&#45;&gt;5</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M486.288,-41.3443C484.289,-52.0977 487.859,-62 497,-62 503.998,-62 507.732,-56.1954 508.2,-48.6485\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"507.712,-41.3443 511.321,-48.1187 507.945,-44.8365 508.178,-48.3288 508.178,-48.3288 508.178,-48.3288 507.945,-44.8365 505.035,-48.5388 507.712,-41.3443 507.712,-41.3443\"/>\n",
+        "<text text-anchor=\"start\" x=\"476.5\" y=\"-65.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4660> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae817a3f0> >"
        ]
       }
      ],
@@ -2734,7 +2734,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4450> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816aab0> >"
        ]
       }
      ],
@@ -2804,7 +2804,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4e0f5a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816ae10> >"
        ]
       }
      ],
@@ -3193,35 +3193,35 @@
         "<title>G</title>\n",
         "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-88 157,-88 157,4 -4,4\"/>\n",
         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node2\" class=\"node\"><title>1</title>\n",
+        "<!-- 0 -->\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
-        "<!-- I&#45;&gt;1 -->\n",
-        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;1</title>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-18C2.79388,-18 17.1543,-18 30.6317,-18\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-18 30.9419,-21.1501 34.4419,-18 30.9419,-18.0001 30.9419,-18.0001 30.9419,-18.0001 34.4419,-18 30.9418,-14.8501 37.9419,-18 37.9419,-18\"/>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<!-- 0&#45;&gt;0 -->\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-35.0373C48.3189,-44.8579 50.4453,-54 56,-54 60.166,-54 62.4036,-48.8576 62.7128,-42.1433\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-35.0373 65.8541,-41.8818 62.5434,-38.5335 62.7076,-42.0296 62.7076,-42.0296 62.7076,-42.0296 62.5434,-38.5335 59.561,-42.1774 62.3792,-35.0373 62.3792,-35.0373\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<text text-anchor=\"start\" x=\"51.5\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
-        "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"135\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"135\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<text text-anchor=\"start\" x=\"130.5\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M74.0888,-18C84.5562,-18 98.1196,-18 109.693,-18\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"116.959,-18 109.959,-21.1501 113.459,-18 109.959,-18.0001 109.959,-18.0001 109.959,-18.0001 113.459,-18 109.959,-14.8501 116.959,-18 116.959,-18\"/>\n",
         "<text text-anchor=\"start\" x=\"92\" y=\"-21.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M128.266,-35.0373C126.892,-44.8579 129.137,-54 135,-54 139.397,-54 141.759,-48.8576 142.086,-42.1433\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"141.734,-35.0373 145.226,-41.8728 141.907,-38.533 142.08,-42.0287 142.08,-42.0287 142.08,-42.0287 141.907,-38.533 138.934,-42.1847 141.734,-35.0373 141.734,-35.0373\"/>\n",
         "<text text-anchor=\"start\" x=\"131.5\" y=\"-72.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
@@ -3231,7 +3231,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da46f0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae816af60> >"
        ]
       },
       {
@@ -3279,7 +3279,7 @@
         "<polygon fill=\"black\" points=\"37.9419,-30.4654 30.9419,-33.6155 34.4419,-30.4655 30.9419,-30.4655 30.9419,-30.4655 30.9419,-30.4655 34.4419,-30.4655 30.9418,-27.3155 37.9419,-30.4654 37.9419,-30.4654\" stroke=\"black\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
-        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;0</title>\n",
+        "<g class=\"edge\" id=\"edge2\"><title>0-&gt;0</title>\n",
         "<path d=\"M49.6208,-47.5027C48.3189,-57.3234 50.4453,-66.4654 56,-66.4654 60.166,-66.4654 62.4036,-61.323 62.7128,-54.6087\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"62.3792,-47.5027 65.8541,-54.3473 62.5434,-50.9989 62.7076,-54.495 62.7076,-54.495 62.7076,-54.495 62.5434,-50.9989 59.561,-54.6428 62.3792,-47.5027 62.3792,-47.5027\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"50.5\" y=\"-70.2654\">!a</text>\n",
@@ -3290,21 +3290,21 @@
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"144\" y=\"-26.7654\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge2\"><title>0-&gt;1</title>\n",
+        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;1</title>\n",
         "<path d=\"M74.0378,-33.3939C79.731,-34.2402 86.1223,-35.0477 92,-35.4654 99.0932,-35.9695 100.907,-35.9695 108,-35.4654 111.49,-35.2174 115.161,-34.832 118.759,-34.3826\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"125.962,-33.3939 119.456,-37.4666 122.495,-33.8699 119.027,-34.3459 119.027,-34.3459 119.027,-34.3459 122.495,-33.8699 118.599,-31.2251 125.962,-33.3939 125.962,-33.3939\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"96.5\" y=\"-54.2654\">a</text>\n",
         "<text fill=\"#f17cb0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"92\" y=\"-39.2654\">\u2776</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;0 -->\n",
-        "<g class=\"edge\" id=\"edge5\"><title>1-&gt;0</title>\n",
+        "<g class=\"edge\" id=\"edge4\"><title>1-&gt;0</title>\n",
         "<path d=\"M131.404,-17.3266C125.156,-11.2493 116.908,-4.67653 108,-1.46544 95.985,2.86544 83.5046,-4.00369 73.8973,-12.1402\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"68.5978,-17.0022 71.6264,-9.94872 71.1769,-14.636 73.7559,-12.2699 73.7559,-12.2699 73.7559,-12.2699 71.1769,-14.636 75.8855,-14.591 68.5978,-17.0022 68.5978,-17.0022\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"94.5\" y=\"-20.2654\">!a</text>\n",
         "<text fill=\"#5da5da\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"92\" y=\"-5.26544\">\u24ff</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge4\"><title>1-&gt;1</title>\n",
+        "<g class=\"edge\" id=\"edge5\"><title>1-&gt;1</title>\n",
         "<path d=\"M136.332,-46.7557C134.483,-56.8546 137.039,-66.4654 144,-66.4654 149.221,-66.4654 151.964,-61.0593 152.229,-54.0958\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"151.668,-46.7557 155.342,-53.4954 151.935,-50.2455 152.201,-53.7354 152.201,-53.7354 152.201,-53.7354 151.935,-50.2455 149.06,-53.9754 151.668,-46.7557 151.668,-46.7557\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"140.5\" y=\"-85.2654\">a</text>\n",
@@ -3399,7 +3399,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4090> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae81250f0> >"
        ]
       }
      ],
@@ -3488,7 +3488,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4090> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae81250f0> >"
        ]
       }
      ],
@@ -3577,7 +3577,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4090> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f9ae81250f0> >"
        ]
       }
      ],
diff --git a/tests/python/decompose.ipynb b/tests/python/decompose.ipynb
index debcfdcd9..8d4ab68b2 100644
--- a/tests/python/decompose.ipynb
+++ b/tests/python/decompose.ipynb
@@ -80,138 +80,138 @@
         "<!-- Generated by graphviz version 2.38.0 (20140413.2041)\n",
         " -->\n",
         "<!-- Title: G Pages: 1 -->\n",
-        "<svg width=\"419pt\" height=\"260pt\"\n",
-        " viewBox=\"0.00 0.00 419.00 260.24\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 256.243)\">\n",
+        "<svg width=\"419pt\" height=\"289pt\"\n",
+        " viewBox=\"0.00 0.00 419.00 289.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 285)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-256.243 415,-256.243 415,4 -4,4\"/>\n",
-        "<text text-anchor=\"start\" x=\"184.5\" y=\"-238.043\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
-        "<text text-anchor=\"start\" x=\"206.5\" y=\"-238.043\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
-        "<text text-anchor=\"start\" x=\"222.5\" y=\"-238.043\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
+        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-285 415,-285 415,4 -4,4\"/>\n",
+        "<text text-anchor=\"start\" x=\"184.5\" y=\"-266.8\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
+        "<text text-anchor=\"start\" x=\"206.5\" y=\"-266.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<text text-anchor=\"start\" x=\"222.5\" y=\"-266.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
         "<g id=\"clust1\" class=\"cluster\"><title>cluster_0</title>\n",
-        "<polygon fill=\"none\" stroke=\"green\" points=\"164,-11.2426 164,-111.243 216,-111.243 216,-11.2426 164,-11.2426\"/>\n",
+        "<polygon fill=\"none\" stroke=\"green\" points=\"351,-148 351,-248 403,-248 403,-148 351,-148\"/>\n",
         "</g>\n",
         "<g id=\"clust2\" class=\"cluster\"><title>cluster_1</title>\n",
-        "<polygon fill=\"none\" stroke=\"green\" points=\"351,-32.2426 351,-132.243 403,-132.243 403,-32.2426 351,-32.2426\"/>\n",
+        "<polygon fill=\"none\" stroke=\"green\" points=\"164,-8 164,-108 216,-108 216,-8 164,-8\"/>\n",
         "</g>\n",
         "<g id=\"clust3\" class=\"cluster\"><title>cluster_2</title>\n",
-        "<polygon fill=\"none\" stroke=\"red\" points=\"268,-32.2426 268,-117.243 320,-117.243 320,-32.2426 268,-32.2426\"/>\n",
+        "<polygon fill=\"none\" stroke=\"red\" points=\"268,-148 268,-233 320,-233 320,-148 268,-148\"/>\n",
         "</g>\n",
         "<g id=\"clust4\" class=\"cluster\"><title>cluster_3</title>\n",
-        "<polygon fill=\"none\" stroke=\"green\" points=\"30,-119.243 30,-221.243 216,-221.243 216,-119.243 30,-119.243\"/>\n",
+        "<polygon fill=\"none\" stroke=\"green\" points=\"30,-135 30,-237 216,-237 216,-135 30,-135\"/>\n",
         "</g>\n",
         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node2\" class=\"node\"><title>1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-145.243\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-141.543\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
-        "<!-- I&#45;&gt;1 -->\n",
-        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-145.243C2.79388,-145.243 17.1543,-145.243 30.6317,-145.243\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-145.243 30.9419,-148.393 34.4419,-145.243 30.9419,-145.243 30.9419,-145.243 30.9419,-145.243 34.4419,-145.243 30.9418,-142.093 37.9419,-145.243 37.9419,-145.243\"/>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-162.28C48.3189,-172.101 50.4453,-181.243 56,-181.243 60.166,-181.243 62.4036,-176.1 62.7128,-169.386\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-162.28 65.8541,-169.124 62.5434,-165.776 62.7076,-169.272 62.7076,-169.272 62.7076,-169.272 62.5434,-165.776 59.561,-169.42 62.3792,-162.28 62.3792,-162.28\"/>\n",
-        "<text text-anchor=\"start\" x=\"36\" y=\"-200.043\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
-        "<text text-anchor=\"start\" x=\"48\" y=\"-185.043\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
-        "</g>\n",
         "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-37.2426\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"190\" y=\"-33.5426\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-161\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-157.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M70.6291,-134.092C94.2674,-114.751 142.92,-74.9443 169.91,-52.8619\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"175.642,-48.1723 172.219,-55.0429 172.933,-50.3886 170.224,-52.605 170.224,-52.605 170.224,-52.605 172.933,-50.3886 168.229,-50.167 175.642,-48.1723 175.642,-48.1723\"/>\n",
-        "<text text-anchor=\"start\" x=\"92\" y=\"-121.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b &amp; !c</text>\n",
-        "</g>\n",
-        "<!-- 3 -->\n",
-        "<g id=\"node4\" class=\"node\"><title>3</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"377\" cy=\"-58.2426\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"377\" y=\"-54.5426\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;3 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M61.4186,-127.992C66.5954,-110.192 76.4918,-82.2758 92,-62.2426 116.65,-30.4005 125.855,-20.1451 164,-7.24264 232.475,15.9189 316.751,-23.848 355.157,-45.552\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"361.35,-49.1217 353.712,-48.355 358.318,-47.3738 355.285,-45.6259 355.285,-45.6259 355.285,-45.6259 358.318,-47.3738 356.859,-42.8969 361.35,-49.1217 361.35,-49.1217\"/>\n",
-        "<text text-anchor=\"start\" x=\"238.5\" y=\"-10.0426\" font-family=\"Lato\" font-size=\"14.00\">c</text>\n",
-        "</g>\n",
-        "<!-- 2 -->\n",
-        "<g id=\"node6\" class=\"node\"><title>2</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-145.243\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"190\" y=\"-141.543\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M74.2567,-145.243C97.2816,-145.243 138.189,-145.243 164.429,-145.243\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"171.739,-145.243 164.739,-148.393 168.239,-145.243 164.739,-145.243 164.739,-145.243 164.739,-145.243 168.239,-145.243 164.739,-142.093 171.739,-145.243 171.739,-145.243\"/>\n",
-        "<text text-anchor=\"start\" x=\"105\" y=\"-149.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-161C2.79388,-161 17.1543,-161 30.6317,-161\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-161 30.9419,-164.15 34.4419,-161 30.9419,-161 30.9419,-161 30.9419,-161 34.4419,-161 30.9418,-157.85 37.9419,-161 37.9419,-161\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
         "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M181.021,-53.1587C178.679,-63.393 181.672,-73.2426 190,-73.2426 196.376,-73.2426 199.625,-67.469 199.746,-60.1694\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"198.979,-53.1587 202.872,-59.7742 199.36,-56.6379 199.741,-60.1171 199.741,-60.1171 199.741,-60.1171 199.36,-56.6379 196.61,-60.46 198.979,-53.1587 198.979,-53.1587\"/>\n",
-        "<text text-anchor=\"start\" x=\"185.5\" y=\"-92.0426\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
-        "<text text-anchor=\"start\" x=\"182\" y=\"-77.0426\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-178.037C48.3189,-187.858 50.4453,-197 56,-197 60.166,-197 62.4036,-191.858 62.7128,-185.143\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-178.037 65.8541,-184.882 62.5434,-181.533 62.7076,-185.03 62.7076,-185.03 62.7076,-185.03 62.5434,-181.533 59.561,-185.177 62.3792,-178.037 62.3792,-178.037\"/>\n",
+        "<text text-anchor=\"start\" x=\"36\" y=\"-215.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
+        "<text text-anchor=\"start\" x=\"48\" y=\"-200.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;3 -->\n",
-        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M369.969,-74.9067C368.406,-84.8676 370.75,-94.2426 377,-94.2426 381.688,-94.2426 384.178,-88.9692 384.471,-82.1302\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"384.031,-74.9067 387.601,-81.7025 384.244,-78.4002 384.456,-81.8938 384.456,-81.8938 384.456,-81.8938 384.244,-78.4002 381.312,-82.0851 384.031,-74.9067 384.031,-74.9067\"/>\n",
-        "<text text-anchor=\"start\" x=\"372.5\" y=\"-113.043\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "<text text-anchor=\"start\" x=\"369\" y=\"-98.0426\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"377\" cy=\"-174\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"377\" y=\"-170.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M73.63,-156.447C115.658,-145.684 229.246,-121.222 320,-144 332.58,-147.157 345.419,-153.744 355.624,-159.943\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"361.612,-163.719 354.011,-162.65 358.652,-161.852 355.691,-159.986 355.691,-159.986 355.691,-159.986 358.652,-161.852 357.371,-157.321 361.612,-163.719 361.612,-163.719\"/>\n",
+        "<text text-anchor=\"start\" x=\"238.5\" y=\"-139.8\" font-family=\"Lato\" font-size=\"14.00\">c</text>\n",
+        "</g>\n",
+        "<!-- 2 -->\n",
+        "<g id=\"node4\" class=\"node\"><title>2</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-34\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"190\" y=\"-30.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M63.6726,-144.642C69.681,-131.298 79.4843,-112.511 92,-99 113.848,-75.4146 145.853,-56.1055 167.046,-44.8262\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"173.253,-41.5877 168.504,-47.6186 170.15,-43.2068 167.047,-44.8259 167.047,-44.8259 167.047,-44.8259 170.15,-43.2068 165.59,-42.0332 173.253,-41.5877 173.253,-41.5877\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-102.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b &amp; !c</text>\n",
+        "</g>\n",
+        "<!-- 3 -->\n",
+        "<g id=\"node6\" class=\"node\"><title>3</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-176\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"190\" y=\"-172.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;3 -->\n",
+        "<g id=\"edge5\" class=\"edge\"><title>0&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M74.0161,-159.298C93.5381,-157.777 126.41,-156.539 154,-162 158.195,-162.83 162.529,-164.149 166.657,-165.652\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"173.35,-168.304 165.682,-168.654 170.096,-167.015 166.842,-165.726 166.842,-165.726 166.842,-165.726 170.096,-167.015 168.002,-162.797 173.35,-168.304 173.35,-168.304\"/>\n",
+        "<text text-anchor=\"start\" x=\"105\" y=\"-165.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
+        "</g>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M369.969,-190.664C368.406,-200.625 370.75,-210 377,-210 381.688,-210 384.178,-204.727 384.471,-197.888\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"384.031,-190.664 387.601,-197.46 384.244,-194.158 384.456,-197.651 384.456,-197.651 384.456,-197.651 384.244,-194.158 381.312,-197.842 384.031,-190.664 384.031,-190.664\"/>\n",
+        "<text text-anchor=\"start\" x=\"372.5\" y=\"-228.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<text text-anchor=\"start\" x=\"369\" y=\"-213.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M181.021,-49.916C178.679,-60.1504 181.672,-70 190,-70 196.376,-70 199.625,-64.2263 199.746,-56.9268\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"198.979,-49.916 202.872,-56.5315 199.36,-53.3952 199.741,-56.8744 199.741,-56.8744 199.741,-56.8744 199.36,-53.3952 196.61,-57.2174 198.979,-49.916 198.979,-49.916\"/>\n",
+        "<text text-anchor=\"start\" x=\"185.5\" y=\"-88.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
+        "<text text-anchor=\"start\" x=\"182\" y=\"-73.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
         "<!-- 4 -->\n",
         "<g id=\"node5\" class=\"node\"><title>4</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"294\" cy=\"-58.2426\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"294\" y=\"-54.5426\" font-family=\"Lato\" font-size=\"14.00\">4</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"294\" cy=\"-174\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"294\" y=\"-170.3\" font-family=\"Lato\" font-size=\"14.00\">4</text>\n",
         "</g>\n",
-        "<!-- 4&#45;&gt;3 -->\n",
-        "<g id=\"edge12\" class=\"edge\"><title>4&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M312.178,-58.2426C323.669,-58.2426 338.959,-58.2426 351.693,-58.2426\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"358.847,-58.2426 351.847,-61.3927 355.347,-58.2427 351.847,-58.2427 351.847,-58.2427 351.847,-58.2427 355.347,-58.2427 351.847,-55.0927 358.847,-58.2426 358.847,-58.2426\"/>\n",
-        "<text text-anchor=\"start\" x=\"330\" y=\"-62.0426\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "<!-- 4&#45;&gt;1 -->\n",
+        "<g id=\"edge12\" class=\"edge\"><title>4&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M312.178,-174C323.669,-174 338.959,-174 351.693,-174\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"358.847,-174 351.847,-177.15 355.347,-174 351.847,-174 351.847,-174 351.847,-174 355.347,-174 351.847,-170.85 358.847,-174 358.847,-174\"/>\n",
+        "<text text-anchor=\"start\" x=\"330\" y=\"-177.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;4 -->\n",
         "<g id=\"edge13\" class=\"edge\"><title>4&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M286.969,-74.9067C285.406,-84.8676 287.75,-94.2426 294,-94.2426 298.688,-94.2426 301.178,-88.9692 301.471,-82.1302\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"301.031,-74.9067 304.601,-81.7025 301.244,-78.4002 301.456,-81.8938 301.456,-81.8938 301.456,-81.8938 301.244,-78.4002 298.312,-82.0851 301.031,-74.9067 301.031,-74.9067\"/>\n",
-        "<text text-anchor=\"start\" x=\"290.5\" y=\"-98.0426\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M286.969,-190.664C285.406,-200.625 287.75,-210 294,-210 298.688,-210 301.178,-204.727 301.471,-197.888\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"301.031,-190.664 304.601,-197.46 301.244,-194.158 301.456,-197.651 301.456,-197.651 301.456,-197.651 301.244,-194.158 298.312,-197.842 301.031,-190.664 301.031,-190.664\"/>\n",
+        "<text text-anchor=\"start\" x=\"290.5\" y=\"-213.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;1 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M173.816,-153.903C167.839,-156.847 160.789,-159.764 154,-161.243 127.075,-167.105 118.925,-167.105 92,-161.243 87.5445,-160.273 82.977,-158.682 78.6739,-156.872\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"72.1836,-153.903 79.8596,-153.95 75.3664,-155.359 78.5492,-156.815 78.5492,-156.815 78.5492,-156.815 75.3664,-155.359 77.2387,-159.679 72.1836,-153.903 72.1836,-153.903\"/>\n",
-        "<text text-anchor=\"start\" x=\"103\" y=\"-184.043\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
-        "<text text-anchor=\"start\" x=\"115\" y=\"-169.043\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<!-- 3&#45;&gt;0 -->\n",
+        "<g id=\"edge8\" class=\"edge\"><title>3&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M171.945,-178.448C152.386,-180.735 119.481,-182.984 92,-177 87.5445,-176.03 82.977,-174.44 78.6739,-172.629\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"72.1836,-169.66 79.8596,-169.708 75.3664,-171.116 78.5492,-172.572 78.5492,-172.572 78.5492,-172.572 75.3664,-171.116 77.2387,-175.437 72.1836,-169.66 72.1836,-169.66\"/>\n",
+        "<text text-anchor=\"start\" x=\"103\" y=\"-199.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
+        "<text text-anchor=\"start\" x=\"115\" y=\"-184.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;3 -->\n",
-        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M208.055,-145.496C233.928,-145.159 283.898,-141.629 320,-121.243 337.84,-111.169 352.915,-93.2717 362.915,-79.1208\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"366.883,-73.3192 365.531,-80.8754 364.907,-76.2082 362.931,-79.0971 362.931,-79.0971 362.931,-79.0971 364.907,-76.2082 360.331,-77.3188 366.883,-73.3192 366.883,-73.3192\"/>\n",
-        "<text text-anchor=\"start\" x=\"276\" y=\"-143.043\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; c</text>\n",
+        "<!-- 3&#45;&gt;1 -->\n",
+        "<g id=\"edge9\" class=\"edge\"><title>3&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M202.448,-189.329C216.236,-204.254 240.941,-227.581 268,-237 289.826,-244.598 298.917,-246.468 320,-237 338.806,-228.555 353.873,-210.326 363.62,-195.64\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"367.468,-189.601 366.363,-197.197 365.587,-192.553 363.706,-195.504 363.706,-195.504 363.706,-195.504 365.587,-192.553 361.05,-193.812 367.468,-189.601 367.468,-189.601\"/>\n",
+        "<text text-anchor=\"start\" x=\"276\" y=\"-246.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;4 -->\n",
-        "<g id=\"edge10\" class=\"edge\"><title>2&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M204.335,-133.869C222.203,-118.628 254.008,-91.5003 274.273,-74.2153\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"279.662,-69.6192 276.38,-76.5585 276.999,-71.8905 274.336,-74.1618 274.336,-74.1618 274.336,-74.1618 276.999,-71.8905 272.292,-71.7652 279.662,-69.6192 279.662,-69.6192\"/>\n",
-        "<text text-anchor=\"start\" x=\"226\" y=\"-119.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; c</text>\n",
+        "<!-- 3&#45;&gt;4 -->\n",
+        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M208.303,-175.661C224.962,-175.334 250.303,-174.837 268.927,-174.472\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"275.953,-174.334 269.016,-177.621 272.453,-174.403 268.954,-174.472 268.954,-174.472 268.954,-174.472 272.453,-174.403 268.892,-171.322 275.953,-174.334 275.953,-174.334\"/>\n",
+        "<text text-anchor=\"start\" x=\"226\" y=\"-179.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M181.021,-161.159C178.679,-171.393 181.672,-181.243 190,-181.243 196.376,-181.243 199.625,-175.469 199.746,-168.169\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"198.979,-161.159 202.872,-167.774 199.36,-164.638 199.741,-168.117 199.741,-168.117 199.741,-168.117 199.36,-164.638 196.61,-168.46 198.979,-161.159 198.979,-161.159\"/>\n",
-        "<text text-anchor=\"start\" x=\"172\" y=\"-185.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
+        "<!-- 3&#45;&gt;3 -->\n",
+        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M181.021,-191.916C178.679,-202.15 181.672,-212 190,-212 196.376,-212 199.625,-206.226 199.746,-198.927\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"198.979,-191.916 202.872,-198.532 199.36,-195.395 199.741,-198.874 199.741,-198.874 199.741,-198.874 199.36,-195.395 196.61,-199.217 198.979,-191.916 198.979,-191.916\"/>\n",
+        "<text text-anchor=\"start\" x=\"172\" y=\"-215.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0690> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9690> >"
        ]
       }
      ],
@@ -278,7 +278,7 @@
         "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-142 30.9419,-145.15 34.4419,-142 30.9419,-142 30.9419,-142 30.9419,-142 34.4419,-142 30.9418,-138.85 37.9419,-142 37.9419,-142\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-159.037C48.3189,-168.858 50.4453,-178 56,-178 60.166,-178 62.4036,-172.858 62.7128,-166.143\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-159.037 65.8541,-165.882 62.5434,-162.533 62.7076,-166.03 62.7076,-166.03 62.7076,-166.03 62.5434,-162.533 59.561,-166.177 62.3792,-159.037 62.3792,-159.037\"/>\n",
         "<text text-anchor=\"start\" x=\"36\" y=\"-181.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
@@ -289,7 +289,7 @@
         "<text text-anchor=\"middle\" x=\"190\" y=\"-30.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M70.6291,-130.849C94.2674,-111.508 142.92,-71.7016 169.91,-49.6192\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"175.642,-44.9296 172.219,-51.8003 172.933,-47.146 170.224,-49.3623 170.224,-49.3623 170.224,-49.3623 172.933,-47.146 168.229,-46.9243 175.642,-44.9296 175.642,-44.9296\"/>\n",
         "<text text-anchor=\"start\" x=\"92\" y=\"-117.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b &amp; !c</text>\n",
@@ -328,7 +328,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0660> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9360> >"
        ]
       }
      ],
@@ -395,30 +395,30 @@
         "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-52.2445 65.8541,-59.0891 62.5434,-55.7407 62.7076,-59.2368 62.7076,-59.2368 62.7076,-59.2368 62.5434,-55.7407 59.561,-59.3846 62.3792,-52.2445 62.3792,-52.2445\"/>\n",
         "<text text-anchor=\"start\" x=\"36\" y=\"-75.0072\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
         "</g>\n",
-        "<!-- 2 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>2</title>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"355\" cy=\"-37.2072\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"355\" y=\"-33.5072\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
+        "<text text-anchor=\"middle\" x=\"355\" y=\"-33.5072\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;2 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M73.0478,-29.4272C112.119,-16.1948 215.065,13.6081 298,-7.20721 310.58,-10.3645 323.419,-16.9513 333.624,-23.1507\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"339.612,-26.9265 332.011,-25.8575 336.652,-25.0597 333.691,-23.1929 333.691,-23.1929 333.691,-23.1929 336.652,-25.0597 335.371,-20.5284 339.612,-26.9265 339.612,-26.9265\"/>\n",
         "<text text-anchor=\"start\" x=\"216.5\" y=\"-6.00721\" font-family=\"Lato\" font-size=\"14.00\">c</text>\n",
         "</g>\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node5\" class=\"node\"><title>1</title>\n",
+        "<!-- 2 -->\n",
+        "<g id=\"node5\" class=\"node\"><title>2</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"168\" cy=\"-37.2072\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"168\" y=\"-33.5072\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<text text-anchor=\"middle\" x=\"168\" y=\"-33.5072\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;1 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M74.2788,-35.363C89.4809,-35.5178 112.211,-35.7926 132,-36.2072 135.464,-36.2798 139.121,-36.3696 142.713,-36.4654\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"149.911,-36.6669 142.826,-39.6197 146.413,-36.5689 142.914,-36.471 142.914,-36.471 142.914,-36.471 146.413,-36.5689 143.002,-33.3222 149.911,-36.6669 149.911,-36.6669\"/>\n",
         "<text text-anchor=\"start\" x=\"94\" y=\"-40.0072\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M347.969,-53.8713C346.406,-63.8322 348.75,-73.2072 355,-73.2072 359.688,-73.2072 362.178,-67.9338 362.471,-61.0948\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"362.031,-53.8713 365.601,-60.667 362.244,-57.3648 362.456,-60.8584 362.456,-60.8584 362.456,-60.8584 362.244,-57.3648 359.312,-61.0497 362.031,-53.8713 362.031,-53.8713\"/>\n",
         "<text text-anchor=\"start\" x=\"350.5\" y=\"-92.0072\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
@@ -429,8 +429,8 @@
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"272\" cy=\"-37.2072\" rx=\"18\" ry=\"18\"/>\n",
         "<text text-anchor=\"middle\" x=\"272\" y=\"-33.5072\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;2 -->\n",
-        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;2</title>\n",
+        "<!-- 3&#45;&gt;1 -->\n",
+        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M290.178,-37.2072C301.669,-37.2072 316.959,-37.2072 329.693,-37.2072\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"336.847,-37.2072 329.847,-40.3573 333.347,-37.2073 329.847,-37.2073 329.847,-37.2073 329.847,-37.2073 333.347,-37.2073 329.847,-34.0573 336.847,-37.2072 336.847,-37.2072\"/>\n",
         "<text text-anchor=\"start\" x=\"308\" y=\"-41.0072\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
@@ -441,26 +441,26 @@
         "<polygon fill=\"black\" stroke=\"black\" points=\"279.031,-53.8713 282.601,-60.667 279.244,-57.3648 279.456,-60.8584 279.456,-60.8584 279.456,-60.8584 279.244,-57.3648 276.312,-61.0497 279.031,-53.8713 279.031,-53.8713\"/>\n",
         "<text text-anchor=\"start\" x=\"268.5\" y=\"-77.0072\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
+        "<!-- 2&#45;&gt;0 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>2&#45;&gt;0</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M151.358,-44.9402C145.443,-47.4659 138.555,-49.9449 132,-51.2072 114.543,-54.5691 109.371,-54.9894 92,-51.2072 87.5445,-50.2371 82.977,-48.647 78.6739,-46.8365\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"72.1836,-43.8674 79.8596,-43.915 75.3664,-45.3234 78.5492,-46.7795 78.5492,-46.7795 78.5492,-46.7795 75.3664,-45.3234 77.2387,-49.644 72.1836,-43.8674 72.1836,-43.8674\"/>\n",
         "<text text-anchor=\"start\" x=\"92\" y=\"-58.0072\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>1&#45;&gt;2</title>\n",
+        "<!-- 2&#45;&gt;1 -->\n",
+        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M180.109,-50.6899C193.757,-66.0814 218.509,-90.3938 246,-100.207 267.766,-107.977 276.917,-109.675 298,-100.207 316.806,-91.762 331.873,-73.5336 341.62,-58.8467\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"345.468,-52.808 344.363,-60.4043 343.587,-55.7599 341.706,-58.7117 341.706,-58.7117 341.706,-58.7117 343.587,-55.7599 339.05,-57.0191 345.468,-52.808 345.468,-52.808\"/>\n",
         "<text text-anchor=\"start\" x=\"254\" y=\"-110.007\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; c</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;3 -->\n",
-        "<g id=\"edge8\" class=\"edge\"><title>1&#45;&gt;3</title>\n",
+        "<!-- 2&#45;&gt;3 -->\n",
+        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;3</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M186.303,-37.2072C202.962,-37.2072 228.303,-37.2072 246.927,-37.2072\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"253.953,-37.2072 246.953,-40.3573 250.453,-37.2073 246.953,-37.2073 246.953,-37.2073 246.953,-37.2073 250.453,-37.2073 246.953,-34.0573 253.953,-37.2072 253.953,-37.2072\"/>\n",
         "<text text-anchor=\"start\" x=\"204\" y=\"-41.0072\" font-family=\"Lato\" font-size=\"14.00\">a &amp; c</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M159.021,-53.1232C156.679,-63.3576 159.672,-73.2072 168,-73.2072 174.376,-73.2072 177.625,-67.4336 177.746,-60.134\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"176.979,-53.1232 180.872,-59.7387 177.36,-56.6024 177.741,-60.0816 177.741,-60.0816 177.741,-60.0816 177.36,-56.6024 174.61,-60.4246 176.979,-53.1232 176.979,-53.1232\"/>\n",
         "<text text-anchor=\"start\" x=\"150\" y=\"-77.0072\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
@@ -469,7 +469,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b03f0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9510> >"
        ]
       }
      ],
@@ -559,7 +559,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0510> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9660> >"
        ]
       }
      ],
@@ -636,7 +636,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0ed0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9ed0> >"
        ]
       }
      ],
@@ -700,7 +700,7 @@
         "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-142 30.9419,-145.15 34.4419,-142 30.9419,-142 30.9419,-142 30.9419,-142 34.4419,-142 30.9418,-138.85 37.9419,-142 37.9419,-142\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-159.037C48.3189,-168.858 50.4453,-178 56,-178 60.166,-178 62.4036,-172.858 62.7128,-166.143\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-159.037 65.8541,-165.882 62.5434,-162.533 62.7076,-166.03 62.7076,-166.03 62.7076,-166.03 62.5434,-162.533 59.561,-166.177 62.3792,-159.037 62.3792,-159.037\"/>\n",
         "<text text-anchor=\"start\" x=\"36\" y=\"-196.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
@@ -712,7 +712,7 @@
         "<text text-anchor=\"middle\" x=\"190\" y=\"-30.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M70.6291,-130.849C94.2674,-111.508 142.92,-71.7016 169.91,-49.6192\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"175.642,-44.9296 172.219,-51.8003 172.933,-47.146 170.224,-49.3623 170.224,-49.3623 170.224,-49.3623 172.933,-47.146 168.229,-46.9243 175.642,-44.9296 175.642,-44.9296\"/>\n",
         "<text text-anchor=\"start\" x=\"92\" y=\"-117.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b &amp; !c</text>\n",
@@ -752,7 +752,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b05a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a30923420> >"
        ]
       },
       {
@@ -801,30 +801,30 @@
         "<text text-anchor=\"start\" x=\"36\" y=\"-88.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
         "<text text-anchor=\"start\" x=\"48\" y=\"-73.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
-        "<!-- 2 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>2</title>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"355\" cy=\"-47\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"355\" y=\"-43.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
+        "<text text-anchor=\"middle\" x=\"355\" y=\"-43.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;2 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M73.6763,-29.2967C113.28,-18.8831 215.821,3.62551 298,-17 310.58,-20.1573 323.419,-26.7441 333.624,-32.9435\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"339.612,-36.7193 332.011,-35.6503 336.652,-34.8525 333.691,-32.9857 333.691,-32.9857 333.691,-32.9857 336.652,-34.8525 335.371,-30.3212 339.612,-36.7193 339.612,-36.7193\"/>\n",
         "<text text-anchor=\"start\" x=\"216.5\" y=\"-12.8\" font-family=\"Lato\" font-size=\"14.00\">c</text>\n",
         "</g>\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node5\" class=\"node\"><title>1</title>\n",
+        "<!-- 2 -->\n",
+        "<g id=\"node5\" class=\"node\"><title>2</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"168\" cy=\"-50\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"168\" y=\"-46.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<text text-anchor=\"middle\" x=\"168\" y=\"-46.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;1 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M74.1884,-32.3468C89.5275,-31.3146 112.51,-30.864 132,-35 136.414,-35.9366 140.962,-37.44 145.259,-39.1413\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"151.749,-41.9248 144.074,-42.0607 148.532,-40.5453 145.316,-39.1657 145.316,-39.1657 145.316,-39.1657 148.532,-40.5453 146.557,-36.2707 151.749,-41.9248 151.749,-41.9248\"/>\n",
         "<text text-anchor=\"start\" x=\"94\" y=\"-38.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M347.969,-63.6641C346.406,-73.625 348.75,-83 355,-83 359.688,-83 362.178,-77.7266 362.471,-70.8876\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"362.031,-63.6641 365.601,-70.4598 362.244,-67.1576 362.456,-70.6511 362.456,-70.6511 362.456,-70.6511 362.244,-67.1576 359.312,-70.8425 362.031,-63.6641 362.031,-63.6641\"/>\n",
         "<text text-anchor=\"start\" x=\"350.5\" y=\"-101.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
@@ -835,8 +835,8 @@
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"272\" cy=\"-47\" rx=\"18\" ry=\"18\"/>\n",
         "<text text-anchor=\"middle\" x=\"272\" y=\"-43.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;2 -->\n",
-        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;2</title>\n",
+        "<!-- 3&#45;&gt;1 -->\n",
+        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M290.178,-47C301.669,-47 316.959,-47 329.693,-47\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"336.847,-47 329.847,-50.1501 333.347,-47 329.847,-47.0001 329.847,-47.0001 329.847,-47.0001 333.347,-47 329.847,-43.8501 336.847,-47 336.847,-47\"/>\n",
         "<text text-anchor=\"start\" x=\"308\" y=\"-50.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
@@ -847,27 +847,27 @@
         "<polygon fill=\"black\" stroke=\"black\" points=\"279.031,-63.6641 282.601,-70.4598 279.244,-67.1576 279.456,-70.6511 279.456,-70.6511 279.456,-70.6511 279.244,-67.1576 276.312,-70.8425 279.031,-63.6641 279.031,-63.6641\"/>\n",
         "<text text-anchor=\"start\" x=\"268.5\" y=\"-86.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
+        "<!-- 2&#45;&gt;0 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>2&#45;&gt;0</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M150.1,-52.0318C134.754,-53.3995 111.593,-54.2661 92,-50 87.5445,-49.0299 82.977,-47.4398 78.6739,-45.6293\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"72.1836,-42.6602 79.8596,-42.7078 75.3664,-44.1162 78.5492,-45.5723 78.5492,-45.5723 78.5492,-45.5723 75.3664,-44.1162 77.2387,-48.4368 72.1836,-42.6602 72.1836,-42.6602\"/>\n",
         "<text text-anchor=\"start\" x=\"92\" y=\"-72.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
         "<text text-anchor=\"start\" x=\"104\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>1&#45;&gt;2</title>\n",
+        "<!-- 2&#45;&gt;1 -->\n",
+        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M180.495,-63.1155C194.327,-77.7993 219.074,-100.748 246,-110 267.857,-117.51 276.917,-119.468 298,-110 316.806,-101.555 331.873,-83.3264 341.62,-68.6395\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"345.468,-62.6008 344.363,-70.1971 343.587,-65.5526 341.706,-68.5045 341.706,-68.5045 341.706,-68.5045 343.587,-65.5526 339.05,-66.8119 345.468,-62.6008 345.468,-62.6008\"/>\n",
         "<text text-anchor=\"start\" x=\"254\" y=\"-119.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; c</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;3 -->\n",
-        "<g id=\"edge8\" class=\"edge\"><title>1&#45;&gt;3</title>\n",
+        "<!-- 2&#45;&gt;3 -->\n",
+        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;3</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M186.303,-49.4911C202.962,-49.0011 228.303,-48.2558 246.927,-47.708\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"253.953,-47.5014 247.048,-50.8559 250.454,-47.6043 246.956,-47.7073 246.956,-47.7073 246.956,-47.7073 250.454,-47.6043 246.863,-44.5586 253.953,-47.5014 253.953,-47.5014\"/>\n",
         "<text text-anchor=\"start\" x=\"204\" y=\"-52.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; c</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M159.021,-65.916C156.679,-76.1504 159.672,-86 168,-86 174.376,-86 177.625,-80.2263 177.746,-72.9268\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"176.979,-65.916 180.872,-72.5315 177.36,-69.3952 177.741,-72.8744 177.741,-72.8744 177.741,-72.8744 177.36,-69.3952 174.61,-73.2174 176.979,-65.916 176.979,-65.916\"/>\n",
         "<text text-anchor=\"start\" x=\"150\" y=\"-89.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
@@ -876,7 +876,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b05d0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9e40> >"
        ]
       },
       {
@@ -889,137 +889,137 @@
         "<!-- Generated by graphviz version 2.38.0 (20140413.2041)\n",
         " -->\n",
         "<!-- Title: G Pages: 1 -->\n",
-        "<svg width=\"419pt\" height=\"258pt\"\n",
-        " viewBox=\"0.00 0.00 419.00 258.24\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 254.243)\">\n",
+        "<svg width=\"419pt\" height=\"302pt\"\n",
+        " viewBox=\"0.00 0.00 419.00 302.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 298)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-254.243 415,-254.243 415,4 -4,4\"/>\n",
-        "<text text-anchor=\"start\" x=\"172\" y=\"-236.043\" font-family=\"Lato\" font-size=\"14.00\">option: wt</text>\n",
-        "<text text-anchor=\"start\" x=\"184.5\" y=\"-222.043\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
-        "<text text-anchor=\"start\" x=\"206.5\" y=\"-222.043\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
-        "<text text-anchor=\"start\" x=\"222.5\" y=\"-222.043\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
+        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-298 415,-298 415,4 -4,4\"/>\n",
+        "<text text-anchor=\"start\" x=\"172\" y=\"-279.8\" font-family=\"Lato\" font-size=\"14.00\">option: wt</text>\n",
+        "<text text-anchor=\"start\" x=\"184.5\" y=\"-265.8\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
+        "<text text-anchor=\"start\" x=\"206.5\" y=\"-265.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<text text-anchor=\"start\" x=\"222.5\" y=\"-265.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
         "<g id=\"clust1\" class=\"cluster\"><title>cluster_0</title>\n",
-        "<polygon fill=\"none\" stroke=\"green\" points=\"164,-11.2426 164,-111.243 216,-111.243 216,-11.2426 164,-11.2426\"/>\n",
+        "<polygon fill=\"none\" stroke=\"green\" points=\"351,-148 351,-248 403,-248 403,-148 351,-148\"/>\n",
         "</g>\n",
         "<g id=\"clust2\" class=\"cluster\"><title>cluster_1</title>\n",
-        "<polygon fill=\"none\" stroke=\"green\" points=\"351,-32.2426 351,-132.243 403,-132.243 403,-32.2426 351,-32.2426\"/>\n",
+        "<polygon fill=\"none\" stroke=\"green\" points=\"164,-8 164,-108 216,-108 216,-8 164,-8\"/>\n",
         "</g>\n",
         "<g id=\"clust3\" class=\"cluster\"><title>cluster_2</title>\n",
-        "<polygon fill=\"none\" stroke=\"red\" points=\"268,-32.2426 268,-117.243 320,-117.243 320,-32.2426 268,-32.2426\"/>\n",
+        "<polygon fill=\"none\" stroke=\"red\" points=\"268,-148 268,-233 320,-233 320,-148 268,-148\"/>\n",
         "</g>\n",
         "<g id=\"clust4\" class=\"cluster\"><title>cluster_3</title>\n",
-        "<polygon fill=\"none\" stroke=\"red\" points=\"30,-119.243 30,-206.243 216,-206.243 216,-119.243 30,-119.243\"/>\n",
+        "<polygon fill=\"none\" stroke=\"red\" points=\"30,-146 30,-233 216,-233 216,-146 30,-146\"/>\n",
         "</g>\n",
         "<!-- I -->\n",
         "<!-- 0 -->\n",
         "<g id=\"node2\" class=\"node\"><title>0</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-145.243\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-141.543\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-172\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-168.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
         "<!-- I&#45;&gt;0 -->\n",
         "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-145.243C2.79388,-145.243 17.1543,-145.243 30.6317,-145.243\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-145.243 30.9419,-148.393 34.4419,-145.243 30.9419,-145.243 30.9419,-145.243 30.9419,-145.243 34.4419,-145.243 30.9418,-142.093 37.9419,-145.243 37.9419,-145.243\"/>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-172C2.79388,-172 17.1543,-172 30.6317,-172\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-172 30.9419,-175.15 34.4419,-172 30.9419,-172 30.9419,-172 30.9419,-172 34.4419,-172 30.9418,-168.85 37.9419,-172 37.9419,-172\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-162.28C48.3189,-172.101 50.4453,-181.243 56,-181.243 60.166,-181.243 62.4036,-176.1 62.7128,-169.386\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-162.28 65.8541,-169.124 62.5434,-165.776 62.7076,-169.272 62.7076,-169.272 62.7076,-169.272 62.5434,-165.776 59.561,-169.42 62.3792,-162.28 62.3792,-162.28\"/>\n",
-        "<text text-anchor=\"start\" x=\"36\" y=\"-185.043\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-189.037C48.3189,-198.858 50.4453,-208 56,-208 60.166,-208 62.4036,-202.858 62.7128,-196.143\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-189.037 65.8541,-195.882 62.5434,-192.533 62.7076,-196.03 62.7076,-196.03 62.7076,-196.03 62.5434,-192.533 59.561,-196.177 62.3792,-189.037 62.3792,-189.037\"/>\n",
+        "<text text-anchor=\"start\" x=\"36\" y=\"-211.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
         "</g>\n",
         "<!-- 1 -->\n",
         "<g id=\"node3\" class=\"node\"><title>1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-37.2426\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"190\" y=\"-33.5426\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"377\" cy=\"-174\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"377\" y=\"-170.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M70.6291,-134.092C94.2674,-114.751 142.92,-74.9443 169.91,-52.8619\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"175.642,-48.1723 172.219,-55.0429 172.933,-50.3886 170.224,-52.605 170.224,-52.605 170.224,-52.605 172.933,-50.3886 168.229,-50.167 175.642,-48.1723 175.642,-48.1723\"/>\n",
-        "<text text-anchor=\"start\" x=\"92\" y=\"-121.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b &amp; !c</text>\n",
-        "</g>\n",
-        "<!-- 3 -->\n",
-        "<g id=\"node4\" class=\"node\"><title>3</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"377\" cy=\"-58.2426\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"377\" y=\"-54.5426\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
-        "</g>\n",
-        "<!-- 0&#45;&gt;3 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>0&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M61.4186,-127.992C66.5954,-110.192 76.4918,-82.2758 92,-62.2426 116.65,-30.4005 125.855,-20.1451 164,-7.24264 232.475,15.9189 316.751,-23.848 355.157,-45.552\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"361.35,-49.1217 353.712,-48.355 358.318,-47.3738 355.285,-45.6259 355.285,-45.6259 355.285,-45.6259 358.318,-47.3738 356.859,-42.8969 361.35,-49.1217 361.35,-49.1217\"/>\n",
-        "<text text-anchor=\"start\" x=\"238.5\" y=\"-10.0426\" font-family=\"Lato\" font-size=\"14.00\">c</text>\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M73.2845,-166.381C114.974,-152.825 228.7,-121.085 320,-144 332.58,-147.157 345.419,-153.744 355.624,-159.943\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"361.612,-163.719 354.011,-162.65 358.652,-161.852 355.691,-159.986 355.691,-159.986 355.691,-159.986 358.652,-161.852 357.371,-157.321 361.612,-163.719 361.612,-163.719\"/>\n",
+        "<text text-anchor=\"start\" x=\"238.5\" y=\"-140.8\" font-family=\"Lato\" font-size=\"14.00\">c</text>\n",
         "</g>\n",
         "<!-- 2 -->\n",
-        "<g id=\"node6\" class=\"node\"><title>2</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-145.243\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"190\" y=\"-141.543\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
+        "<g id=\"node4\" class=\"node\"><title>2</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-34\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"190\" y=\"-30.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;2 -->\n",
         "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M74.2567,-145.243C97.2816,-145.243 138.189,-145.243 164.429,-145.243\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"171.739,-145.243 164.739,-148.393 168.239,-145.243 164.739,-145.243 164.739,-145.243 164.739,-145.243 168.239,-145.243 164.739,-142.093 171.739,-145.243 171.739,-145.243\"/>\n",
-        "<text text-anchor=\"start\" x=\"105\" y=\"-149.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M62.2786,-154.873C67.789,-139.056 77.6458,-115.574 92,-99 113.168,-74.5588 145.613,-55.3414 167.065,-44.3263\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"173.345,-41.1744 168.502,-47.1297 170.217,-42.7444 167.089,-44.3144 167.089,-44.3144 167.089,-44.3144 170.217,-42.7444 165.676,-41.499 173.345,-41.1744 173.345,-41.1744\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-102.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b &amp; !c</text>\n",
+        "</g>\n",
+        "<!-- 3 -->\n",
+        "<g id=\"node6\" class=\"node\"><title>3</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-174\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"190\" y=\"-170.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;3 -->\n",
+        "<g id=\"edge5\" class=\"edge\"><title>0&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M74.1729,-172.082C93.5612,-172.197 126.049,-172.457 154,-173 157.464,-173.067 161.121,-173.154 164.713,-173.249\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"171.912,-173.449 164.827,-176.403 168.413,-173.352 164.914,-173.254 164.914,-173.254 164.914,-173.254 168.413,-173.352 165.002,-170.105 171.912,-173.449 171.912,-173.449\"/>\n",
+        "<text text-anchor=\"start\" x=\"105\" y=\"-176.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;1 -->\n",
         "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M181.021,-53.1587C178.679,-63.393 181.672,-73.2426 190,-73.2426 196.376,-73.2426 199.625,-67.469 199.746,-60.1694\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"198.979,-53.1587 202.872,-59.7742 199.36,-56.6379 199.741,-60.1171 199.741,-60.1171 199.741,-60.1171 199.36,-56.6379 196.61,-60.46 198.979,-53.1587 198.979,-53.1587\"/>\n",
-        "<text text-anchor=\"start\" x=\"185.5\" y=\"-92.0426\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
-        "<text text-anchor=\"start\" x=\"182\" y=\"-77.0426\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M369.969,-190.664C368.406,-200.625 370.75,-210 377,-210 381.688,-210 384.178,-204.727 384.471,-197.888\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"384.031,-190.664 387.601,-197.46 384.244,-194.158 384.456,-197.651 384.456,-197.651 384.456,-197.651 384.244,-194.158 381.312,-197.842 384.031,-190.664 384.031,-190.664\"/>\n",
+        "<text text-anchor=\"start\" x=\"372.5\" y=\"-228.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<text text-anchor=\"start\" x=\"369\" y=\"-213.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;3 -->\n",
-        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M369.969,-74.9067C368.406,-84.8676 370.75,-94.2426 377,-94.2426 381.688,-94.2426 384.178,-88.9692 384.471,-82.1302\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"384.031,-74.9067 387.601,-81.7025 384.244,-78.4002 384.456,-81.8938 384.456,-81.8938 384.456,-81.8938 384.244,-78.4002 381.312,-82.0851 384.031,-74.9067 384.031,-74.9067\"/>\n",
-        "<text text-anchor=\"start\" x=\"372.5\" y=\"-113.043\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "<text text-anchor=\"start\" x=\"369\" y=\"-98.0426\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M181.021,-49.916C178.679,-60.1504 181.672,-70 190,-70 196.376,-70 199.625,-64.2263 199.746,-56.9268\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"198.979,-49.916 202.872,-56.5315 199.36,-53.3952 199.741,-56.8744 199.741,-56.8744 199.741,-56.8744 199.36,-53.3952 196.61,-57.2174 198.979,-49.916 198.979,-49.916\"/>\n",
+        "<text text-anchor=\"start\" x=\"185.5\" y=\"-88.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
+        "<text text-anchor=\"start\" x=\"182\" y=\"-73.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
         "<!-- 4 -->\n",
         "<g id=\"node5\" class=\"node\"><title>4</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"294\" cy=\"-58.2426\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"294\" y=\"-54.5426\" font-family=\"Lato\" font-size=\"14.00\">4</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"294\" cy=\"-174\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"294\" y=\"-170.3\" font-family=\"Lato\" font-size=\"14.00\">4</text>\n",
         "</g>\n",
-        "<!-- 4&#45;&gt;3 -->\n",
-        "<g id=\"edge12\" class=\"edge\"><title>4&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M312.178,-58.2426C323.669,-58.2426 338.959,-58.2426 351.693,-58.2426\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"358.847,-58.2426 351.847,-61.3927 355.347,-58.2427 351.847,-58.2427 351.847,-58.2427 351.847,-58.2427 355.347,-58.2427 351.847,-55.0927 358.847,-58.2426 358.847,-58.2426\"/>\n",
-        "<text text-anchor=\"start\" x=\"330\" y=\"-62.0426\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "<!-- 4&#45;&gt;1 -->\n",
+        "<g id=\"edge12\" class=\"edge\"><title>4&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M312.178,-174C323.669,-174 338.959,-174 351.693,-174\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"358.847,-174 351.847,-177.15 355.347,-174 351.847,-174 351.847,-174 351.847,-174 355.347,-174 351.847,-170.85 358.847,-174 358.847,-174\"/>\n",
+        "<text text-anchor=\"start\" x=\"330\" y=\"-177.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;4 -->\n",
         "<g id=\"edge13\" class=\"edge\"><title>4&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M286.969,-74.9067C285.406,-84.8676 287.75,-94.2426 294,-94.2426 298.688,-94.2426 301.178,-88.9692 301.471,-82.1302\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"301.031,-74.9067 304.601,-81.7025 301.244,-78.4002 301.456,-81.8938 301.456,-81.8938 301.456,-81.8938 301.244,-78.4002 298.312,-82.0851 301.031,-74.9067 301.031,-74.9067\"/>\n",
-        "<text text-anchor=\"start\" x=\"290.5\" y=\"-98.0426\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M286.969,-190.664C285.406,-200.625 287.75,-210 294,-210 298.688,-210 301.178,-204.727 301.471,-197.888\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"301.031,-190.664 304.601,-197.46 301.244,-194.158 301.456,-197.651 301.456,-197.651 301.456,-197.651 301.244,-194.158 298.312,-197.842 301.031,-190.664 301.031,-190.664\"/>\n",
+        "<text text-anchor=\"start\" x=\"290.5\" y=\"-213.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;0 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M173.816,-153.903C167.839,-156.847 160.789,-159.764 154,-161.243 127.075,-167.105 118.925,-167.105 92,-161.243 87.5445,-160.273 82.977,-158.682 78.6739,-156.872\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"72.1836,-153.903 79.8596,-153.95 75.3664,-155.359 78.5492,-156.815 78.5492,-156.815 78.5492,-156.815 75.3664,-155.359 77.2387,-159.679 72.1836,-153.903 72.1836,-153.903\"/>\n",
-        "<text text-anchor=\"start\" x=\"103\" y=\"-169.043\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
+        "<!-- 3&#45;&gt;0 -->\n",
+        "<g id=\"edge8\" class=\"edge\"><title>3&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M173.358,-181.733C167.443,-184.259 160.555,-186.738 154,-188 126.942,-193.211 118.925,-193.862 92,-188 87.5445,-187.03 82.977,-185.44 78.6739,-183.629\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"72.1836,-180.66 79.8596,-180.708 75.3664,-182.116 78.5492,-183.572 78.5492,-183.572 78.5492,-183.572 75.3664,-182.116 77.2387,-186.437 72.1836,-180.66 72.1836,-180.66\"/>\n",
+        "<text text-anchor=\"start\" x=\"103\" y=\"-195.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;3 -->\n",
-        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M208.055,-145.496C233.928,-145.159 283.898,-141.629 320,-121.243 337.84,-111.169 352.915,-93.2717 362.915,-79.1208\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"366.883,-73.3192 365.531,-80.8754 364.907,-76.2082 362.931,-79.0971 362.931,-79.0971 362.931,-79.0971 364.907,-76.2082 360.331,-77.3188 366.883,-73.3192 366.883,-73.3192\"/>\n",
-        "<text text-anchor=\"start\" x=\"276\" y=\"-143.043\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; c</text>\n",
+        "<!-- 3&#45;&gt;1 -->\n",
+        "<g id=\"edge9\" class=\"edge\"><title>3&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M202.109,-187.483C215.757,-202.874 240.509,-227.187 268,-237 289.766,-244.77 298.917,-246.468 320,-237 338.806,-228.555 353.873,-210.326 363.62,-195.64\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"367.468,-189.601 366.363,-197.197 365.587,-192.553 363.706,-195.504 363.706,-195.504 363.706,-195.504 365.587,-192.553 361.05,-193.812 367.468,-189.601 367.468,-189.601\"/>\n",
+        "<text text-anchor=\"start\" x=\"276\" y=\"-246.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;4 -->\n",
-        "<g id=\"edge10\" class=\"edge\"><title>2&#45;&gt;4</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M204.335,-133.869C222.203,-118.628 254.008,-91.5003 274.273,-74.2153\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"279.662,-69.6192 276.38,-76.5585 276.999,-71.8905 274.336,-74.1618 274.336,-74.1618 274.336,-74.1618 276.999,-71.8905 272.292,-71.7652 279.662,-69.6192 279.662,-69.6192\"/>\n",
-        "<text text-anchor=\"start\" x=\"226\" y=\"-119.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; c</text>\n",
+        "<!-- 3&#45;&gt;4 -->\n",
+        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M208.303,-174C224.962,-174 250.303,-174 268.927,-174\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"275.953,-174 268.953,-177.15 272.453,-174 268.953,-174 268.953,-174 268.953,-174 272.453,-174 268.953,-170.85 275.953,-174 275.953,-174\"/>\n",
+        "<text text-anchor=\"start\" x=\"226\" y=\"-177.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M181.021,-161.159C178.679,-171.393 181.672,-181.243 190,-181.243 196.376,-181.243 199.625,-175.469 199.746,-168.169\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"198.979,-161.159 202.872,-167.774 199.36,-164.638 199.741,-168.117 199.741,-168.117 199.741,-168.117 199.36,-164.638 196.61,-168.46 198.979,-161.159 198.979,-161.159\"/>\n",
-        "<text text-anchor=\"start\" x=\"172\" y=\"-185.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
+        "<!-- 3&#45;&gt;3 -->\n",
+        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M181.021,-189.916C178.679,-200.15 181.672,-210 190,-210 196.376,-210 199.625,-204.226 199.746,-196.927\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"198.979,-189.916 202.872,-196.532 199.36,-193.395 199.741,-196.874 199.741,-196.874 199.741,-196.874 199.36,-193.395 196.61,-197.217 198.979,-189.916 198.979,-189.916\"/>\n",
+        "<text text-anchor=\"start\" x=\"172\" y=\"-213.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0e70> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9540> >"
        ]
       }
      ],
@@ -1424,7 +1424,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b04b0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777360> >"
        ]
       }
      ],
@@ -1749,7 +1749,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e420> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777450> >"
        ]
       },
       {
@@ -1946,7 +1946,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0540> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d95d0> >"
        ]
       },
       {
@@ -2126,7 +2126,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0360> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9e40> >"
        ]
       }
      ],
@@ -2461,7 +2461,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b03c0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a30923420> >"
        ]
       }
      ],
@@ -2605,7 +2605,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e4b0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7774e0> >"
        ]
       },
       {
@@ -2724,7 +2724,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16823e5a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9e70> >"
        ]
       },
       {
@@ -2904,7 +2904,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0ea0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2d0686f0> >"
        ]
       }
      ],
@@ -3261,7 +3261,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e420> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7774e0> >"
        ]
       }
      ],
@@ -3551,7 +3551,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e4b0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7773f0> >"
        ]
       },
       {
@@ -3703,7 +3703,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0e40> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9e40> >"
        ]
       },
       {
@@ -3840,7 +3840,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b05a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d93f0> >"
        ]
       }
      ],
@@ -4143,7 +4143,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e450> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777510> >"
        ]
       }
      ],
@@ -4254,7 +4254,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e660> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777750> >"
        ]
       }
      ],
@@ -4346,7 +4346,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e5d0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777870> >"
        ]
       },
       {
@@ -4412,7 +4412,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16823e5a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9ea0> >"
        ]
       }
      ],
@@ -4498,7 +4498,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e540> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777930> >"
        ]
       }
      ],
@@ -4653,7 +4653,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e990> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777990> >"
        ]
       }
      ],
@@ -4782,7 +4782,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814ea50> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777420> >"
        ]
       },
       {
@@ -4870,7 +4870,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0e70> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9540> >"
        ]
       },
       {
@@ -4987,7 +4987,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814eab0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777a50> >"
        ]
       }
      ],
@@ -5025,115 +5025,83 @@
         "<!-- Generated by graphviz version 2.38.0 (20140413.2041)\n",
         " -->\n",
         "<!-- Title: G Pages: 1 -->\n",
-        "<svg width=\"397pt\" height=\"152pt\"\n",
-        " viewBox=\"0.00 0.00 397.00 152.21\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 148.207)\">\n",
+        "<svg width=\"232pt\" height=\"242pt\"\n",
+        " viewBox=\"0.00 0.00 232.00 242.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 238)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-148.207 393,-148.207 393,4 -4,4\"/>\n",
-        "<text text-anchor=\"start\" x=\"173.5\" y=\"-130.007\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
-        "<text text-anchor=\"start\" x=\"195.5\" y=\"-130.007\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
-        "<text text-anchor=\"start\" x=\"211.5\" y=\"-130.007\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
+        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-238 228,-238 228,4 -4,4\"/>\n",
+        "<text text-anchor=\"start\" x=\"91\" y=\"-219.8\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
+        "<text text-anchor=\"start\" x=\"113\" y=\"-219.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<text text-anchor=\"start\" x=\"129\" y=\"-219.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
         "<g id=\"clust1\" class=\"cluster\"><title>cluster_0</title>\n",
-        "<polygon fill=\"none\" stroke=\"green\" points=\"329,-11.2072 329,-111.207 381,-111.207 381,-11.2072 329,-11.2072\"/>\n",
+        "<polygon fill=\"none\" stroke=\"green\" points=\"164,-8 164,-108 216,-108 216,-8 164,-8\"/>\n",
         "</g>\n",
         "<g id=\"clust2\" class=\"cluster\"><title>cluster_1</title>\n",
-        "<polygon fill=\"none\" stroke=\"red\" points=\"246,-11.2072 246,-96.2072 298,-96.2072 298,-11.2072 246,-11.2072\"/>\n",
-        "</g>\n",
-        "<g id=\"clust3\" class=\"cluster\"><title>cluster_2</title>\n",
-        "<polygon fill=\"none\" stroke=\"red\" points=\"30,-9.20721 30,-96.2072 194,-96.2072 194,-9.20721 30,-9.20721\"/>\n",
+        "<polygon fill=\"none\" stroke=\"red\" points=\"30,-116 30,-203 216,-203 216,-116 30,-116\"/>\n",
         "</g>\n",
         "<!-- I -->\n",
         "<!-- 0 -->\n",
         "<g id=\"node2\" class=\"node\"><title>0</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-35.2072\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-31.5072\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-142\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-138.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
         "<!-- I&#45;&gt;0 -->\n",
         "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-35.2072C2.79388,-35.2072 17.1543,-35.2072 30.6317,-35.2072\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-35.2072 30.9419,-38.3573 34.4419,-35.2073 30.9419,-35.2073 30.9419,-35.2073 30.9419,-35.2073 34.4419,-35.2073 30.9418,-32.0573 37.9419,-35.2072 37.9419,-35.2072\"/>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-142C2.79388,-142 17.1543,-142 30.6317,-142\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-142 30.9419,-145.15 34.4419,-142 30.9419,-142 30.9419,-142 30.9419,-142 34.4419,-142 30.9418,-138.85 37.9419,-142 37.9419,-142\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
         "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-52.2445C48.3189,-62.0651 50.4453,-71.2072 56,-71.2072 60.166,-71.2072 62.4036,-66.0648 62.7128,-59.3505\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-52.2445 65.8541,-59.0891 62.5434,-55.7407 62.7076,-59.2368 62.7076,-59.2368 62.7076,-59.2368 62.5434,-55.7407 59.561,-59.3846 62.3792,-52.2445 62.3792,-52.2445\"/>\n",
-        "<text text-anchor=\"start\" x=\"36\" y=\"-75.0072\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
-        "</g>\n",
-        "<!-- 2 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>2</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"355\" cy=\"-37.2072\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"355\" y=\"-33.5072\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
-        "</g>\n",
-        "<!-- 0&#45;&gt;2 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M73.0478,-29.4272C112.119,-16.1948 215.065,13.6081 298,-7.20721 310.58,-10.3645 323.419,-16.9513 333.624,-23.1507\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"339.612,-26.9265 332.011,-25.8575 336.652,-25.0597 333.691,-23.1929 333.691,-23.1929 333.691,-23.1929 336.652,-25.0597 335.371,-20.5284 339.612,-26.9265 339.612,-26.9265\"/>\n",
-        "<text text-anchor=\"start\" x=\"216.5\" y=\"-6.00721\" font-family=\"Lato\" font-size=\"14.00\">c</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-159.037C48.3189,-168.858 50.4453,-178 56,-178 60.166,-178 62.4036,-172.858 62.7128,-166.143\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-159.037 65.8541,-165.882 62.5434,-162.533 62.7076,-166.03 62.7076,-166.03 62.7076,-166.03 62.5434,-162.533 59.561,-166.177 62.3792,-159.037 62.3792,-159.037\"/>\n",
+        "<text text-anchor=\"start\" x=\"36\" y=\"-181.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
         "</g>\n",
         "<!-- 1 -->\n",
-        "<g id=\"node5\" class=\"node\"><title>1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"168\" cy=\"-37.2072\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"168\" y=\"-33.5072\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-34\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"190\" y=\"-30.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
         "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M74.2788,-35.363C89.4809,-35.5178 112.211,-35.7926 132,-36.2072 135.464,-36.2798 139.121,-36.3696 142.713,-36.4654\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"149.911,-36.6669 142.826,-39.6197 146.413,-36.5689 142.914,-36.471 142.914,-36.471 142.914,-36.471 146.413,-36.5689 143.002,-33.3222 149.911,-36.6669 149.911,-36.6669\"/>\n",
-        "<text text-anchor=\"start\" x=\"94\" y=\"-40.0072\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M70.6291,-130.849C94.2674,-111.508 142.92,-71.7016 169.91,-49.6192\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"175.642,-44.9296 172.219,-51.8003 172.933,-47.146 170.224,-49.3623 170.224,-49.3623 170.224,-49.3623 172.933,-47.146 168.229,-46.9243 175.642,-44.9296 175.642,-44.9296\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-117.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b &amp; !c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M347.969,-53.8713C346.406,-63.8322 348.75,-73.2072 355,-73.2072 359.688,-73.2072 362.178,-67.9338 362.471,-61.0948\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"362.031,-53.8713 365.601,-60.667 362.244,-57.3648 362.456,-60.8584 362.456,-60.8584 362.456,-60.8584 362.244,-57.3648 359.312,-61.0497 362.031,-53.8713 362.031,-53.8713\"/>\n",
-        "<text text-anchor=\"start\" x=\"350.5\" y=\"-92.0072\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "<text text-anchor=\"start\" x=\"347\" y=\"-77.0072\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<!-- 2 -->\n",
+        "<g id=\"node4\" class=\"node\"><title>2</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"190\" cy=\"-143\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"190\" y=\"-139.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
-        "<!-- 3 -->\n",
-        "<g id=\"node4\" class=\"node\"><title>3</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"272\" cy=\"-37.2072\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"272\" y=\"-33.5072\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
-        "</g>\n",
-        "<!-- 3&#45;&gt;2 -->\n",
-        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M290.178,-37.2072C301.669,-37.2072 316.959,-37.2072 329.693,-37.2072\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"336.847,-37.2072 329.847,-40.3573 333.347,-37.2073 329.847,-37.2073 329.847,-37.2073 329.847,-37.2073 333.347,-37.2073 329.847,-34.0573 336.847,-37.2072 336.847,-37.2072\"/>\n",
-        "<text text-anchor=\"start\" x=\"308\" y=\"-41.0072\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
-        "</g>\n",
-        "<!-- 3&#45;&gt;3 -->\n",
-        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M264.969,-53.8713C263.406,-63.8322 265.75,-73.2072 272,-73.2072 276.688,-73.2072 279.178,-67.9338 279.471,-61.0948\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"279.031,-53.8713 282.601,-60.667 279.244,-57.3648 279.456,-60.8584 279.456,-60.8584 279.456,-60.8584 279.244,-57.3648 276.312,-61.0497 279.031,-53.8713 279.031,-53.8713\"/>\n",
-        "<text text-anchor=\"start\" x=\"268.5\" y=\"-77.0072\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M151.358,-44.9402C145.443,-47.4659 138.555,-49.9449 132,-51.2072 114.543,-54.5691 109.371,-54.9894 92,-51.2072 87.5445,-50.2371 82.977,-48.647 78.6739,-46.8365\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"72.1836,-43.8674 79.8596,-43.915 75.3664,-45.3234 78.5492,-46.7795 78.5492,-46.7795 78.5492,-46.7795 75.3664,-45.3234 77.2387,-49.644 72.1836,-43.8674 72.1836,-43.8674\"/>\n",
-        "<text text-anchor=\"start\" x=\"92\" y=\"-58.0072\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>1&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M180.109,-50.6899C193.757,-66.0814 218.509,-90.3938 246,-100.207 267.766,-107.977 276.917,-109.675 298,-100.207 316.806,-91.762 331.873,-73.5336 341.62,-58.8467\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"345.468,-52.808 344.363,-60.4043 343.587,-55.7599 341.706,-58.7117 341.706,-58.7117 341.706,-58.7117 343.587,-55.7599 339.05,-57.0191 345.468,-52.808 345.468,-52.808\"/>\n",
-        "<text text-anchor=\"start\" x=\"254\" y=\"-110.007\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; c</text>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;3 -->\n",
-        "<g id=\"edge8\" class=\"edge\"><title>1&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M186.303,-37.2072C202.962,-37.2072 228.303,-37.2072 246.927,-37.2072\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"253.953,-37.2072 246.953,-40.3573 250.453,-37.2073 246.953,-37.2073 246.953,-37.2073 246.953,-37.2073 250.453,-37.2073 246.953,-34.0573 253.953,-37.2072 253.953,-37.2072\"/>\n",
-        "<text text-anchor=\"start\" x=\"204\" y=\"-41.0072\" font-family=\"Lato\" font-size=\"14.00\">a &amp; c</text>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M74.2567,-142.131C97.2816,-142.305 138.189,-142.615 164.429,-142.814\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"171.739,-142.869 164.715,-145.966 168.239,-142.843 164.739,-142.816 164.739,-142.816 164.739,-142.816 168.239,-142.843 164.763,-139.666 171.739,-142.869 171.739,-142.869\"/>\n",
+        "<text text-anchor=\"start\" x=\"105\" y=\"-145.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M159.021,-53.1232C156.679,-63.3576 159.672,-73.2072 168,-73.2072 174.376,-73.2072 177.625,-67.4336 177.746,-60.134\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"176.979,-53.1232 180.872,-59.7387 177.36,-56.6024 177.741,-60.0816 177.741,-60.0816 177.741,-60.0816 177.36,-56.6024 174.61,-60.4246 176.979,-53.1232 176.979,-53.1232\"/>\n",
-        "<text text-anchor=\"start\" x=\"150\" y=\"-77.0072\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M179.087,-48.4167C175.276,-59.166 178.914,-70 190,-70 198.661,-70 202.776,-63.3875 202.344,-55.3688\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"200.913,-48.4167 205.41,-54.6375 201.619,-51.8447 202.325,-55.2728 202.325,-55.2728 202.325,-55.2728 201.619,-51.8447 199.239,-55.9082 200.913,-48.4167 200.913,-48.4167\"/>\n",
+        "<text text-anchor=\"start\" x=\"185.5\" y=\"-88.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
+        "<text text-anchor=\"start\" x=\"182\" y=\"-73.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;0 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>2&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M173.759,-151.123C167.774,-153.883 160.735,-156.618 154,-158 127.007,-163.54 118.925,-163.862 92,-158 87.5445,-157.03 82.977,-155.44 78.6739,-153.629\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"72.1836,-150.66 79.8596,-150.708 75.3664,-152.116 78.5492,-153.572 78.5492,-153.572 78.5492,-153.572 75.3664,-152.116 77.2387,-156.437 72.1836,-150.66 72.1836,-150.66\"/>\n",
+        "<text text-anchor=\"start\" x=\"103\" y=\"-165.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M179.087,-157.417C175.276,-168.166 178.914,-179 190,-179 198.661,-179 202.776,-172.387 202.344,-164.369\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"200.913,-157.417 205.41,-163.637 201.619,-160.845 202.325,-164.273 202.325,-164.273 202.325,-164.273 201.619,-160.845 199.239,-164.908 200.913,-157.417 200.913,-157.417\"/>\n",
+        "<text text-anchor=\"start\" x=\"172\" y=\"-182.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0360> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777870> >"
        ]
       }
      ],
@@ -5246,7 +5214,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16816a1b0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7941b0> >"
        ]
       }
      ],
diff --git a/tests/python/decompose_scc.py b/tests/python/decompose_scc.py
index a92669979..6566605ac 100644
--- a/tests/python/decompose_scc.py
+++ b/tests/python/decompose_scc.py
@@ -20,7 +20,6 @@
 import spot
 
 aut = spot.translate('(Ga -> Gb) W c')
-
 si = spot.scc_info(aut)
 
 assert (spot.decompose_scc(si, 2).to_str('hoa', '1.1') == """HOA: v1.1
@@ -50,7 +49,7 @@ except ValueError:
 else:
     raise AssertionError
 
-assert (spot.decompose_acc_scc(aut, 1).to_str('hoa', '1.1') == """HOA: v1.1
+assert (spot.decompose_acc_scc(aut, 0).to_str('hoa', '1.1') == """HOA: v1.1
 States: 4
 Start: 0
 AP: 3 "b" "a" "c"
@@ -61,17 +60,17 @@ properties: deterministic
 --BODY--
 State: 0
 [!1&!2] 0
-[1&!2] 1
-[2] 2
-State: 1
+[2] 1
+[1&!2] 2
+State: 1 {0}
+[t] 1
+State: 2
 [!1&!2] 0
-[1&!2] 1
-[!1&2] 2
+[!1&2] 1
+[1&!2] 2
 [1&2] 3
-State: 2 {0}
-[t] 2
 State: 3
-[!1] 2
+[!1] 1
 [1] 3
 --END--""")
 
diff --git a/tests/python/highlighting.ipynb b/tests/python/highlighting.ipynb
index 861e2282c..ac3fdf7ea 100644
--- a/tests/python/highlighting.ipynb
+++ b/tests/python/highlighting.ipynb
@@ -254,7 +254,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c67b690> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b673b870> >"
        ]
       }
      ],
@@ -356,7 +356,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.twa; proxy of <Swig Object of type 'std::shared_ptr< spot::twa > *' at 0x7f304c60b2d0> >"
+        "<spot.twa; proxy of <Swig Object of type 'std::shared_ptr< spot::twa > *' at 0x7f98b66ad630> >"
        ]
       }
      ],
@@ -571,7 +571,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b150> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad300> >"
        ]
       }
      ],
@@ -750,7 +750,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b150> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad300> >"
        ]
       }
      ],
@@ -830,7 +830,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b870> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad7b0> >"
        ]
       },
       {
@@ -876,7 +876,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b840> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad570> >"
        ]
       }
      ],
@@ -962,7 +962,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b8a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad750> >"
        ]
       }
      ],
@@ -1087,7 +1087,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b8a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad750> >"
        ]
       },
       {
@@ -1144,7 +1144,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b870> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad7b0> >"
        ]
       },
       {
@@ -1190,7 +1190,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b840> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad570> >"
        ]
       }
      ],
@@ -1397,7 +1397,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_product; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_product > *' at 0x7f304c60b6f0> >"
+        "<spot.impl.twa_product; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_product > *' at 0x7f98b66ad510> >"
        ]
       },
       {
@@ -1471,7 +1471,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b690> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adb70> >"
        ]
       },
       {
@@ -1555,7 +1555,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60b810> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad3c0> >"
        ]
       }
      ],
@@ -1701,7 +1701,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60bab0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adcc0> >"
        ]
       }
      ],
@@ -1846,7 +1846,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60bab0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adcc0> >"
        ]
       }
      ],
@@ -1989,7 +1989,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f304c60bab0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adcc0> >"
        ]
       },
       {
@@ -2202,51 +2202,51 @@
         "<polygon fill=\"none\" points=\"30,-44 30,-96 82,-96 82,-44 30,-44\" stroke=\"black\"/>\n",
         "</g>\n",
         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g class=\"node\" id=\"node2\"><title>1</title>\n",
+        "<!-- 0 -->\n",
+        "<g class=\"node\" id=\"node2\"><title>0</title>\n",
         "<ellipse cx=\"56\" cy=\"-70\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"56\" y=\"-66.3\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"56\" y=\"-66.3\">0</text>\n",
         "</g>\n",
-        "<!-- I&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge1\"><title>I-&gt;1</title>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g class=\"edge\" id=\"edge1\"><title>I-&gt;0</title>\n",
         "<path d=\"M1.15491,-70C2.79388,-70 17.1543,-70 30.6317,-70\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"37.9419,-70 30.9419,-73.1501 34.4419,-70 30.9419,-70.0001 30.9419,-70.0001 30.9419,-70.0001 34.4419,-70 30.9418,-66.8501 37.9419,-70 37.9419,-70\" stroke=\"black\"/>\n",
         "</g>\n",
-        "<!-- 0 -->\n",
-        "<g class=\"node\" id=\"node3\"><title>0</title>\n",
+        "<!-- 1 -->\n",
+        "<g class=\"node\" id=\"node3\"><title>1</title>\n",
         "<ellipse cx=\"165\" cy=\"-172\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"165\" y=\"-168.3\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"165\" y=\"-168.3\">1</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g class=\"edge\" id=\"edge19\"><title>1-&gt;0</title>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g class=\"edge\" id=\"edge2\"><title>0-&gt;1</title>\n",
         "<path d=\"M69.6945,-82.1013C88.6787,-100.198 124.54,-134.384 146.153,-154.987\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"151.322,-159.914 144.082,-157.365 148.789,-157.499 146.255,-155.084 146.255,-155.084 146.255,-155.084 148.789,-157.499 148.429,-152.804 151.322,-159.914 151.322,-159.914\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"107\" y=\"-140.8\">a</text>\n",
         "</g>\n",
-        "<!-- 2 -->\n",
-        "<g class=\"node\" id=\"node7\"><title>2</title>\n",
+        "<!-- 3 -->\n",
+        "<g class=\"node\" id=\"node7\"><title>3</title>\n",
         "<ellipse cx=\"417\" cy=\"-34\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"417\" y=\"-30.3\">2</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"417\" y=\"-30.3\">3</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge20\"><title>1-&gt;2</title>\n",
+        "<!-- 0&#45;&gt;3 -->\n",
+        "<g class=\"edge\" id=\"edge4\"><title>0-&gt;3</title>\n",
         "<path d=\"M72.3408,-61.7789C88.538,-53.3659 115,-40.3728 139,-32 165.768,-22.6614 172.849,-20.3569 201,-17 270.302,-8.73591 352.668,-21.519 392.332,-29.0808\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"399.229,-30.4257 391.755,-32.1775 395.793,-29.7558 392.358,-29.0858 392.358,-29.0858 392.358,-29.0858 395.793,-29.7558 392.961,-25.994 399.229,-30.4257 399.229,-30.4257\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"211.5\" y=\"-20.8\">!a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 3 -->\n",
-        "<g class=\"node\" id=\"node8\"><title>3</title>\n",
+        "<!-- 2 -->\n",
+        "<g class=\"node\" id=\"node8\"><title>2</title>\n",
         "<ellipse cx=\"165\" cy=\"-70\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"#5da5da\" stroke-width=\"2\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"165\" y=\"-66.3\">3</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"165\" y=\"-66.3\">2</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge21\"><title>1-&gt;3</title>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;2</title>\n",
         "<path d=\"M74.1914,-70C91.8968,-70 119.648,-70 139.616,-70\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"146.851,-70 139.851,-73.1501 143.351,-70 139.851,-70.0001 139.851,-70.0001 139.851,-70.0001 143.351,-70 139.851,-66.8501 146.851,-70 146.851,-70\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"92\" y=\"-73.8\">!a &amp; b</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g class=\"edge\" id=\"edge2\"><title>0-&gt;0</title>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g class=\"edge\" id=\"edge5\"><title>1-&gt;1</title>\n",
         "<path d=\"M155.767,-187.541C153.169,-197.909 156.246,-208 165,-208 171.702,-208 175.077,-202.085 175.124,-194.659\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"174.233,-187.541 178.229,-194.095 174.668,-191.014 175.103,-194.487 175.103,-194.487 175.103,-194.487 174.668,-191.014 171.977,-194.879 174.233,-187.541 174.233,-187.541\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"160.5\" y=\"-226.8\">1</text>\n",
@@ -2263,7 +2263,7 @@
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"584\" y=\"-100.3\">6</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;6 -->\n",
-        "<g class=\"edge\" id=\"edge3\"><title>4-&gt;6</title>\n",
+        "<g class=\"edge\" id=\"edge11\"><title>4-&gt;6</title>\n",
         "<path d=\"M514.116,-90.6026C524.071,-90.1368 536.821,-90.1368 548,-92 552.14,-92.6901 556.447,-93.8097 560.566,-95.0946\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"567.258,-97.3664 559.617,-98.0987 563.943,-96.2412 560.629,-95.1159 560.629,-95.1159 560.629,-95.1159 563.943,-96.2412 561.642,-92.1331 567.258,-97.3664 567.258,-97.3664\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"534.5\" y=\"-95.8\">!c</text>\n",
@@ -2274,69 +2274,69 @@
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"697\" y=\"-105.3\">7</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;7 -->\n",
-        "<g class=\"edge\" id=\"edge4\"><title>4-&gt;7</title>\n",
+        "<g class=\"edge\" id=\"edge12\"><title>4-&gt;7</title>\n",
         "<path d=\"M512.019,-83.315C525.609,-75.9906 546.433,-66.0696 566,-62 581.665,-58.7419 586.276,-59.0434 602,-62 629.66,-67.2007 636.12,-71.8443 661,-85 666.129,-87.7121 671.415,-91.0267 676.275,-94.3165\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"682.16,-98.4231 674.617,-97.0007 679.29,-96.4202 676.42,-94.4174 676.42,-94.4174 676.42,-94.4174 679.29,-96.4202 678.222,-91.8341 682.16,-98.4231 682.16,-98.4231\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"580.5\" y=\"-65.8\">c</text>\n",
         "</g>\n",
         "<!-- 6&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge5\"><title>6-&gt;4</title>\n",
+        "<g class=\"edge\" id=\"edge16\"><title>6-&gt;4</title>\n",
         "<path d=\"M565.841,-107.212C555.871,-108.533 543.121,-109.283 532,-107 527.58,-106.093 523.029,-104.603 518.732,-102.906\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"512.241,-100.123 519.916,-99.9868 515.458,-101.502 518.675,-102.882 518.675,-102.882 518.675,-102.882 515.458,-101.502 517.433,-105.777 512.241,-100.123 512.241,-100.123\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"533.5\" y=\"-127.8\">!b</text>\n",
         "<text fill=\"#f17cb0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"532\" y=\"-112.8\">\u2776</text>\n",
         "</g>\n",
         "<!-- 6&#45;&gt;6 -->\n",
-        "<g class=\"edge\" id=\"edge6\"><title>6-&gt;6</title>\n",
+        "<g class=\"edge\" id=\"edge17\"><title>6-&gt;6</title>\n",
         "<path d=\"M576.332,-120.29C574.483,-130.389 577.039,-140 584,-140 589.221,-140 591.964,-134.594 592.229,-127.63\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"591.668,-120.29 595.342,-127.03 591.935,-123.78 592.201,-127.27 592.201,-127.27 592.201,-127.27 591.935,-123.78 589.06,-127.51 591.668,-120.29 591.668,-120.29\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"565.5\" y=\"-143.8\">b &amp; !c</text>\n",
         "</g>\n",
         "<!-- 6&#45;&gt;7 -->\n",
-        "<g class=\"edge\" id=\"edge7\"><title>6-&gt;7</title>\n",
+        "<g class=\"edge\" id=\"edge18\"><title>6-&gt;7</title>\n",
         "<path d=\"M600.694,-96.8164C606.614,-94.4708 613.493,-92.1695 620,-91 637.935,-87.7768 643.289,-86.7127 661,-91 665.73,-92.1449 670.537,-94.0459 675.012,-96.1937\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"681.283,-99.4577 673.62,-99.0202 678.178,-97.8418 675.074,-96.226 675.074,-96.226 675.074,-96.226 678.178,-97.8418 676.528,-93.4318 681.283,-99.4577 681.283,-99.4577\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"623.5\" y=\"-94.8\">b &amp; c</text>\n",
         "</g>\n",
         "<!-- 7&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge8\"><title>7-&gt;4</title>\n",
+        "<g class=\"edge\" id=\"edge19\"><title>7-&gt;4</title>\n",
         "<path d=\"M683.103,-120.93C660.18,-140.644 610.556,-176.651 566,-164 548.914,-159.149 544.858,-155.253 532,-143 523.072,-134.492 515.111,-123.354 509.045,-113.657\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"505.342,-107.536 511.661,-111.895 507.154,-110.531 508.966,-113.525 508.966,-113.525 508.966,-113.525 507.154,-110.531 506.27,-115.156 505.342,-107.536 505.342,-107.536\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"579.5\" y=\"-184.8\">b</text>\n",
         "<text fill=\"#f17cb0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"576\" y=\"-169.8\">\u2776</text>\n",
         "</g>\n",
         "<!-- 7&#45;&gt;6 -->\n",
-        "<g class=\"edge\" id=\"edge9\"><title>7-&gt;6</title>\n",
+        "<g class=\"edge\" id=\"edge20\"><title>7-&gt;6</title>\n",
         "<path d=\"M678.791,-108.407C663.385,-107.856 640.18,-106.975 620,-106 616.535,-105.833 612.878,-105.641 609.286,-105.443\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"602.087,-105.037 609.253,-102.287 605.581,-105.234 609.076,-105.431 609.076,-105.431 609.076,-105.431 605.581,-105.234 608.898,-108.576 602.087,-105.037 602.087,-105.037\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"620\" y=\"-111.8\">!b &amp; !c</text>\n",
         "</g>\n",
         "<!-- 7&#45;&gt;7 -->\n",
-        "<g class=\"edge\" id=\"edge10\"><title>7-&gt;7</title>\n",
+        "<g class=\"edge\" id=\"edge21\"><title>7-&gt;7</title>\n",
         "<path d=\"M687.425,-124.541C684.73,-134.909 687.922,-145 697,-145 703.95,-145 707.45,-139.085 707.499,-131.659\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"706.575,-124.541 710.6,-131.077 707.026,-128.012 707.477,-131.483 707.477,-131.483 707.477,-131.483 707.026,-128.012 704.353,-131.889 706.575,-124.541 706.575,-124.541\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"678.5\" y=\"-148.8\">!b &amp; c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge11\"><title>2-&gt;4</title>\n",
+        "<!-- 3&#45;&gt;4 -->\n",
+        "<g class=\"edge\" id=\"edge10\"><title>3-&gt;4</title>\n",
         "<path d=\"M432.606,-43.6256C440.786,-49.1295 451.099,-56.26 460,-63 465.452,-67.1281 471.223,-71.7844 476.473,-76.1383\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"481.925,-80.7047 474.536,-78.625 479.242,-78.4574 476.558,-76.21 476.558,-76.21 476.558,-76.21 479.242,-78.4574 478.581,-73.7951 481.925,-80.7047 481.925,-80.7047\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"453\" y=\"-66.8\">a</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge14\"><title>3-&gt;4</title>\n",
+        "<!-- 2&#45;&gt;4 -->\n",
+        "<g class=\"edge\" id=\"edge8\"><title>2-&gt;4</title>\n",
         "<path d=\"M172.788,-86.4554C178.475,-97.8739 187.8,-112.207 201,-119 292.409,-166.041 421.048,-122.799 472.473,-101.867\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"479.204,-99.0728 473.947,-104.666 475.972,-100.414 472.739,-101.756 472.739,-101.756 472.739,-101.756 475.972,-100.414 471.532,-98.8468 479.204,-99.0728 479.204,-99.0728\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"357\" y=\"-141.8\">a</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge12\"><title>3-&gt;2</title>\n",
+        "<!-- 2&#45;&gt;3 -->\n",
+        "<g class=\"edge\" id=\"edge7\"><title>2-&gt;3</title>\n",
         "<path d=\"M181.764,-62.7925C187.692,-60.3237 194.557,-57.7464 201,-56 268.503,-37.7027 351.689,-34.3871 391.933,-33.9368\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"398.934,-33.8831 391.959,-37.0868 395.435,-33.91 391.935,-33.9369 391.935,-33.9369 391.935,-33.9369 395.435,-33.91 391.91,-30.787 398.934,-33.8831 398.934,-33.8831\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"281\" y=\"-44.8\">!a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge13\"><title>3-&gt;3</title>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge6\"><title>2-&gt;2</title>\n",
         "<path d=\"M155.767,-85.5414C153.169,-95.9087 156.246,-106 165,-106 171.702,-106 175.077,-100.085 175.124,-92.6591\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"174.233,-85.5414 178.229,-92.0955 174.668,-89.0143 175.103,-92.4871 175.103,-92.4871 175.103,-92.4871 174.668,-89.0143 171.977,-92.8788 174.233,-85.5414 174.233,-85.5414\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"132\" y=\"-109.8\">!a &amp; b &amp; !c</text>\n",
@@ -2346,26 +2346,26 @@
         "<ellipse cx=\"301.5\" cy=\"-86\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"#5da5da\" stroke-width=\"2\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"301.5\" y=\"-82.3\">5</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;5 -->\n",
-        "<g class=\"edge\" id=\"edge15\"><title>3-&gt;5</title>\n",
+        "<!-- 2&#45;&gt;5 -->\n",
+        "<g class=\"edge\" id=\"edge9\"><title>2-&gt;5</title>\n",
         "<path d=\"M182.479,-65.4387C202.062,-60.7826 235.539,-55.2494 263,-63 269.128,-64.7296 275.242,-67.7722 280.702,-71.0891\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"286.771,-75.0467 279.187,-73.8619 283.839,-73.135 280.907,-71.2233 280.907,-71.2233 280.907,-71.2233 283.839,-73.135 282.628,-68.5846 286.771,-75.0467 286.771,-75.0467\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"201\" y=\"-66.8\">!a &amp; b &amp; c</text>\n",
         "</g>\n",
         "<!-- 5&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge18\"><title>5-&gt;4</title>\n",
+        "<g class=\"edge\" id=\"edge15\"><title>5-&gt;4</title>\n",
         "<path d=\"M319.583,-86.5325C353.83,-87.5999 430.982,-90.0046 470.564,-91.2383\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"477.955,-91.4687 470.86,-94.399 474.457,-91.3596 470.959,-91.2506 470.959,-91.2506 470.959,-91.2506 474.457,-91.3596 471.057,-88.1021 477.955,-91.4687 477.955,-91.4687\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"413.5\" y=\"-94.8\">a</text>\n",
         "</g>\n",
-        "<!-- 5&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge16\"><title>5-&gt;2</title>\n",
+        "<!-- 5&#45;&gt;3 -->\n",
+        "<g class=\"edge\" id=\"edge14\"><title>5-&gt;3</title>\n",
         "<path d=\"M316.747,-76.3975C323.606,-72.0012 332.051,-66.912 340,-63 357.251,-54.5098 377.649,-46.8478 392.967,-41.5345\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"399.618,-39.264 394.011,-44.5067 396.306,-40.3948 392.994,-41.5256 392.994,-41.5256 392.994,-41.5256 396.306,-40.3948 391.976,-38.5445 399.618,-39.264 399.618,-39.264\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"340\" y=\"-66.8\">!a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 5&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge17\"><title>5-&gt;3</title>\n",
+        "<!-- 5&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge13\"><title>5-&gt;2</title>\n",
         "<path d=\"M283.156,-85.3654C263.232,-84.4607 229.605,-82.3956 201,-78 197.321,-77.4347 193.454,-76.6977 189.686,-75.9\" fill=\"none\" stroke=\"black\"/>\n",
         "<polygon fill=\"black\" points=\"182.64,-74.3203 190.16,-72.7781 186.055,-75.086 189.471,-75.8518 189.471,-75.8518 189.471,-75.8518 186.055,-75.086 188.781,-78.9255 182.64,-74.3203 182.64,-74.3203\" stroke=\"black\"/>\n",
         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"213.5\" y=\"-103.8\">!a &amp; b</text>\n",
diff --git a/tests/python/piperead.ipynb b/tests/python/piperead.ipynb
index 4f9392704..874c75352 100644
--- a/tests/python/piperead.ipynb
+++ b/tests/python/piperead.ipynb
@@ -15,10 +15,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.4.3+"
+   "version": "3.5.3"
   },
-  "name": "",
-  "signature": "sha256:8de782e4035d4a93101b749825f0975f5f8cee034332d048014ba13dfa232983"
+  "name": ""
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -111,7 +110,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f330> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb6866420> >"
        ]
       },
       {
@@ -162,7 +161,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f4e0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb47205d0> >"
        ]
       },
       {
@@ -208,7 +207,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f270> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb4720360> >"
        ]
       },
       {
@@ -227,36 +226,36 @@
         "<title>G</title>\n",
         "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-121 157,-121 157,4 -4,4\"/>\n",
         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node2\" class=\"node\"><title>1</title>\n",
+        "<!-- 0 -->\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
-        "<!-- I&#45;&gt;1 -->\n",
-        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;1</title>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-18C2.79388,-18 17.1543,-18 30.6317,-18\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-18 30.9419,-21.1501 34.4419,-18 30.9419,-18.0001 30.9419,-18.0001 30.9419,-18.0001 34.4419,-18 30.9418,-14.8501 37.9419,-18 37.9419,-18\"/>\n",
         "</g>\n",
-        "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"135\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"135\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<text text-anchor=\"middle\" x=\"135\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M74.0888,-18C84.5562,-18 98.1196,-18 109.693,-18\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"116.959,-18 109.959,-21.1501 113.459,-18 109.959,-18.0001 109.959,-18.0001 109.959,-18.0001 113.459,-18 109.959,-14.8501 116.959,-18 116.959,-18\"/>\n",
         "<text text-anchor=\"start\" x=\"92\" y=\"-21.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M131.584,-35.7817C131.004,-45.3149 132.143,-54 135,-54 137.098,-54 138.27,-49.3161 138.514,-43.0521\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"138.416,-35.7817 141.66,-42.7383 138.463,-39.2814 138.511,-42.7811 138.511,-42.7811 138.511,-42.7811 138.463,-39.2814 135.361,-42.8239 138.416,-35.7817 138.416,-35.7817\"/>\n",
         "<text text-anchor=\"start\" x=\"130.5\" y=\"-72.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
         "<text text-anchor=\"start\" x=\"127\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M129.769,-35.249C126.057,-56.4346 127.801,-84 135,-84 141.412,-84 143.496,-62.1347 141.253,-42.3851\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"140.231,-35.249 144.342,-41.7316 140.727,-38.7137 141.223,-42.1783 141.223,-42.1783 141.223,-42.1783 140.727,-38.7137 138.105,-42.625 140.231,-35.249 140.231,-35.249\"/>\n",
         "<text text-anchor=\"start\" x=\"128.5\" y=\"-87.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
@@ -265,7 +264,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f330> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb47203f0> >"
        ]
       }
      ],
@@ -342,7 +341,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f4e0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb4720660> >"
        ]
       }
      ],
@@ -371,10 +370,11 @@
        "evalue": "Command 'non-existing-command' returned non-zero exit status 127",
        "output_type": "pyerr",
        "traceback": [
-        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mCalledProcessError\u001b[0m                        Traceback (most recent call last)",
+        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+        "\u001b[0;31mCalledProcessError\u001b[0m                        Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-4-765c7cc6937f>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mspot\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mautomaton\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'non-existing-command|'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-        "\u001b[0;32m/home/adl/git/spot/python/spot.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    457\u001b[0m     See `spot.automata` for a list of supported formats.\"\"\"\n\u001b[1;32m    458\u001b[0m     \u001b[0;32mtry\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 459\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    460\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    461\u001b[0m         \u001b[0;32mraise\u001b[0m \u001b[0mRuntimeError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Failed to read automaton from {}\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mformat\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-        "\u001b[0;32m/home/adl/git/spot/python/spot.py\u001b[0m in \u001b[0;36mautomata\u001b[0;34m(timeout, ignore_abort, trust_hoa, debug, *sources)\u001b[0m\n\u001b[1;32m    442\u001b[0m                 \u001b[0;32mdel\u001b[0m \u001b[0mproc\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    443\u001b[0m                 \u001b[0;32mif\u001b[0m \u001b[0mret\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 444\u001b[0;31m                     \u001b[0;32mraise\u001b[0m \u001b[0msubprocess\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mCalledProcessError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mret\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mfilename\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    445\u001b[0m     \u001b[0;31m# deleting o explicitely now prevents Python 3.5 from\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    446\u001b[0m     \u001b[0;31m# reporting the following error: \"<built-in function\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    463\u001b[0m     See `spot.automata` for a list of supported formats.\"\"\"\n\u001b[1;32m    464\u001b[0m     \u001b[0;32mtry\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 465\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    466\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    467\u001b[0m         \u001b[0;32mraise\u001b[0m \u001b[0mRuntimeError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Failed to read automaton from {}\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mformat\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomata\u001b[0;34m(timeout, ignore_abort, trust_hoa, no_sid, debug, *sources)\u001b[0m\n\u001b[1;32m    448\u001b[0m                 \u001b[0;32mdel\u001b[0m \u001b[0mproc\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    449\u001b[0m                 \u001b[0;32mif\u001b[0m \u001b[0mret\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 450\u001b[0;31m                     \u001b[0;32mraise\u001b[0m \u001b[0msubprocess\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mCalledProcessError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mret\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mfilename\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    451\u001b[0m     \u001b[0;31m# deleting o explicitely now prevents Python 3.5 from\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    452\u001b[0m     \u001b[0;31m# reporting the following error: \"<built-in function\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
         "\u001b[0;31mCalledProcessError\u001b[0m: Command 'non-existing-command' returned non-zero exit status 127"
        ]
       }
@@ -445,7 +445,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f780> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb4720570> >"
        ]
       },
       {
@@ -453,9 +453,10 @@
        "evalue": "Command 'ltl2tgba \"syntax U U error\"' returned non-zero exit status 2",
        "output_type": "pyerr",
        "traceback": [
-        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mCalledProcessError\u001b[0m                        Traceback (most recent call last)",
+        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+        "\u001b[0;31mCalledProcessError\u001b[0m                        Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-5-1163f8abbaad>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;32mfor\u001b[0m \u001b[0ma\u001b[0m \u001b[0;32min\u001b[0m \u001b[0mspot\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"ltl2tgba 'a U b'|\"\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m'ltl2tgba \"syntax U U error\"|'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      2\u001b[0m     \u001b[0mdisplay\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0ma\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-        "\u001b[0;32m/home/adl/git/spot/python/spot.py\u001b[0m in \u001b[0;36mautomata\u001b[0;34m(timeout, ignore_abort, trust_hoa, debug, *sources)\u001b[0m\n\u001b[1;32m    442\u001b[0m                 \u001b[0;32mdel\u001b[0m \u001b[0mproc\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    443\u001b[0m                 \u001b[0;32mif\u001b[0m \u001b[0mret\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 444\u001b[0;31m                     \u001b[0;32mraise\u001b[0m \u001b[0msubprocess\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mCalledProcessError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mret\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mfilename\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    445\u001b[0m     \u001b[0;31m# deleting o explicitely now prevents Python 3.5 from\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    446\u001b[0m     \u001b[0;31m# reporting the following error: \"<built-in function\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomata\u001b[0;34m(timeout, ignore_abort, trust_hoa, no_sid, debug, *sources)\u001b[0m\n\u001b[1;32m    448\u001b[0m                 \u001b[0;32mdel\u001b[0m \u001b[0mproc\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    449\u001b[0m                 \u001b[0;32mif\u001b[0m \u001b[0mret\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 450\u001b[0;31m                     \u001b[0;32mraise\u001b[0m \u001b[0msubprocess\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mCalledProcessError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mret\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mfilename\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    451\u001b[0m     \u001b[0;31m# deleting o explicitely now prevents Python 3.5 from\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    452\u001b[0m     \u001b[0;31m# reporting the following error: \"<built-in function\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
         "\u001b[0;31mCalledProcessError\u001b[0m: Command 'ltl2tgba \"syntax U U error\"' returned non-zero exit status 2"
        ]
       }
@@ -483,25 +484,22 @@
        "evalue": "Failed to read automaton from true|",
        "output_type": "pyerr",
        "traceback": [
-        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mRuntimeError\u001b[0m                              Traceback (most recent call last)",
+        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+        "\u001b[0;31mStopIteration\u001b[0m                             Traceback (most recent call last)",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    464\u001b[0m     \u001b[0;32mtry\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 465\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    466\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;31mStopIteration\u001b[0m: ",
+        "\nDuring handling of the above exception, another exception occurred:\n",
+        "\u001b[0;31mRuntimeError\u001b[0m                              Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-6-f4e056a50029>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mspot\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mautomaton\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'true|'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-        "\u001b[0;32m/home/adl/git/spot/python/spot.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    459\u001b[0m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    460\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 461\u001b[0;31m         \u001b[0;32mraise\u001b[0m \u001b[0mRuntimeError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Failed to read automaton from {}\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mformat\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    462\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    463\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    465\u001b[0m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    466\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 467\u001b[0;31m         \u001b[0;32mraise\u001b[0m \u001b[0mRuntimeError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Failed to read automaton from {}\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mformat\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    468\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    469\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
         "\u001b[0;31mRuntimeError\u001b[0m: Failed to read automaton from true|"
        ]
       }
      ],
      "prompt_number": 6
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [],
-     "language": "python",
-     "metadata": {},
-     "outputs": []
     }
    ],
    "metadata": {}
   }
  ]
-}
\ No newline at end of file
+}
diff --git a/tests/python/sccinfo.py b/tests/python/sccinfo.py
index 19c5d21c1..16267fdf4 100644
--- a/tests/python/sccinfo.py
+++ b/tests/python/sccinfo.py
@@ -70,10 +70,10 @@ while todo:
             seen.add(s)
             todo.add(s)
 assert seen == {0, 1, 2, 3}
-assert trans == [(1, 0), (1, 1), (1, 2), (1, 3),
-                 (2, 1), (2, 2), (2, 3), (2, 4),
-                 (0, 0), (3, 3), (4, 3), (4, 4)]
-assert transi == [(1, 1, 3), (1, 2, 4), (2, 1, 6), (2, 2, 7),
-                  (0, 0, 1), (3, 3, 10), (4, 4, 12)]
+assert trans == [(0, 0), (0, 1), (0, 2), (0, 3),
+                 (3, 0), (3, 1), (3, 3), (3, 4),
+                 (1, 1), (2, 2), (4, 1), (4, 4)]
+assert transi == [(0, 0, 1), (0, 3, 4), (3, 0, 7),
+                  (3, 3, 9), (1, 1, 5), (2, 2, 6), (4, 4, 12)]
 
 assert not spot.is_weak_automaton(a, si)
diff --git a/tests/python/simstate.py b/tests/python/simstate.py
index 9c4943ac7..ec8a8aea8 100644
--- a/tests/python/simstate.py
+++ b/tests/python/simstate.py
@@ -75,21 +75,21 @@ Acceptance: 4 Fin(0) & (Inf(1) | (Fin(2) & Inf(3)))
 properties: trans-labels explicit-labels trans-acc complete
 properties: deterministic stutter-invariant
 --BODY--
-State: 0 "{₀[1]₀}"
-[0&1] 1 {3}
-[!0&1] 0
+State: 0 "{₀[0]₀}"
 [0&!1] 0 {1}
 [!0&!1] 0
-State: 1 "{₀[1]{₂[0]₂}₀}{₁[2]₁}"
+[!0&1] 0
 [0&1] 1 {3}
-[!0&1] 2
+State: 1 "{₀[0]{₂[2]₂}₀}{₁[1]₁}"
 [0&!1] 0 {1}
 [!0&!1] 0 {2}
-State: 2 "{₀[1]₀}{₁[2]₁}"
-[0&1] 1 {3}
 [!0&1] 2
+[0&1] 1 {3}
+State: 2 "{₀[0]₀}{₁[1]₁}"
 [0&!1] 0 {1}
 [!0&!1] 0 {2}
+[!0&1] 2
+[0&1] 1 {3}
 --END--"""
 
 aut = spot.automaton("""
@@ -166,4 +166,3 @@ State: 11 "{₀[1#1]{₁[0#0,0#1]{₂[1#0]₂}₁}₀}"
 [0&1] 9 {1}
 [!0&1] 1 {1}
 --END--"""
-
diff --git a/tests/python/testingaut.ipynb b/tests/python/testingaut.ipynb
index 9d7f44e85..1185ceb52 100644
--- a/tests/python/testingaut.ipynb
+++ b/tests/python/testingaut.ipynb
@@ -1,7 +1,23 @@
 {
  "metadata": {
-  "name": "",
-  "signature": "sha256:1a85b698ebae51aaba0387d782d1cf5c6cdf54f69dd6b4b9c7189f8676eb4c88"
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.5.3"
+  },
+  "name": ""
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -58,36 +74,36 @@
         "<title>G</title>\n",
         "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-81 167,-81 167,4 -4,4\"/>\n",
         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node2\" class=\"node\"><title>1</title>\n",
+        "<!-- 0 -->\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-22\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
-        "<!-- I&#45;&gt;1 -->\n",
-        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;1</title>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-22C2.79388,-22 17.1543,-22 30.6317,-22\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-22 30.9419,-25.1501 34.4419,-22 30.9419,-22.0001 30.9419,-22.0001 30.9419,-22.0001 34.4419,-22 30.9418,-18.8501 37.9419,-22 37.9419,-22\"/>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<!-- 0&#45;&gt;0 -->\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-39.0373C48.3189,-48.8579 50.4453,-58 56,-58 60.166,-58 62.4036,-52.8576 62.7128,-46.1433\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"62.3792,-39.0373 65.8541,-45.8818 62.5434,-42.5335 62.7076,-46.0296 62.7076,-46.0296 62.7076,-46.0296 62.5434,-42.5335 59.561,-46.1774 62.3792,-39.0373 62.3792,-39.0373\"/>\n",
         "<text text-anchor=\"start\" x=\"52.5\" y=\"-61.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
-        "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"141\" cy=\"-22\" rx=\"18\" ry=\"18\"/>\n",
         "<ellipse fill=\"none\" stroke=\"black\" cx=\"141\" cy=\"-22\" rx=\"22\" ry=\"22\"/>\n",
-        "<text text-anchor=\"middle\" x=\"141\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<text text-anchor=\"middle\" x=\"141\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M74.1977,-22C85.0734,-22 99.3874,-22 111.887,-22\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"118.997,-22 111.997,-25.1501 115.497,-22 111.997,-22.0001 111.997,-22.0001 111.997,-22.0001 115.497,-22 111.997,-18.8501 118.997,-22 118.997,-22\"/>\n",
         "<text text-anchor=\"start\" x=\"92\" y=\"-25.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M132.994,-42.5808C131.886,-52.8447 134.555,-62 141,-62 145.834,-62 148.544,-56.8502 149.129,-49.9451\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"149.006,-42.5808 152.273,-49.5273 149.065,-46.0803 149.123,-49.5798 149.123,-49.5798 149.123,-49.5798 149.065,-46.0803 145.973,-49.6324 149.006,-42.5808 149.006,-42.5808\"/>\n",
         "<text text-anchor=\"start\" x=\"136.5\" y=\"-65.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
@@ -96,7 +112,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2e817bf6c0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f99b4744e40> >"
        ]
       }
      ],
@@ -125,240 +141,240 @@
        "output_type": "pyout",
        "prompt_number": 3,
        "svg": [
-        "<svg height=\"295pt\" viewBox=\"0.00 0.00 734.00 295.42\" width=\"734pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g class=\"graph\" id=\"graph0\" transform=\"scale(0.749788 0.749788) rotate(0) translate(4 390)\">\n",
+        "<svg height=\"265pt\" viewBox=\"0.00 0.00 734.00 264.84\" width=\"734pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g class=\"graph\" id=\"graph0\" transform=\"scale(0.708119 0.708119) rotate(0) translate(4 370)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" points=\"-4,4 -4,-390 974.944,-390 974.944,4 -4,4\" stroke=\"none\"/>\n",
+        "<polygon fill=\"white\" points=\"-4,4 -4,-370 1032.55,-370 1032.55,4 -4,4\" stroke=\"none\"/>\n",
         "<!-- 0 -->\n",
         "<!-- 1 -->\n",
         "<g class=\"node\" id=\"node2\"><title>1</title>\n",
-        "<ellipse cx=\"62.6978\" cy=\"-256\" fill=\"#ffffaa\" rx=\"24.8972\" ry=\"24.8972\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"62.6978\" y=\"-252.3\">init</text>\n",
+        "<ellipse cx=\"118\" cy=\"-250\" fill=\"#ffffaa\" rx=\"27\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"118\" y=\"-246.3\">init</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
         "<g class=\"edge\" id=\"edge1\"><title>0-&gt;1</title>\n",
-        "<path d=\"M1.04399,-256C1.93865,-256 16.3331,-256 30.8732,-256\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"37.9642,-256 30.9643,-259.15 34.4642,-256 30.9642,-256 30.9642,-256 30.9642,-256 34.4642,-256 30.9642,-252.85 37.9642,-256 37.9642,-256\" stroke=\"black\"/>\n",
+        "<path d=\"M54.2216,-250C63.4559,-250 73.9612,-250 83.7008,-250\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"90.9659,-250 83.9659,-253.15 87.4659,-250 83.9659,-250 83.9659,-250 83.9659,-250 87.4659,-250 83.9658,-246.85 90.9659,-250 90.9659,-250\" stroke=\"black\"/>\n",
         "</g>\n",
         "<!-- 2 -->\n",
         "<g class=\"node\" id=\"node3\"><title>2</title>\n",
-        "<ellipse cx=\"482.365\" cy=\"-190\" fill=\"#ffffaa\" rx=\"37.4533\" ry=\"37.4533\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"482.365\" y=\"-193.8\">1</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"482.365\" y=\"-178.8\">!a &amp; b</text>\n",
+        "<ellipse cx=\"539.969\" cy=\"-195\" fill=\"#ffffaa\" rx=\"37.4533\" ry=\"26.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"539.969\" y=\"-198.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"539.969\" y=\"-183.8\">!a &amp; b</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;2 -->\n",
         "<g class=\"edge\" id=\"edge2\"><title>1-&gt;2</title>\n",
-        "<path d=\"M80.0021,-274.105C115.083,-310.768 201.199,-388.632 283.106,-368 356.606,-349.486 378.744,-332.757 424.06,-272 434.518,-257.978 432.39,-251.576 442.06,-237 445.119,-232.388 448.559,-227.709 452.097,-223.181\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"456.612,-217.543 454.696,-224.976 454.424,-220.275 452.237,-223.008 452.237,-223.008 452.237,-223.008 454.424,-220.275 449.778,-221.039 456.612,-217.543 456.612,-217.543\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"264.606\" y=\"-374.8\">!a &amp; b</text>\n",
+        "<path d=\"M134.194,-264.679C169.197,-296.674 258.802,-368.267 340.711,-348 412.401,-330.261 429.922,-312.696 481.664,-260 490.758,-250.738 491.221,-246.86 499.664,-237 503.862,-232.098 508.445,-226.994 512.951,-222.103\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"517.79,-216.899 515.33,-224.171 515.406,-219.462 513.023,-222.026 513.023,-222.026 513.023,-222.026 515.406,-219.462 510.716,-219.881 517.79,-216.899 517.79,-216.899\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"322.211\" y=\"-354.8\">!a &amp; b</text>\n",
         "</g>\n",
         "<!-- 3 -->\n",
         "<g class=\"node\" id=\"node4\"><title>3</title>\n",
-        "<ellipse cx=\"192.751\" cy=\"-152\" fill=\"#ffffaa\" rx=\"35.2113\" ry=\"35.2113\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"192.751\" y=\"-155.8\">1</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"192.751\" y=\"-140.8\">a &amp; b</text>\n",
+        "<ellipse cx=\"250.355\" cy=\"-154\" fill=\"#ffffaa\" rx=\"35.2113\" ry=\"26.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"250.355\" y=\"-157.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"250.355\" y=\"-142.8\">a &amp; b</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;3 -->\n",
         "<g class=\"edge\" id=\"edge3\"><title>1-&gt;3</title>\n",
-        "<path d=\"M82.3178,-240.878C102.354,-224.605 134.612,-198.406 158.925,-178.66\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"164.609,-174.044 161.161,-180.902 161.892,-176.25 159.175,-178.457 159.175,-178.457 159.175,-178.457 161.892,-176.25 157.189,-176.012 164.609,-174.044 164.609,-174.044\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"122.396\" y=\"-223.8\">a &amp; b</text>\n",
+        "<path d=\"M136.852,-236.853C157.767,-221.45 192.789,-195.658 218.211,-176.936\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"224.127,-172.579 220.359,-179.267 221.309,-174.655 218.491,-176.73 218.491,-176.73 218.491,-176.73 221.309,-174.655 216.623,-174.194 224.127,-172.579 224.127,-172.579\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"180\" y=\"-220.8\">a &amp; b</text>\n",
         "</g>\n",
         "<!-- 4 -->\n",
         "<g class=\"node\" id=\"node5\"><title>4</title>\n",
-        "<ellipse cx=\"338.583\" cy=\"-205\" fill=\"#ffffaa\" rx=\"37.4533\" ry=\"37.4533\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"338.583\" y=\"-208.8\">1</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"338.583\" y=\"-193.8\">a &amp; !b</text>\n",
+        "<ellipse cx=\"396.187\" cy=\"-195\" fill=\"#ffffaa\" rx=\"37.4533\" ry=\"26.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"396.187\" y=\"-198.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"396.187\" y=\"-183.8\">a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;4 -->\n",
         "<g class=\"edge\" id=\"edge4\"><title>1-&gt;4</title>\n",
-        "<path d=\"M87.1814,-252.544C119.148,-247.749 178.107,-238.579 228.106,-229 250.158,-224.775 274.574,-219.483 294.742,-214.943\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"301.687,-213.372 295.555,-217.989 298.274,-214.145 294.86,-214.917 294.86,-214.917 294.86,-214.917 298.274,-214.145 294.165,-211.844 301.687,-213.372 301.687,-213.372\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"192.751\" y=\"-245.8\">a &amp; !b</text>\n",
+        "<path d=\"M144.886,-246.934C186.554,-241.693 270.897,-229.822 340.711,-212 345.355,-210.815 350.189,-209.47 354.975,-208.069\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"361.926,-205.988 356.124,-211.013 358.573,-206.992 355.22,-207.996 355.22,-207.996 355.22,-207.996 358.573,-206.992 354.317,-204.978 361.926,-205.988 361.926,-205.988\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"250.355\" y=\"-240.8\">a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 5 -->\n",
         "<g class=\"node\" id=\"node6\"><title>5</title>\n",
-        "<ellipse cx=\"628.025\" cy=\"-158\" fill=\"#ffffaa\" rx=\"35.2259\" ry=\"35.2259\" stroke=\"black\"/>\n",
-        "<ellipse cx=\"628.025\" cy=\"-158\" fill=\"none\" rx=\"39.2112\" ry=\"39.2112\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"628.025\" y=\"-161.8\">0</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"628.025\" y=\"-146.8\">a &amp; b</text>\n",
+        "<ellipse cx=\"685.63\" cy=\"-147\" fill=\"#ffffaa\" rx=\"35.2259\" ry=\"26.7574\" stroke=\"black\"/>\n",
+        "<ellipse cx=\"685.63\" cy=\"-147\" fill=\"none\" rx=\"39.2112\" ry=\"30.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"685.63\" y=\"-150.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"685.63\" y=\"-135.8\">a &amp; b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;5 -->\n",
         "<g class=\"edge\" id=\"edge5\"><title>2-&gt;5</title>\n",
-        "<path d=\"M519.246,-182.008C538.352,-177.752 562.03,-172.478 582.322,-167.958\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"589.345,-166.393 583.198,-170.99 585.929,-167.154 582.513,-167.915 582.513,-167.915 582.513,-167.915 585.929,-167.154 581.828,-164.84 589.345,-166.393 589.345,-166.393\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"555.67\" y=\"-180.8\">{a}</text>\n",
+        "<path d=\"M574.289,-183.867C594.558,-177.095 620.635,-168.382 642.349,-161.127\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"649.233,-158.827 643.592,-164.033 645.914,-159.936 642.594,-161.045 642.594,-161.045 642.594,-161.045 645.914,-159.936 641.596,-158.057 649.233,-158.827 649.233,-158.827\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"613.274\" y=\"-179.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 6 -->\n",
         "<g class=\"node\" id=\"node7\"><title>6</title>\n",
-        "<ellipse cx=\"774.857\" cy=\"-158\" fill=\"#ffffaa\" rx=\"37.4556\" ry=\"37.4556\" stroke=\"black\"/>\n",
-        "<ellipse cx=\"774.857\" cy=\"-158\" fill=\"none\" rx=\"41.4533\" ry=\"41.4533\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"774.857\" y=\"-161.8\">0</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"774.857\" y=\"-146.8\">!a &amp; b</text>\n",
+        "<ellipse cx=\"832.462\" cy=\"-148\" fill=\"#ffffaa\" rx=\"37.4556\" ry=\"26.7574\" stroke=\"black\"/>\n",
+        "<ellipse cx=\"832.462\" cy=\"-148\" fill=\"none\" rx=\"41.4533\" ry=\"30.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"832.462\" y=\"-151.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"832.462\" y=\"-136.8\">!a &amp; b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;6 -->\n",
         "<g class=\"edge\" id=\"edge6\"><title>2-&gt;6</title>\n",
-        "<path d=\"M514.661,-209.497C551.574,-229.937 614.593,-256.796 667.38,-239 694.942,-229.708 721.017,-210.125 740.465,-192.542\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"745.771,-187.646 742.763,-194.708 743.199,-190.02 740.627,-192.393 740.627,-192.393 740.627,-192.393 743.199,-190.02 738.49,-190.078 745.771,-187.646 745.771,-187.646\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"628.025\" y=\"-248.8\">{}</text>\n",
+        "<path d=\"M573.227,-207.569C610.507,-220.235 673.351,-235.819 724.985,-220 753.069,-211.396 780.422,-192.606 800.371,-176.378\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"805.796,-171.88 802.418,-178.773 803.102,-174.114 800.407,-176.348 800.407,-176.348 800.407,-176.348 803.102,-174.114 798.397,-173.923 805.796,-171.88 805.796,-171.88\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"685.63\" y=\"-230.8\">{}</text>\n",
         "</g>\n",
         "<!-- 7 -->\n",
         "<g class=\"node\" id=\"node8\"><title>7</title>\n",
-        "<ellipse cx=\"926.639\" cy=\"-61\" fill=\"#ffffaa\" rx=\"37.4556\" ry=\"37.4556\" stroke=\"black\"/>\n",
-        "<ellipse cx=\"926.639\" cy=\"-61\" fill=\"none\" rx=\"41.4533\" ry=\"41.4533\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"926.639\" y=\"-64.8\">0</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"926.639\" y=\"-49.8\">a &amp; !b</text>\n",
+        "<ellipse cx=\"984.243\" cy=\"-61\" fill=\"#ffffaa\" rx=\"37.4556\" ry=\"26.7574\" stroke=\"black\"/>\n",
+        "<ellipse cx=\"984.243\" cy=\"-61\" fill=\"none\" rx=\"41.4533\" ry=\"30.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"984.243\" y=\"-64.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"984.243\" y=\"-49.8\">a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;7 -->\n",
         "<g class=\"edge\" id=\"edge7\"><title>2-&gt;7</title>\n",
-        "<path d=\"M510.516,-164.88C530.742,-147.339 559.75,-124.548 588.67,-110 683.063,-62.5163 809.91,-57.452 877.879,-58.7202\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"885.07,-58.8824 878.001,-61.8737 881.571,-58.8034 878.072,-58.7245 878.072,-58.7245 878.072,-58.7245 881.571,-58.8034 878.143,-55.5753 885.07,-58.8824 885.07,-58.8824\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"700.38\" y=\"-80.8\">{a, b}</text>\n",
+        "<path d=\"M561.908,-172.669C581.815,-152.7 613.507,-124.033 646.274,-107 740.039,-58.2596 867.402,-55.1871 935.553,-57.7503\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"942.762,-58.051 935.637,-60.9064 939.265,-57.9051 935.768,-57.7592 935.768,-57.7592 935.768,-57.7592 939.265,-57.9051 935.9,-54.6119 942.762,-58.051 942.762,-58.051\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"757.985\" y=\"-76.8\">{a, b}</text>\n",
         "</g>\n",
         "<!-- 8 -->\n",
         "<g class=\"node\" id=\"node9\"><title>8</title>\n",
-        "<ellipse cx=\"926.639\" cy=\"-289\" fill=\"#ffffaa\" rx=\"40.1285\" ry=\"40.1285\" stroke=\"black\"/>\n",
-        "<ellipse cx=\"926.639\" cy=\"-289\" fill=\"none\" rx=\"44.111\" ry=\"44.111\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"926.639\" y=\"-292.8\">0</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"926.639\" y=\"-277.8\">!a &amp; !b</text>\n",
+        "<ellipse cx=\"984.243\" cy=\"-269\" fill=\"#ffffaa\" rx=\"40.1285\" ry=\"26.7574\" stroke=\"black\"/>\n",
+        "<ellipse cx=\"984.243\" cy=\"-269\" fill=\"none\" rx=\"44.111\" ry=\"30.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"984.243\" y=\"-272.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"984.243\" y=\"-257.8\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;8 -->\n",
         "<g class=\"edge\" id=\"edge8\"><title>2-&gt;8</title>\n",
-        "<path d=\"M508.636,-216.791C518.105,-225.87 529.33,-235.58 540.67,-243 560.155,-255.749 566.391,-257.228 588.67,-264 693.763,-295.945 724.494,-290.456 834.334,-291 847.667,-291.066 851.002,-291.217 864.334,-291 867.837,-290.943 871.453,-290.867 875.095,-290.779\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"882.106,-290.595 875.191,-293.928 878.607,-290.687 875.108,-290.779 875.108,-290.779 875.108,-290.779 878.607,-290.687 875.026,-287.63 882.106,-290.595 882.106,-290.595\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"700.38\" y=\"-292.8\">{b}</text>\n",
+        "<path d=\"M566.189,-214.259C575.831,-220.927 587.181,-227.979 598.274,-233 618.41,-242.113 624.663,-241.37 646.274,-246 709.952,-259.643 726.118,-263.23 790.985,-269 835.685,-272.976 847.063,-270.556 891.938,-271 905.271,-271.132 908.607,-271.217 921.938,-271 925.442,-270.943 929.058,-270.867 932.699,-270.779\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"939.71,-270.595 932.795,-273.928 936.211,-270.687 932.713,-270.779 932.713,-270.779 932.713,-270.779 936.211,-270.687 932.63,-267.63 939.71,-270.595 939.71,-270.595\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"757.985\" y=\"-271.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge14\"><title>3-&gt;2</title>\n",
-        "<path d=\"M227.758,-145.527C264.685,-139.647 325.2,-133.376 376.06,-144 399.22,-148.838 423.521,-159.065 442.935,-168.65\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"449.323,-171.868 441.655,-171.532 446.198,-170.293 443.072,-168.719 443.072,-168.719 443.072,-168.719 446.198,-170.293 444.489,-165.906 449.323,-171.868 449.323,-171.868\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"338.583\" y=\"-147.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge10\"><title>3-&gt;2</title>\n",
+        "<path d=\"M284.427,-146.736C321.317,-139.886 382.531,-132.27 433.664,-144 458.854,-149.779 485.017,-162.411 504.962,-173.657\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"511.211,-177.249 503.572,-176.491 508.176,-175.504 505.142,-173.76 505.142,-173.76 505.142,-173.76 508.176,-175.504 506.712,-171.029 511.211,-177.249 511.211,-177.249\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"396.187\" y=\"-147.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge13\"><title>3-&gt;3</title>\n",
-        "<path d=\"M179.627,-185.086C179.558,-196.323 183.933,-205.355 192.751,-205.355 199.64,-205.355 203.817,-199.843 205.282,-192.073\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"205.875,-185.086 208.422,-192.327 205.579,-188.574 205.283,-192.061 205.283,-192.061 205.283,-192.061 205.579,-188.574 202.145,-191.795 205.875,-185.086 205.875,-185.086\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"192.751\" y=\"-209.155\">{}</text>\n",
+        "<g class=\"edge\" id=\"edge9\"><title>3-&gt;3</title>\n",
+        "<path d=\"M237.346,-179.37C236.448,-189.924 240.785,-198.87 250.355,-198.87 257.683,-198.87 261.942,-193.626 263.133,-186.431\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"263.365,-179.37 266.284,-186.47 263.25,-182.868 263.135,-186.366 263.135,-186.366 263.135,-186.366 263.25,-182.868 259.987,-186.263 263.365,-179.37 263.365,-179.37\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"250.355\" y=\"-202.67\">{}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge15\"><title>3-&gt;4</title>\n",
-        "<path d=\"M222.222,-171.683C229.739,-176.234 238.017,-180.702 246.106,-184 261.284,-190.188 278.659,-194.756 294.16,-198.021\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"301.135,-199.43 293.65,-201.131 297.705,-198.737 294.274,-198.044 294.274,-198.044 294.274,-198.044 297.705,-198.737 294.898,-194.956 301.135,-199.43 301.135,-199.43\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"264.606\" y=\"-199.8\">{b}</text>\n",
+        "<g class=\"edge\" id=\"edge11\"><title>3-&gt;4</title>\n",
+        "<path d=\"M277.29,-171.585C285.43,-176.344 294.662,-181.001 303.711,-184 318.716,-188.973 335.769,-191.746 351.052,-193.276\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"358.396,-193.931 351.144,-196.446 354.91,-193.62 351.424,-193.309 351.424,-193.309 351.424,-193.309 354.91,-193.62 351.704,-190.171 358.396,-193.931 358.396,-193.931\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"322.211\" y=\"-196.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;5 -->\n",
-        "<g class=\"edge\" id=\"edge9\"><title>3-&gt;5</title>\n",
-        "<path d=\"M226.397,-140.622C232.858,-138.77 239.641,-137.1 246.106,-136 366.378,-115.533 510.752,-135.902 582.298,-148.943\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"589.408,-150.259 581.951,-152.082 585.966,-149.622 582.525,-148.985 582.525,-148.985 582.525,-148.985 585.966,-149.622 583.098,-145.887 589.408,-150.259 589.408,-150.259\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"409.06\" y=\"-133.8\">{}</text>\n",
+        "<g class=\"edge\" id=\"edge13\"><title>3-&gt;5</title>\n",
+        "<path d=\"M281.956,-141.797C288.997,-139.463 296.529,-137.335 303.711,-136 327.76,-131.531 334.264,-134.839 358.711,-134 400.02,-132.582 410.335,-131.667 451.664,-131 464.996,-130.785 468.341,-130.476 481.664,-131 535.973,-133.137 598.267,-138.48 639.36,-142.406\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"646.526,-143.096 639.256,-145.56 643.042,-142.761 639.559,-142.425 639.559,-142.425 639.559,-142.425 643.042,-142.761 639.861,-139.289 646.526,-143.096 646.526,-143.096\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"466.664\" y=\"-134.8\">{}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;6 -->\n",
-        "<g class=\"edge\" id=\"edge10\"><title>3-&gt;6</title>\n",
-        "<path d=\"M224.377,-135.817C231.353,-132.741 238.851,-129.896 246.106,-128 427.419,-80.611 484.163,-70.6112 667.38,-110 689.822,-114.825 713.237,-124.768 732.376,-134.36\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"738.695,-137.592 731.028,-137.209 735.579,-135.998 732.463,-134.405 732.463,-134.405 732.463,-134.405 735.579,-135.998 733.897,-131.6 738.695,-137.592 738.695,-137.592\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"482.365\" y=\"-91.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge14\"><title>3-&gt;6</title>\n",
+        "<path d=\"M279.776,-138.836C287.362,-135.387 295.687,-132.119 303.711,-130 485.008,-82.1242 540.631,-72.7326 724.985,-107 747.556,-111.196 771.514,-119.996 790.976,-128.371\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"797.396,-131.188 789.72,-131.26 794.191,-129.782 790.986,-128.375 790.986,-128.375 790.986,-128.375 794.191,-129.782 792.252,-125.491 797.396,-131.188 797.396,-131.188\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"539.969\" y=\"-92.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;7 -->\n",
-        "<g class=\"edge\" id=\"edge11\"><title>3-&gt;7</title>\n",
-        "<path d=\"M207.136,-119.392C227.894,-74.7296 272.369,-0 337.583,-0 337.583,-0 337.583,-0 775.857,-0 815.143,-0 856.228,-18.222 885.41,-34.7474\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"891.821,-38.4592 884.185,-37.6779 888.792,-36.7055 885.763,-34.9518 885.763,-34.9518 885.763,-34.9518 888.792,-36.7055 887.342,-32.2257 891.821,-38.4592 891.821,-38.4592\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"555.67\" y=\"-3.8\">{b}</text>\n",
+        "<g class=\"edge\" id=\"edge15\"><title>3-&gt;7</title>\n",
+        "<path d=\"M261.396,-128.224C280.358,-84.3838 325.861,-0 395.187,-0 395.187,-0 395.187,-0 833.462,-0 874.485,-0 917.471,-19.8698 946.816,-36.9288\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"952.866,-40.5182 945.238,-39.6552 949.856,-38.7322 946.846,-36.9462 946.846,-36.9462 946.846,-36.9462 949.856,-38.7322 948.453,-34.2371 952.866,-40.5182 952.866,-40.5182\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"613.274\" y=\"-3.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;8 -->\n",
-        "<g class=\"edge\" id=\"edge12\"><title>3-&gt;8</title>\n",
-        "<path d=\"M209.097,-183.411C215.207,-196.222 222.181,-211.233 228.106,-225 257.834,-294.071 262.386,-354 337.583,-354 337.583,-354 337.583,-354 775.857,-354 814.76,-354 854.998,-335.32 883.959,-317.988\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"889.963,-314.317 885.634,-320.656 886.977,-316.142 883.991,-317.968 883.991,-317.968 883.991,-317.968 886.977,-316.142 882.348,-315.281 889.963,-314.317 889.963,-314.317\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"555.67\" y=\"-357.8\">{a, b}</text>\n",
+        "<g class=\"edge\" id=\"edge16\"><title>3-&gt;8</title>\n",
+        "<path d=\"M264.11,-178.915C278.761,-207.451 301.126,-250.719 303.711,-254 337.135,-296.426 341.177,-334 395.187,-334 395.187,-334 395.187,-334 833.462,-334 874.746,-334 917.534,-312.962 946.753,-294.824\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"952.777,-291.006 948.551,-297.414 949.821,-292.88 946.864,-294.754 946.864,-294.754 946.864,-294.754 949.821,-292.88 945.178,-292.093 952.777,-291.006 952.777,-291.006\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"613.274\" y=\"-337.8\">{a, b}</text>\n",
         "</g>\n",
         "<!-- 9 -->\n",
         "<g class=\"node\" id=\"node10\"><title>9</title>\n",
-        "<ellipse cx=\"482.365\" cy=\"-286\" fill=\"#ffffaa\" rx=\"40.1111\" ry=\"40.1111\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"482.365\" y=\"-289.8\">1</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"482.365\" y=\"-274.8\">!a &amp; !b</text>\n",
+        "<ellipse cx=\"539.969\" cy=\"-273\" fill=\"#ffffaa\" rx=\"40.1111\" ry=\"26.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"539.969\" y=\"-276.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"539.969\" y=\"-261.8\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;9 -->\n",
-        "<g class=\"edge\" id=\"edge16\"><title>3-&gt;9</title>\n",
-        "<path d=\"M208.952,-183.615C226.27,-215.577 257.875,-263.141 301.106,-284 343.123,-304.273 397.325,-301.615 435.276,-295.857\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"442.641,-294.67 436.231,-298.894 439.186,-295.227 435.73,-295.784 435.73,-295.784 435.73,-295.784 439.186,-295.227 435.229,-292.674 442.641,-294.67 442.641,-294.67\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"338.583\" y=\"-302.8\">{a, b}</text>\n",
+        "<g class=\"edge\" id=\"edge12\"><title>3-&gt;9</title>\n",
+        "<path d=\"M266.4,-178.295C284.53,-205.019 317.728,-246.497 358.711,-264 401.529,-282.287 455.372,-282.377 493.015,-279.234\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"500.32,-278.566 493.635,-282.34 496.834,-278.885 493.349,-279.203 493.349,-279.203 493.349,-279.203 496.834,-278.885 493.062,-276.066 500.32,-278.566 500.32,-278.566\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"396.187\" y=\"-283.8\">{a, b}</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;2 -->\n",
         "<g class=\"edge\" id=\"edge18\"><title>4-&gt;2</title>\n",
-        "<path d=\"M376.095,-201.137C394.949,-199.143 418.082,-196.695 437.857,-194.603\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"444.976,-193.85 438.346,-197.719 441.496,-194.218 438.015,-194.586 438.015,-194.586 438.015,-194.586 441.496,-194.218 437.684,-191.454 444.976,-193.85 444.976,-193.85\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"409.06\" y=\"-202.8\">{a, b}</text>\n",
+        "<path d=\"M433.7,-195C452.407,-195 475.328,-195 495.001,-195\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"502.088,-195 495.088,-198.15 498.588,-195 495.088,-195 495.088,-195 495.088,-195 498.588,-195 495.088,-191.85 502.088,-195 502.088,-195\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"466.664\" y=\"-198.8\">{a, b}</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;3 -->\n",
         "<g class=\"edge\" id=\"edge17\"><title>4-&gt;3</title>\n",
-        "<path d=\"M309.772,-180.571C301.655,-174.596 292.444,-168.826 283.106,-165 268.272,-158.921 251.03,-155.624 235.672,-153.857\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"228.302,-153.107 235.585,-150.682 231.784,-153.461 235.266,-153.816 235.266,-153.816 235.266,-153.816 231.784,-153.461 234.947,-156.95 228.302,-153.107 228.302,-153.107\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"264.606\" y=\"-168.8\">{b}</text>\n",
+        "<path d=\"M367.838,-177.29C359.434,-172.587 349.956,-167.991 340.711,-165 325.63,-160.121 308.477,-157.381 293.258,-155.851\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"285.96,-155.193 293.215,-152.685 289.446,-155.508 292.932,-155.822 292.932,-155.822 292.932,-155.822 289.446,-155.508 292.649,-158.959 285.96,-155.193 285.96,-155.193\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"322.211\" y=\"-168.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;4 -->\n",
         "<g class=\"edge\" id=\"edge19\"><title>4-&gt;4</title>\n",
-        "<path d=\"M325.461,-240.213C325.596,-251.517 329.97,-260.477 338.583,-260.477 345.312,-260.477 349.454,-255.008 351.008,-247.226\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"351.705,-240.213 354.147,-247.49 351.359,-243.696 351.012,-247.179 351.012,-247.179 351.012,-247.179 351.359,-243.696 347.878,-246.867 351.705,-240.213 351.705,-240.213\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"338.583\" y=\"-264.277\">{}</text>\n",
+        "<path d=\"M383.178,-220.37C382.28,-230.924 386.617,-239.87 396.187,-239.87 403.515,-239.87 407.774,-234.626 408.965,-227.431\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"409.197,-220.37 412.116,-227.47 409.082,-223.868 408.967,-227.366 408.967,-227.366 408.967,-227.366 409.082,-223.868 405.819,-227.263 409.197,-220.37 409.197,-220.37\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"396.187\" y=\"-243.67\">{}</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;9 -->\n",
         "<g class=\"edge\" id=\"edge20\"><title>4-&gt;9</title>\n",
-        "<path d=\"M371.402,-223.178C391.924,-234.903 418.8,-250.257 440.845,-262.851\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"446.925,-266.325 439.285,-265.587 443.886,-264.589 440.847,-262.852 440.847,-262.852 440.847,-262.852 443.886,-264.589 442.41,-260.117 446.925,-266.325 446.925,-266.325\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"409.06\" y=\"-256.8\">{a}</text>\n",
+        "<path d=\"M426.565,-211.162C448.455,-223.204 478.5,-239.733 502.02,-252.673\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"508.158,-256.05 500.507,-255.435 505.092,-254.363 502.025,-252.675 502.025,-252.675 502.025,-252.675 505.092,-254.363 503.543,-249.916 508.158,-256.05 508.158,-256.05\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"466.664\" y=\"-244.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 5&#45;&gt;5 -->\n",
         "<g class=\"edge\" id=\"edge21\"><title>5-&gt;5</title>\n",
-        "<path d=\"M614.546,-195.236C614.884,-206.528 619.377,-215.355 628.025,-215.355 634.782,-215.355 639.002,-209.968 640.686,-202.226\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"641.505,-195.236 643.819,-202.555 641.098,-198.712 640.691,-202.189 640.691,-202.189 640.691,-202.189 641.098,-198.712 637.562,-201.822 641.505,-195.236 641.505,-195.236\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"628.025\" y=\"-219.155\">{}</text>\n",
+        "<path d=\"M672.159,-176.099C671.718,-186.944 676.208,-195.87 685.63,-195.87 692.843,-195.87 697.166,-190.638 698.598,-183.318\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"699.1,-176.099 701.756,-183.301 698.857,-179.591 698.614,-183.082 698.614,-183.082 698.614,-183.082 698.857,-179.591 695.472,-182.864 699.1,-176.099 699.1,-176.099\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"685.63\" y=\"-199.67\">{}</text>\n",
         "</g>\n",
         "<!-- 5&#45;&gt;6 -->\n",
         "<g class=\"edge\" id=\"edge22\"><title>5-&gt;6</title>\n",
-        "<path d=\"M666.037,-146.689C672.431,-145.156 679.056,-143.827 685.38,-143 698.601,-141.271 702.152,-141.33 715.38,-143 719.444,-143.513 723.629,-144.219 727.805,-145.047\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"734.8,-146.543 727.296,-148.159 731.377,-145.811 727.955,-145.078 727.955,-145.078 727.955,-145.078 731.377,-145.811 728.613,-141.998 734.8,-146.543 734.8,-146.543\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"700.38\" y=\"-146.8\">{a}</text>\n",
+        "<path d=\"M723.792,-139.455C730.169,-138.433 736.749,-137.549 742.985,-137 756.267,-135.831 759.709,-135.762 772.985,-137 777.004,-137.375 781.159,-137.891 785.315,-138.498\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"792.284,-139.594 784.88,-141.618 788.827,-139.05 785.369,-138.506 785.369,-138.506 785.369,-138.506 788.827,-139.05 785.859,-135.395 792.284,-139.594 792.284,-139.594\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"757.985\" y=\"-140.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 5&#45;&gt;7 -->\n",
         "<g class=\"edge\" id=\"edge23\"><title>5-&gt;7</title>\n",
-        "<path d=\"M659.754,-134.347C679.693,-120.18 706.822,-103.027 733.38,-93 780.616,-75.1666 838.104,-67.2507 877.845,-63.7498\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"885.052,-63.146 878.34,-66.8694 881.565,-63.4382 878.077,-63.7304 878.077,-63.7304 878.077,-63.7304 881.565,-63.4382 877.814,-60.5914 885.052,-63.146 885.052,-63.146\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"774.857\" y=\"-96.8\">{b}</text>\n",
+        "<path d=\"M717.018,-128.04C737.263,-116.236 764.855,-101.695 790.985,-93 838.741,-77.1092 895.906,-68.8814 935.425,-64.7764\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"942.593,-64.057 935.942,-67.8904 939.11,-64.4066 935.628,-64.7562 935.628,-64.7562 935.628,-64.7562 939.11,-64.4066 935.313,-61.6219 942.593,-64.057 942.593,-64.057\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"832.462\" y=\"-96.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 5&#45;&gt;8 -->\n",
         "<g class=\"edge\" id=\"edge24\"><title>5-&gt;8</title>\n",
-        "<path d=\"M656.84,-185.638C676.645,-203.852 704.731,-226.867 733.38,-241 778.691,-263.352 835.286,-275.855 875.308,-282.454\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"882.581,-283.618 875.171,-285.622 879.125,-283.065 875.669,-282.512 875.669,-282.512 875.669,-282.512 879.125,-283.065 876.167,-279.401 882.581,-283.618 882.581,-283.618\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"774.857\" y=\"-274.8\">{a, b}</text>\n",
+        "<path d=\"M712.809,-169.774C732.946,-186.203 762.126,-207.739 790.985,-221 836.894,-242.096 893.401,-254.784 933.238,-261.769\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"940.477,-263.007 933.046,-264.932 937.027,-262.417 933.577,-261.827 933.577,-261.827 933.577,-261.827 937.027,-262.417 934.108,-258.722 940.477,-263.007 940.477,-263.007\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"832.462\" y=\"-253.8\">{a, b}</text>\n",
         "</g>\n",
         "<!-- 6&#45;&gt;5 -->\n",
         "<g class=\"edge\" id=\"edge25\"><title>6-&gt;5</title>\n",
-        "<path d=\"M733.217,-158C715.031,-158 693.51,-158 674.762,-158\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"667.457,-158 674.457,-154.85 670.957,-158 674.457,-158 674.457,-158 674.457,-158 670.957,-158 674.457,-161.15 667.457,-158 667.457,-158\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"700.38\" y=\"-161.8\">{a}</text>\n",
+        "<path d=\"M790.94,-151.354C775.882,-152.2 758.653,-152.694 742.985,-152 739.397,-151.841 735.685,-151.626 731.956,-151.373\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"724.795,-150.846 732.007,-148.218 728.286,-151.103 731.776,-151.36 731.776,-151.36 731.776,-151.36 728.286,-151.103 731.545,-154.501 724.795,-150.846 724.795,-150.846\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"757.985\" y=\"-156.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 6&#45;&gt;6 -->\n",
         "<g class=\"edge\" id=\"edge26\"><title>6-&gt;6</title>\n",
-        "<path d=\"M761.024,-197.182C761.502,-208.618 766.113,-217.477 774.857,-217.477 781.688,-217.477 785.997,-212.07 787.784,-204.251\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"788.691,-197.182 790.924,-204.526 788.245,-200.654 787.8,-204.125 787.8,-204.125 787.8,-204.125 788.245,-200.654 784.675,-203.724 788.691,-197.182 788.691,-197.182\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"774.857\" y=\"-221.277\">{}</text>\n",
+        "<path d=\"M818.6,-177.584C818.302,-188.208 822.922,-196.87 832.462,-196.87 839.765,-196.87 844.185,-191.793 845.722,-184.644\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"846.323,-177.584 848.868,-184.825 846.026,-181.071 845.729,-184.558 845.729,-184.558 845.729,-184.558 846.026,-181.071 842.591,-184.291 846.323,-177.584 846.323,-177.584\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"832.462\" y=\"-200.67\">{}</text>\n",
         "</g>\n",
         "<!-- 6&#45;&gt;7 -->\n",
         "<g class=\"edge\" id=\"edge27\"><title>6-&gt;7</title>\n",
-        "<path d=\"M810.22,-135.746C832.578,-121.267 861.832,-102.322 885.294,-87.1277\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"891.436,-83.1502 887.273,-89.5993 888.498,-85.0527 885.56,-86.9553 885.56,-86.9553 885.56,-86.9553 888.498,-85.0527 883.848,-84.3113 891.436,-83.1502 891.436,-83.1502\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"849.334\" y=\"-122.8\">{a, b}</text>\n",
+        "<path d=\"M866.363,-129.701C883.073,-120.333 903.657,-108.68 921.938,-98 929.486,-93.591 937.512,-88.8128 945.184,-84.2007\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"951.528,-80.3775 947.159,-86.6888 948.53,-82.1842 945.533,-83.9909 945.533,-83.9909 945.533,-83.9909 948.53,-82.1842 943.907,-81.293 951.528,-80.3775 951.528,-80.3775\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"906.938\" y=\"-118.8\">{a, b}</text>\n",
         "</g>\n",
         "<!-- 6&#45;&gt;8 -->\n",
         "<g class=\"edge\" id=\"edge28\"><title>6-&gt;8</title>\n",
-        "<path d=\"M806.529,-184.826C829.843,-205.216 862.064,-233.397 887.115,-255.307\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"892.669,-260.165 885.327,-257.927 890.035,-257.861 887.4,-255.556 887.4,-255.556 887.4,-255.556 890.035,-257.861 889.474,-253.185 892.669,-260.165 892.669,-260.165\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"849.334\" y=\"-239.8\">{b}</text>\n",
+        "<path d=\"M861.401,-170.328C878.835,-184.283 901.727,-202.649 921.938,-219 930.869,-226.225 940.508,-234.066 949.439,-241.35\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"954.896,-245.802 947.481,-243.818 952.184,-243.59 949.473,-241.377 949.473,-241.377 949.473,-241.377 952.184,-243.59 951.464,-238.936 954.896,-245.802 954.896,-245.802\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"906.938\" y=\"-222.8\">{b}</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7f2e80d6fc50>"
+        "<IPython.core.display.SVG object>"
        ]
       }
      ],
@@ -386,124 +402,124 @@
        "output_type": "pyout",
        "prompt_number": 4,
        "svg": [
-        "<svg height=\"161pt\" viewBox=\"0.00 0.00 715.35 161.00\" width=\"715pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 157)\">\n",
+        "<svg height=\"138pt\" viewBox=\"0.00 0.00 734.00 137.69\" width=\"734pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g class=\"graph\" id=\"graph0\" transform=\"scale(0.949605 0.949605) rotate(0) translate(4 141)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" points=\"-4,4 -4,-157 711.349,-157 711.349,4 -4,4\" stroke=\"none\"/>\n",
+        "<polygon fill=\"white\" points=\"-4,4 -4,-141 768.953,-141 768.953,4 -4,4\" stroke=\"none\"/>\n",
         "<!-- 0 -->\n",
         "<!-- 1 -->\n",
         "<g class=\"node\" id=\"node2\"><title>1</title>\n",
-        "<ellipse cx=\"62.6978\" cy=\"-68\" fill=\"#ffffaa\" rx=\"24.8972\" ry=\"24.8972\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"62.6978\" y=\"-64.3\">init</text>\n",
+        "<ellipse cx=\"118\" cy=\"-60\" fill=\"#ffffaa\" rx=\"27\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"118\" y=\"-56.3\">init</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
         "<g class=\"edge\" id=\"edge1\"><title>0-&gt;1</title>\n",
-        "<path d=\"M1.04399,-68C1.93865,-68 16.3331,-68 30.8732,-68\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"37.9642,-68 30.9643,-71.1501 34.4642,-68 30.9642,-68.0001 30.9642,-68.0001 30.9642,-68.0001 34.4642,-68 30.9642,-64.8501 37.9642,-68 37.9642,-68\" stroke=\"black\"/>\n",
+        "<path d=\"M54.2216,-60C63.4559,-60 73.9612,-60 83.7008,-60\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"90.9659,-60 83.9659,-63.1501 87.4659,-60 83.9659,-60.0001 83.9659,-60.0001 83.9659,-60.0001 87.4659,-60 83.9658,-56.8501 90.9659,-60 90.9659,-60\" stroke=\"black\"/>\n",
         "</g>\n",
         "<!-- 2 -->\n",
         "<g class=\"node\" id=\"node3\"><title>2</title>\n",
-        "<polygon fill=\"#ffffaa\" points=\"479.349,-148 425.349,-148 425.349,-110 479.349,-110 479.349,-148\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"452.349\" y=\"-132.8\">1</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"452.349\" y=\"-117.8\">!a &amp; b</text>\n",
+        "<polygon fill=\"#ffffaa\" points=\"536.953,-131 482.953,-131 482.953,-93 536.953,-93 536.953,-131\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"509.953\" y=\"-115.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"509.953\" y=\"-100.8\">!a &amp; b</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;2 -->\n",
         "<g class=\"edge\" id=\"edge2\"><title>1-&gt;2</title>\n",
-        "<path d=\"M85.1066,-78.4223C91.5527,-81.3783 98.6955,-84.476 105.396,-87 183.158,-116.294 202.189,-128.87 284.396,-141 317.351,-145.863 326.044,-141.694 359.349,-141 380.696,-140.555 386.184,-141.822 407.349,-139 410.85,-138.533 414.484,-137.92 418.093,-137.228\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"424.966,-135.815 418.744,-140.31 421.537,-136.52 418.109,-137.225 418.109,-137.225 418.109,-137.225 421.537,-136.52 417.475,-134.139 424.966,-135.815 424.966,-135.815\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-141.8\">!a &amp; b</text>\n",
+        "<path d=\"M140.661,-70.1783C147.693,-73.2591 155.593,-76.488 163,-79 240.685,-105.346 260.59,-113.924 342,-124 375.06,-128.092 383.648,-124.694 416.953,-124 438.301,-123.555 443.789,-124.822 464.953,-122 468.455,-121.533 472.088,-120.92 475.698,-120.228\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"482.57,-118.815 476.348,-123.31 479.142,-119.52 475.714,-120.225 475.714,-120.225 475.714,-120.225 479.142,-119.52 475.079,-117.139 482.57,-118.815 482.57,-118.815\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-125.8\">!a &amp; b</text>\n",
         "</g>\n",
         "<!-- 3 -->\n",
         "<g class=\"node\" id=\"node4\"><title>3</title>\n",
-        "<polygon fill=\"#ffffaa\" points=\"211.396,-87 157.396,-87 157.396,-49 211.396,-49 211.396,-87\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"184.396\" y=\"-71.8\">1</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"184.396\" y=\"-56.8\">a &amp; b</text>\n",
+        "<polygon fill=\"#ffffaa\" points=\"269,-79 215,-79 215,-41 269,-41 269,-79\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"242\" y=\"-63.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"242\" y=\"-48.8\">a &amp; b</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;3 -->\n",
         "<g class=\"edge\" id=\"edge3\"><title>1-&gt;3</title>\n",
-        "<path d=\"M87.6328,-68C105.497,-68 130.135,-68 149.947,-68\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"157.006,-68 150.006,-71.1501 153.506,-68 150.006,-68.0001 150.006,-68.0001 150.006,-68.0001 153.506,-68 150.006,-64.8501 157.006,-68 157.006,-68\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"122.396\" y=\"-71.8\">a &amp; b</text>\n",
+        "<path d=\"M145.172,-60C163.505,-60 188.15,-60 207.856,-60\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"214.871,-60 207.871,-63.1501 211.371,-60 207.871,-60.0001 207.871,-60.0001 207.871,-60.0001 211.371,-60 207.871,-56.8501 214.871,-60 214.871,-60\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"180\" y=\"-63.8\">a &amp; b</text>\n",
         "</g>\n",
         "<!-- 4 -->\n",
         "<g class=\"node\" id=\"node5\"><title>4</title>\n",
-        "<ellipse cx=\"321.872\" cy=\"-65\" fill=\"#ffffaa\" rx=\"37.4533\" ry=\"37.4533\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"321.872\" y=\"-68.8\">1</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"321.872\" y=\"-53.8\">a &amp; !b</text>\n",
+        "<ellipse cx=\"379.477\" cy=\"-55\" fill=\"#ffffaa\" rx=\"37.4533\" ry=\"26.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"379.477\" y=\"-58.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"379.477\" y=\"-43.8\">a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;4 -->\n",
         "<g class=\"edge\" id=\"edge4\"><title>1-&gt;4</title>\n",
-        "<path d=\"M84.3656,-55.3514C102.769,-44.8778 130.817,-30.8075 157.396,-25 199.902,-15.7122 248.27,-30.763 281.299,-44.9807\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"288.106,-47.9929 280.43,-48.041 284.905,-46.5767 281.705,-45.1604 281.705,-45.1604 281.705,-45.1604 284.905,-46.5767 282.979,-42.2798 288.106,-47.9929 288.106,-47.9929\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"184.396\" y=\"-28.8\">a &amp; !b</text>\n",
+        "<path d=\"M138.748,-48.1679C157.586,-37.6194 187.14,-22.9544 215,-17 258.628,-7.67553 308.546,-23.0974 341.624,-37.0003\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"348.418,-39.9345 340.743,-40.0511 345.205,-38.5469 341.992,-37.1593 341.992,-37.1593 341.992,-37.1593 345.205,-38.5469 343.241,-34.2674 348.418,-39.9345 348.418,-39.9345\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"242\" y=\"-20.8\">a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 5 -->\n",
         "<g class=\"node\" id=\"node6\"><title>5</title>\n",
-        "<polygon fill=\"#ffffaa\" points=\"589.349,-123 535.349,-123 535.349,-85 589.349,-85 589.349,-123\" stroke=\"black\"/>\n",
-        "<polygon fill=\"none\" points=\"593.349,-127 531.349,-127 531.349,-81 593.349,-81 593.349,-127\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"562.349\" y=\"-107.8\">0</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"562.349\" y=\"-92.8\">a &amp; b</text>\n",
+        "<polygon fill=\"#ffffaa\" points=\"646.953,-113 592.953,-113 592.953,-75 646.953,-75 646.953,-113\" stroke=\"black\"/>\n",
+        "<polygon fill=\"none\" points=\"650.953,-117 588.953,-117 588.953,-71 650.953,-71 650.953,-117\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"619.953\" y=\"-97.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"619.953\" y=\"-82.8\">a &amp; b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;5 -->\n",
         "<g class=\"edge\" id=\"edge5\"><title>2-&gt;5</title>\n",
-        "<path d=\"M479.493,-122.948C492.905,-119.844 509.474,-116.008 524.19,-112.602\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"531.242,-110.969 525.133,-115.617 527.833,-111.758 524.423,-112.548 524.423,-112.548 524.423,-112.548 527.833,-111.758 523.712,-109.479 531.242,-110.969 531.242,-110.969\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"505.349\" y=\"-121.8\">{a}</text>\n",
+        "<path d=\"M537.097,-107.643C550.509,-105.407 567.079,-102.646 581.794,-100.193\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"588.847,-99.0177 582.46,-103.276 585.394,-99.5932 581.942,-100.169 581.942,-100.169 581.942,-100.169 585.394,-99.5932 581.424,-97.0615 588.847,-99.0177 588.847,-99.0177\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"562.953\" y=\"-108.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;2</title>\n",
-        "<path d=\"M211.569,-81.698C231.123,-91.3492 258.782,-103.791 284.396,-111 324.55,-122.302 335.856,-119.702 377.349,-124 390.625,-125.375 405.282,-126.456 418.026,-127.256\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"425.283,-127.695 418.105,-130.417 421.789,-127.484 418.295,-127.273 418.295,-127.273 418.295,-127.273 421.789,-127.484 418.485,-124.128 425.283,-127.695 425.283,-127.695\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"321.872\" y=\"-125.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge6\"><title>3-&gt;2</title>\n",
+        "<path d=\"M269.277,-71.5305C275.054,-73.8451 281.184,-76.1356 287,-78 351.879,-98.7976 431.62,-107.045 475.691,-110.185\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"482.711,-110.663 475.513,-113.33 479.219,-110.425 475.728,-110.187 475.728,-110.187 475.728,-110.187 479.219,-110.425 475.942,-107.044 482.711,-110.663 482.711,-110.663\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"379.477\" y=\"-108.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;4</title>\n",
-        "<path d=\"M211.405,-55.4294C217.198,-53.1796 223.403,-51.1784 229.396,-50 245.554,-46.8226 263.411,-48.582 279.026,-51.8391\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"286.029,-53.4287 278.505,-54.951 282.616,-52.6539 279.203,-51.8791 279.203,-51.8791 279.203,-51.8791 282.616,-52.6539 279.9,-48.8073 286.029,-53.4287 286.029,-53.4287\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-53.8\">{b}</text>\n",
+        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;4</title>\n",
+        "<path d=\"M269.009,-47.4294C274.803,-45.1796 281.007,-43.1784 287,-42 303.379,-38.7793 321.557,-40.3251 337.366,-43.2944\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"344.448,-44.7469 336.957,-46.4261 341.019,-44.0436 337.59,-43.3404 337.59,-43.3404 337.59,-43.3404 341.019,-44.0436 338.223,-40.2546 344.448,-44.7469 344.448,-44.7469\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-45.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 6 -->\n",
         "<g class=\"node\" id=\"node7\"><title>6</title>\n",
-        "<polygon fill=\"#ffffaa\" points=\"703.349,-85 649.349,-85 649.349,-47 703.349,-47 703.349,-85\" stroke=\"black\"/>\n",
-        "<polygon fill=\"none\" points=\"707.349,-89 645.349,-89 645.349,-43 707.349,-43 707.349,-89\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"676.349\" y=\"-69.8\">0</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"676.349\" y=\"-54.8\">!a &amp; b</text>\n",
+        "<polygon fill=\"#ffffaa\" points=\"760.953,-75 706.953,-75 706.953,-37 760.953,-37 760.953,-75\" stroke=\"black\"/>\n",
+        "<polygon fill=\"none\" points=\"764.953,-79 702.953,-79 702.953,-33 764.953,-33 764.953,-79\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"733.953\" y=\"-59.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"733.953\" y=\"-44.8\">!a &amp; b</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;6 -->\n",
-        "<g class=\"edge\" id=\"edge6\"><title>3-&gt;6</title>\n",
-        "<path d=\"M207.657,-48.6958C233.192,-28.592 277.186,-0 320.872,-0 320.872,-0 320.872,-0 563.349,-0 595.255,-0 626.076,-20.1262 647.282,-38.1505\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"652.73,-42.9164 645.387,-40.6786 650.096,-40.612 647.461,-38.3076 647.461,-38.3076 647.461,-38.3076 650.096,-40.612 649.535,-35.9367 652.73,-42.9164 652.73,-42.9164\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"452.349\" y=\"-3.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;6</title>\n",
+        "<path d=\"M268.995,-40.6854C295.22,-23.1454 337.576,-0 378.477,-0 378.477,-0 378.477,-0 620.953,-0 649.369,-0 677.966,-14.5993 699.151,-28.8894\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"704.923,-32.8993 697.377,-31.4926 702.049,-30.9025 699.174,-28.9056 699.174,-28.9056 699.174,-28.9056 702.049,-30.9025 700.971,-26.3186 704.923,-32.8993 704.923,-32.8993\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"509.953\" y=\"-3.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;2 -->\n",
         "<g class=\"edge\" id=\"edge10\"><title>4-&gt;2</title>\n",
-        "<path d=\"M355.625,-81.3155C374.995,-90.9647 399.44,-103.142 418.778,-112.775\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"425.126,-115.937 417.456,-115.635 421.993,-114.376 418.86,-112.816 418.86,-112.816 418.86,-112.816 421.993,-114.376 420.265,-109.996 425.126,-115.937 425.126,-115.937\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"392.349\" y=\"-109.8\">{a, b}</text>\n",
+        "<path d=\"M412.887,-67.1768C428.742,-73.3526 448.013,-81.1868 464.953,-89 468.664,-90.7114 472.509,-92.5777 476.312,-94.4828\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"482.64,-97.7051 474.973,-97.3358 479.521,-96.117 476.402,-94.5288 476.402,-94.5288 476.402,-94.5288 479.521,-96.117 477.831,-91.7217 482.64,-97.7051 482.64,-97.7051\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"449.953\" y=\"-92.8\">{a, b}</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;3 -->\n",
         "<g class=\"edge\" id=\"edge9\"><title>4-&gt;3</title>\n",
-        "<path d=\"M284.333,-65.8091C263.851,-66.2627 238.5,-66.824 218.588,-67.265\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"211.517,-67.4216 218.445,-64.1173 215.016,-67.344 218.515,-67.2665 218.515,-67.2665 218.515,-67.2665 215.016,-67.344 218.585,-70.4157 211.517,-67.4216 211.517,-67.4216\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-70.8\">{b}</text>\n",
+        "<path d=\"M341.937,-56.3485C321.456,-57.1045 296.105,-58.0401 276.192,-58.775\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"269.121,-59.0359 276,-55.6298 272.619,-58.9068 276.117,-58.7777 276.117,-58.7777 276.117,-58.7777 272.619,-58.9068 276.233,-61.9255 269.121,-59.0359 269.121,-59.0359\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-62.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 5&#45;&gt;6 -->\n",
         "<g class=\"edge\" id=\"edge11\"><title>5-&gt;6</title>\n",
-        "<path d=\"M587.188,-80.8632C594.396,-75.2601 602.707,-70.0196 611.349,-67 619.709,-64.0787 629.067,-62.8793 637.99,-62.6129\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"645.027,-62.5842 638.04,-65.7628 641.527,-62.5985 638.027,-62.6128 638.027,-62.6128 638.027,-62.6128 641.527,-62.5985 638.014,-59.4629 645.027,-62.5842 645.027,-62.5842\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"619.349\" y=\"-70.8\">{a}</text>\n",
+        "<path d=\"M644.792,-70.8632C652,-65.2601 660.312,-60.0196 668.953,-57 677.314,-54.0787 686.671,-52.8793 695.595,-52.6129\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"702.631,-52.5842 695.644,-55.7628 699.131,-52.5985 695.631,-52.6128 695.631,-52.6128 695.631,-52.6128 699.131,-52.5985 695.618,-49.4629 702.631,-52.5842 702.631,-52.5842\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"676.953\" y=\"-60.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 6&#45;&gt;5 -->\n",
         "<g class=\"edge\" id=\"edge12\"><title>6-&gt;5</title>\n",
-        "<path d=\"M645.252,-76.2114C631.432,-80.9005 614.911,-86.5056 600.339,-91.4496\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"593.363,-93.8167 598.98,-88.5846 596.677,-92.6921 599.992,-91.5676 599.992,-91.5676 599.992,-91.5676 596.677,-92.6921 601.004,-94.5505 593.363,-93.8167 593.363,-93.8167\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"619.349\" y=\"-90.8\">{a}</text>\n",
+        "<path d=\"M702.857,-66.2114C689.036,-70.9005 672.516,-76.5056 657.944,-81.4496\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"650.967,-83.8167 656.584,-78.5846 654.282,-82.6921 657.596,-81.5676 657.596,-81.5676 657.596,-81.5676 654.282,-82.6921 658.608,-84.5505 650.967,-83.8167 650.967,-83.8167\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"676.953\" y=\"-81.8\">{a}</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7f2e89e119b0>"
+        "<IPython.core.display.SVG object>"
        ]
       }
      ],
@@ -530,122 +546,114 @@
        "output_type": "pyout",
        "prompt_number": 5,
        "svg": [
-        "<svg height=\"178pt\" viewBox=\"0.00 0.00 562.40 178.00\" width=\"562pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 174)\">\n",
+        "<svg height=\"175pt\" viewBox=\"0.00 0.00 638.00 175.00\" width=\"638pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 171)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" points=\"-4,4 -4,-174 558.396,-174 558.396,4 -4,4\" stroke=\"none\"/>\n",
+        "<polygon fill=\"white\" points=\"-4,4 -4,-171 634,-171 634,4 -4,4\" stroke=\"none\"/>\n",
         "<!-- 0 -->\n",
         "<!-- 1 -->\n",
         "<g class=\"node\" id=\"node2\"><title>1</title>\n",
-        "<ellipse cx=\"62.6978\" cy=\"-144\" fill=\"#ffffaa\" rx=\"24.8972\" ry=\"24.8972\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"62.6978\" y=\"-140.3\">init</text>\n",
+        "<ellipse cx=\"118\" cy=\"-144\" fill=\"#ffffaa\" rx=\"27\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"118\" y=\"-140.3\">init</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
         "<g class=\"edge\" id=\"edge1\"><title>0-&gt;1</title>\n",
-        "<path d=\"M1.04399,-144C1.93865,-144 16.3331,-144 30.8732,-144\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"37.9642,-144 30.9643,-147.15 34.4642,-144 30.9642,-144 30.9642,-144 30.9642,-144 34.4642,-144 30.9642,-140.85 37.9642,-144 37.9642,-144\" stroke=\"black\"/>\n",
+        "<path d=\"M54.2216,-144C63.4559,-144 73.9612,-144 83.7008,-144\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"90.9659,-144 83.9659,-147.15 87.4659,-144 83.9659,-144 83.9659,-144 83.9659,-144 87.4659,-144 83.9658,-140.85 90.9659,-144 90.9659,-144\" stroke=\"black\"/>\n",
         "</g>\n",
         "<!-- 2 -->\n",
         "<g class=\"node\" id=\"node3\"><title>2</title>\n",
-        "<polygon fill=\"#ffffaa\" points=\"440.396,-84 386.396,-84 386.396,-48 440.396,-48 440.396,-84\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"413.396\" y=\"-62.3\">2</text>\n",
+        "<polygon fill=\"#ffffaa\" points=\"516,-84 462,-84 462,-48 516,-48 516,-84\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"489\" y=\"-62.3\">2</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;2 -->\n",
         "<g class=\"edge\" id=\"edge2\"><title>1-&gt;2</title>\n",
-        "<path d=\"M86.9099,-150.505C92.8863,-151.92 99.3405,-153.225 105.396,-154 200.719,-166.201 229.01,-160.734 320.396,-131 342.539,-123.795 349.163,-123.127 368.396,-110 376.786,-104.273 384.949,-96.8174 391.919,-89.675\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"397.001,-84.3081 394.476,-91.5568 394.595,-86.8495 392.188,-89.3909 392.188,-89.3909 392.188,-89.3909 394.595,-86.8495 389.901,-87.225 397.001,-84.3081 397.001,-84.3081\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-158.8\">!a &amp; b</text>\n",
+        "<path d=\"M144.031,-149.269C150.205,-150.37 156.819,-151.383 163,-152 186.001,-154.297 191.886,-152.778 215,-153 296.033,-153.779 318.806,-155.658 396,-131 418.534,-123.802 424.536,-121.445 444,-108 451.893,-102.548 459.725,-95.6761 466.546,-89.0791\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"471.548,-84.116 468.797,-91.2823 469.063,-86.5811 466.579,-89.0462 466.579,-89.0462 466.579,-89.0462 469.063,-86.5811 464.36,-86.81 471.548,-84.116 471.548,-84.116\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-155.8\">!a &amp; b</text>\n",
         "</g>\n",
         "<!-- 3 -->\n",
         "<g class=\"node\" id=\"node4\"><title>3</title>\n",
-        "<polygon fill=\"#ffffaa\" points=\"211.396,-94 157.396,-94 157.396,-58 211.396,-58 211.396,-94\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"184.396\" y=\"-72.3\">3</text>\n",
+        "<polygon fill=\"#ffffaa\" points=\"269,-94 215,-94 215,-58 269,-58 269,-94\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"242\" y=\"-72.3\">3</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;3 -->\n",
         "<g class=\"edge\" id=\"edge3\"><title>1-&gt;3</title>\n",
-        "<path d=\"M83.2503,-129.536C90.1123,-124.694 97.9646,-119.411 105.396,-115 119.96,-106.355 136.69,-97.8185 150.912,-90.9462\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"157.253,-87.9113 152.299,-93.7747 154.096,-89.4223 150.939,-90.9333 150.939,-90.9333 150.939,-90.9333 154.096,-89.4223 149.579,-88.092 157.253,-87.9113 157.253,-87.9113\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"122.396\" y=\"-118.8\">a &amp; b</text>\n",
+        "<path d=\"M137.532,-131.079C145.273,-125.87 154.441,-119.937 163,-115 177.671,-106.538 194.414,-98.0238 208.618,-91.1196\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"214.948,-88.0665 210.011,-93.9447 211.796,-89.587 208.643,-91.1074 208.643,-91.1074 208.643,-91.1074 211.796,-89.587 207.275,-88.2701 214.948,-88.0665 214.948,-88.0665\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"180\" y=\"-118.8\">a &amp; b</text>\n",
         "</g>\n",
         "<!-- 4 -->\n",
         "<g class=\"node\" id=\"node5\"><title>4</title>\n",
-        "<ellipse cx=\"302.396\" cy=\"-104\" fill=\"#ffffaa\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"302.396\" y=\"-100.3\">1</text>\n",
+        "<ellipse cx=\"369\" cy=\"-104\" fill=\"#ffffaa\" rx=\"27\" ry=\"18\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"369\" y=\"-100.3\">1</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;4 -->\n",
         "<g class=\"edge\" id=\"edge4\"><title>1-&gt;4</title>\n",
-        "<path d=\"M87.4738,-142.898C125.721,-140.694 203.038,-134.451 266.396,-118 270.535,-116.925 274.841,-115.487 278.96,-113.941\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"285.651,-111.282 280.309,-116.794 282.399,-112.575 279.146,-113.867 279.146,-113.867 279.146,-113.867 282.399,-112.575 277.983,-110.94 285.651,-111.282 285.651,-111.282\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"184.396\" y=\"-139.8\">a &amp; !b</text>\n",
+        "<path d=\"M145.11,-141.879C184.28,-138.401 260.441,-130.489 324,-117 328.397,-116.067 332.995,-114.913 337.489,-113.682\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"344.425,-111.703 338.558,-116.653 341.06,-112.663 337.694,-113.623 337.694,-113.623 337.694,-113.623 341.06,-112.663 336.83,-110.594 344.425,-111.703 344.425,-111.703\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"242\" y=\"-137.8\">a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 5 -->\n",
         "<g class=\"node\" id=\"node6\"><title>5</title>\n",
-        "<polygon fill=\"#ffffaa\" points=\"550.396,-40 496.396,-40 496.396,-4 550.396,-4 550.396,-40\" stroke=\"black\"/>\n",
-        "<polygon fill=\"none\" points=\"554.396,-44 492.396,-44 492.396,-3.55271e-15 554.396,-3.55271e-15 554.396,-44\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"523.396\" y=\"-18.3\">4</text>\n",
+        "<polygon fill=\"#ffffaa\" points=\"626,-40 572,-40 572,-4 626,-4 626,-40\" stroke=\"black\"/>\n",
+        "<polygon fill=\"none\" points=\"630,-44 568,-44 568,-3.55271e-15 630,-3.55271e-15 630,-44\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"599\" y=\"-18.3\">4</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;5 -->\n",
         "<g class=\"edge\" id=\"edge5\"><title>2-&gt;5</title>\n",
-        "<path d=\"M440.539,-55.3488C454.074,-49.8349 470.822,-43.0113 485.637,-36.9757\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"492.289,-34.2656 486.995,-39.8239 489.048,-35.5862 485.807,-36.9067 485.807,-36.9067 485.807,-36.9067 489.048,-35.5862 484.618,-33.9895 492.289,-34.2656 492.289,-34.2656\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"466.396\" y=\"-51.8\">{a}</text>\n",
+        "<path d=\"M516.144,-55.3488C529.678,-49.8349 546.427,-43.0113 561.241,-36.9757\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"567.894,-34.2656 562.599,-39.8239 564.652,-35.5862 561.411,-36.9067 561.411,-36.9067 561.411,-36.9067 564.652,-35.5862 560.222,-33.9895 567.894,-34.2656 567.894,-34.2656\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"542\" y=\"-51.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;2</title>\n",
-        "<path d=\"M211.404,-70.9547C217.306,-69.898 223.556,-68.8483 229.396,-68 269.507,-62.1732 279.873,-61.1195 320.396,-62 339.836,-62.4224 361.57,-63.3463 379.03,-64.1999\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"386.233,-64.5597 379.084,-67.3564 382.737,-64.385 379.241,-64.2103 379.241,-64.2103 379.241,-64.2103 382.737,-64.385 379.399,-61.0642 386.233,-64.5597 386.233,-64.5597\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"302.396\" y=\"-65.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge6\"><title>3-&gt;2</title>\n",
+        "<path d=\"M269.038,-71.72C274.939,-70.7884 281.181,-69.833 287,-69 311.393,-65.5082 317.408,-63.5587 342,-62 365.952,-60.4819 372.006,-61.4786 396,-62 415.44,-62.4224 437.174,-63.3463 454.635,-64.1999\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"461.837,-64.5597 454.689,-67.3564 458.341,-64.385 454.846,-64.2103 454.846,-64.2103 454.846,-64.2103 458.341,-64.385 455.003,-61.0642 461.837,-64.5597 461.837,-64.5597\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"369\" y=\"-65.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;4</title>\n",
-        "<path d=\"M211.657,-72.1843C227.874,-70.8265 248.862,-70.9018 266.396,-77 272.543,-79.1381 278.459,-82.823 283.622,-86.7951\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"289.305,-91.5145 281.908,-89.4661 286.613,-89.2786 283.92,-87.0426 283.92,-87.0426 283.92,-87.0426 286.613,-89.2786 285.932,-84.6192 289.305,-91.5145 289.305,-91.5145\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-80.8\">{b}</text>\n",
+        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;4</title>\n",
+        "<path d=\"M269.05,-72.8485C285.188,-71.7406 306.166,-71.8454 324,-77 331.103,-79.0531 338.198,-82.587 344.552,-86.434\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"350.631,-90.3422 343.04,-89.2068 347.687,-88.4496 344.743,-86.557 344.743,-86.557 344.743,-86.557 347.687,-88.4496 346.446,-83.9073 350.631,-90.3422 350.631,-90.3422\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-80.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;5 -->\n",
-        "<g class=\"edge\" id=\"edge6\"><title>3-&gt;5</title>\n",
-        "<path d=\"M211.649,-65.47C217.427,-63.4301 223.564,-61.4721 229.396,-60 319.354,-37.2923 428.464,-27.7027 484.752,-24.03\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"492.008,-23.5705 485.221,-27.1567 488.515,-23.7917 485.022,-24.013 485.022,-24.013 485.022,-24.013 488.515,-23.7917 484.823,-20.8693 492.008,-23.5705 492.008,-23.5705\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"353.396\" y=\"-42.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;5</title>\n",
+        "<path d=\"M269.231,-65.3796C275.01,-63.3453 281.153,-61.4125 287,-60 383.846,-36.6029 501.317,-27.2334 560.32,-23.7959\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"567.564,-23.3867 560.753,-26.9265 564.07,-23.5841 560.575,-23.7816 560.575,-23.7816 560.575,-23.7816 564.07,-23.5841 560.398,-20.6366 567.564,-23.3867 567.564,-23.3867\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"429\" y=\"-40.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;2 -->\n",
         "<g class=\"edge\" id=\"edge10\"><title>4-&gt;2</title>\n",
-        "<path d=\"M319.95,-98.2286C335.72,-92.7311 359.903,-84.3003 379.58,-77.4404\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"386.331,-75.0869 380.758,-80.3657 383.026,-76.2391 379.721,-77.3913 379.721,-77.3913 379.721,-77.3913 383.026,-76.2391 378.684,-74.4168 386.331,-75.0869 386.331,-75.0869\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"353.396\" y=\"-94.8\">{a, b}</text>\n",
+        "<path d=\"M393.595,-96.4015C411.283,-90.7053 435.708,-82.8397 455.282,-76.5362\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"461.985,-74.3778 456.287,-79.522 458.653,-75.4507 455.322,-76.5236 455.322,-76.5236 455.322,-76.5236 458.653,-75.4507 454.356,-73.5253 461.985,-74.3778 461.985,-74.3778\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"429\" y=\"-92.8\">{a, b}</text>\n",
         "</g>\n",
         "<!-- 4&#45;&gt;3 -->\n",
         "<g class=\"edge\" id=\"edge9\"><title>4-&gt;3</title>\n",
-        "<path d=\"M284.335,-102.054C269.627,-100.164 247.903,-96.8631 229.396,-92 225.851,-91.0685 222.189,-89.9687 218.563,-88.7888\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"211.671,-86.4443 219.312,-85.7166 214.984,-87.5715 218.298,-88.6988 218.298,-88.6988 218.298,-88.6988 214.984,-87.5715 217.283,-91.6809 211.671,-86.4443 211.671,-86.4443\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-102.8\">{b}</text>\n",
+        "<path d=\"M342.202,-101.522C326.158,-99.6513 305.191,-96.6048 287,-92 283.447,-91.1006 279.78,-90.0215 276.15,-88.8541\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"269.254,-86.5241 276.894,-85.7807 272.57,-87.6445 275.886,-88.7649 275.886,-88.7649 275.886,-88.7649 272.57,-87.6445 274.878,-91.7492 269.254,-86.5241 269.254,-86.5241\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-101.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 5&#45;&gt;5 -->\n",
         "<g class=\"edge\" id=\"edge11\"><title>5-&gt;5</title>\n",
-        "<path d=\"M513.021,-44.2124C512.172,-53.7952 515.63,-62 523.396,-62 529.098,-62 532.478,-57.5751 533.535,-51.4291\" fill=\"none\" stroke=\"black\"/>\n",
-        "<polygon fill=\"black\" points=\"533.77,-44.2124 536.69,-51.3112 533.656,-47.7105 533.542,-51.2086 533.542,-51.2086 533.542,-51.2086 533.656,-47.7105 530.394,-51.1061 533.77,-44.2124 533.77,-44.2124\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"523.396\" y=\"-65.8\">{a}</text>\n",
+        "<path d=\"M588.626,-44.2124C587.776,-53.7952 591.234,-62 599,-62 604.703,-62 608.083,-57.5751 609.139,-51.4291\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"609.374,-44.2124 612.295,-51.3112 609.26,-47.7105 609.147,-51.2086 609.147,-51.2086 609.147,-51.2086 609.26,-47.7105 605.998,-51.1061 609.374,-44.2124 609.374,-44.2124\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"599\" y=\"-65.8\">{a}</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7f2e884949e8>"
+        "<IPython.core.display.SVG object>"
        ]
       }
      ],
      "prompt_number": 5
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [],
-     "language": "python",
-     "metadata": {},
-     "outputs": []
     }
    ],
    "metadata": {}
   }
  ]
-}
\ No newline at end of file
+}
diff --git a/tests/python/word.ipynb b/tests/python/word.ipynb
index 7e554b7d3..d5e7e61ec 100644
--- a/tests/python/word.ipynb
+++ b/tests/python/word.ipynb
@@ -1,7 +1,23 @@
 {
  "metadata": {
-  "name": "",
-  "signature": "sha256:4fc3934cf5fa0e612923dc4253b5e40115b103a93f588595a6706ec77e7994a9"
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.5.3"
+  },
+  "name": ""
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -31,7 +47,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "aut = spot.translate('G(Fa <-> Xb)'); aut"
+      "aut = spot.translate('G(Fa <-> XXb)'); aut"
      ],
      "language": "python",
      "metadata": {},
@@ -47,99 +63,150 @@
         "<!-- Generated by graphviz version 2.38.0 (20140413.2041)\n",
         " -->\n",
         "<!-- Title: G Pages: 1 -->\n",
-        "<svg width=\"386pt\" height=\"155pt\"\n",
-        " viewBox=\"0.00 0.00 385.50 155.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 151)\">\n",
+        "<svg width=\"465pt\" height=\"215pt\"\n",
+        " viewBox=\"0.00 0.00 464.50 215.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 211)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-151 381.5,-151 381.5,4 -4,4\"/>\n",
+        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-211 460.5,-211 460.5,4 -4,4\"/>\n",
         "<!-- I -->\n",
         "<!-- 0 -->\n",
         "<g id=\"node2\" class=\"node\"><title>0</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-45\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-41.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-55\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-51.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
         "<!-- I&#45;&gt;0 -->\n",
         "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-45C2.79388,-45 17.1543,-45 30.6317,-45\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-45 30.9419,-48.1501 34.4419,-45 30.9419,-45.0001 30.9419,-45.0001 30.9419,-45.0001 34.4419,-45 30.9418,-41.8501 37.9419,-45 37.9419,-45\"/>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-55C2.79388,-55 17.1543,-55 30.6317,-55\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-55 30.9419,-58.1501 34.4419,-55 30.9419,-55.0001 30.9419,-55.0001 30.9419,-55.0001 34.4419,-55 30.9418,-51.8501 37.9419,-55 37.9419,-55\"/>\n",
         "</g>\n",
         "<!-- 1 -->\n",
         "<g id=\"node3\" class=\"node\"><title>1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"139\" cy=\"-96\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"139\" y=\"-92.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"139\" cy=\"-86\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"139\" y=\"-82.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
         "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M71.8566,-54.3542C84.5306,-62.3341 102.896,-73.8976 117.061,-82.816\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"123.238,-86.7051 115.636,-85.641 120.276,-84.8402 117.314,-82.9754 117.314,-82.9754 117.314,-82.9754 120.276,-84.8402 118.992,-80.3097 123.238,-86.7051 123.238,-86.7051\"/>\n",
-        "<text text-anchor=\"start\" x=\"92\" y=\"-76.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M73.003,-61.1246C85.0955,-65.7526 101.855,-72.1668 115.327,-77.3227\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"122.03,-79.8881 114.367,-80.3279 118.761,-78.6371 115.493,-77.386 115.493,-77.386 115.493,-77.386 118.761,-78.6371 116.619,-74.4441 122.03,-79.8881 122.03,-79.8881\"/>\n",
+        "<text text-anchor=\"start\" x=\"94\" y=\"-75.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
         "<!-- 2 -->\n",
         "<g id=\"node4\" class=\"node\"><title>2</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"248\" cy=\"-61\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"248\" y=\"-57.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"139\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"139\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;2 -->\n",
         "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M74.1963,-46.4481C108.109,-49.3039 183.696,-55.6692 222.691,-58.953\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"229.979,-59.5667 222.74,-62.1181 226.492,-59.2729 223.004,-58.9792 223.004,-58.9792 223.004,-58.9792 226.492,-59.2729 223.268,-55.8403 229.979,-59.5667 229.979,-59.5667\"/>\n",
-        "<text text-anchor=\"start\" x=\"135.5\" y=\"-56.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M72.6176,-47.866C84.9439,-42.2355 102.291,-34.3117 116.019,-28.0406\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"122.43,-25.1121 117.372,-30.8858 119.247,-26.5663 116.063,-28.0206 116.063,-28.0206 116.063,-28.0206 119.247,-26.5663 114.754,-25.1554 122.43,-25.1121 122.43,-25.1121\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-41.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
         "</g>\n",
         "<!-- 3 -->\n",
         "<g id=\"node5\" class=\"node\"><title>3</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"357\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"357\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"218\" cy=\"-107\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"218\" y=\"-103.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;3 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M74.3679,-43.4317C125.166,-38.8446 273.551,-25.4452 331.97,-20.17\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"338.957,-19.539 332.268,-23.3059 335.471,-19.8538 331.985,-20.1687 331.985,-20.1687 331.985,-20.1687 335.471,-19.8538 331.702,-17.0314 338.957,-19.539 338.957,-19.539\"/>\n",
-        "<text text-anchor=\"start\" x=\"188\" y=\"-37.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "<!-- 1&#45;&gt;3 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M156.708,-90.5567C167.403,-93.4737 181.445,-97.3031 193.286,-100.533\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"200.325,-102.452 192.743,-103.649 196.948,-101.531 193.571,-100.61 193.571,-100.61 193.571,-100.61 196.948,-101.531 194.4,-97.5713 200.325,-102.452 200.325,-102.452\"/>\n",
+        "<text text-anchor=\"start\" x=\"175\" y=\"-100.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M131.969,-112.664C130.406,-122.625 132.75,-132 139,-132 143.688,-132 146.178,-126.727 146.471,-119.888\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"146.031,-112.664 149.601,-119.46 146.244,-116.158 146.456,-119.651 146.456,-119.651 146.456,-119.651 146.244,-116.158 143.312,-119.842 146.031,-112.664 146.031,-112.664\"/>\n",
-        "<text text-anchor=\"start\" x=\"120.5\" y=\"-135.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "<!-- 4 -->\n",
+        "<g id=\"node6\" class=\"node\"><title>4</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"327\" cy=\"-71\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"327\" y=\"-67.3\" font-family=\"Lato\" font-size=\"14.00\">4</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M157,-98.8379C172.054,-100.594 194.318,-101.307 212,-94 219.178,-91.0336 225.76,-85.8674 231.231,-80.4911\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"236.314,-75.1185 233.791,-82.3685 233.908,-77.6611 231.503,-80.2038 231.503,-80.2038 231.503,-80.2038 233.908,-77.6611 229.215,-78.039 236.314,-75.1185 236.314,-75.1185\"/>\n",
-        "<text text-anchor=\"start\" x=\"176.5\" y=\"-118.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
-        "<text text-anchor=\"start\" x=\"185.5\" y=\"-103.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<!-- 1&#45;&gt;4 -->\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M155.656,-78.8828C167.543,-73.8869 184.441,-67.6441 200,-65 235.174,-59.0223 276.609,-63.083 302.091,-66.8263\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"309.149,-67.9155 301.75,-69.9609 305.69,-67.3817 302.231,-66.8478 302.231,-66.8478 302.231,-66.8478 305.69,-67.3817 302.711,-63.7347 309.149,-67.9155 309.149,-67.9155\"/>\n",
+        "<text text-anchor=\"start\" x=\"212.5\" y=\"-68.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;1 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M229.954,-62.6225C215.066,-64.4327 193.072,-68.0686 175,-75 169.996,-76.9191 164.895,-79.5369 160.19,-82.2732\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"154.066,-86.0235 158.39,-79.6814 157.05,-84.1956 160.035,-82.3677 160.035,-82.3677 160.035,-82.3677 157.05,-84.1956 161.68,-85.054 154.066,-86.0235 154.066,-86.0235\"/>\n",
-        "<text text-anchor=\"start\" x=\"175\" y=\"-78.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "<!-- 5 -->\n",
+        "<g id=\"node7\" class=\"node\"><title>5</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"327\" cy=\"-179\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"327\" y=\"-175.3\" font-family=\"Lato\" font-size=\"14.00\">5</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;2 -->\n",
-        "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M238.767,-76.5414C236.169,-86.9087 239.246,-97 248,-97 254.702,-97 258.077,-91.0847 258.124,-83.6591\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"257.233,-76.5414 261.229,-83.0955 257.668,-80.0143 258.103,-83.4871 258.103,-83.4871 258.103,-83.4871 257.668,-80.0143 254.977,-83.8788 257.233,-76.5414 257.233,-76.5414\"/>\n",
-        "<text text-anchor=\"start\" x=\"231\" y=\"-115.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
-        "<text text-anchor=\"start\" x=\"240\" y=\"-100.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<!-- 1&#45;&gt;5 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;5</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M145.052,-103.353C152.731,-126.145 169.745,-165.231 200,-182 232.013,-199.743 275.986,-193.018 302.622,-186.225\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"309.65,-184.328 303.713,-189.194 306.271,-185.24 302.892,-186.153 302.892,-186.153 302.892,-186.153 306.271,-185.24 302.071,-183.111 309.65,-184.328 309.65,-184.328\"/>\n",
+        "<text text-anchor=\"start\" x=\"212.5\" y=\"-195.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;3 -->\n",
-        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M265.251,-54.4692C283.425,-47.1658 312.983,-35.2873 333.402,-27.0815\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"339.947,-24.4513 334.626,-29.9844 336.699,-25.7565 333.452,-27.0616 333.452,-27.0616 333.452,-27.0616 336.699,-25.7565 332.277,-24.1388 339.947,-24.4513 339.947,-24.4513\"/>\n",
-        "<text text-anchor=\"start\" x=\"284\" y=\"-48.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M151.362,-31.1323C164.441,-46.2502 186.023,-71.1956 200.846,-88.3285\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"205.592,-93.8139 198.63,-90.5811 203.302,-91.167 201.012,-88.5201 201.012,-88.5201 201.012,-88.5201 203.302,-91.167 203.394,-86.4591 205.592,-93.8139 205.592,-93.8139\"/>\n",
+        "<text text-anchor=\"start\" x=\"175\" y=\"-68.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;4 -->\n",
+        "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M156.924,-21.8749C185.025,-28.4443 242.977,-42.5668 291,-58 295.032,-59.2959 299.287,-60.7772 303.387,-62.2649\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"310.075,-64.7429 302.417,-65.2646 306.793,-63.5269 303.511,-62.3108 303.511,-62.3108 303.511,-62.3108 306.793,-63.5269 304.605,-59.3571 310.075,-64.7429 310.075,-64.7429\"/>\n",
+        "<text text-anchor=\"start\" x=\"212.5\" y=\"-44.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
+        "</g>\n",
+        "<!-- 6 -->\n",
+        "<g id=\"node8\" class=\"node\"><title>6</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"436\" cy=\"-22\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"436\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">6</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;6 -->\n",
+        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;6</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M157.136,-18.2323C207.034,-18.9089 352.372,-20.8796 410.528,-21.6682\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"417.817,-21.767 410.775,-24.8217 414.317,-21.7195 410.818,-21.672 410.818,-21.672 410.818,-21.672 414.317,-21.7195 410.861,-18.5223 417.817,-21.767 417.817,-21.767\"/>\n",
+        "<text text-anchor=\"start\" x=\"267\" y=\"-24.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;3 -->\n",
         "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M347.767,-33.5414C345.169,-43.9087 348.246,-54 357,-54 363.702,-54 367.077,-48.0847 367.124,-40.6591\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"366.233,-33.5414 370.229,-40.0955 366.668,-37.0143 367.103,-40.4871 367.103,-40.4871 367.103,-40.4871 366.668,-37.0143 363.977,-40.8788 366.233,-33.5414 366.233,-33.5414\"/>\n",
-        "<text text-anchor=\"start\" x=\"336.5\" y=\"-72.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
-        "<text text-anchor=\"start\" x=\"349\" y=\"-57.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M211.266,-124.037C209.892,-133.858 212.137,-143 218,-143 222.397,-143 224.759,-137.858 225.086,-131.143\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"224.734,-124.037 228.226,-130.873 224.907,-127.533 225.08,-131.029 225.08,-131.029 225.08,-131.029 224.907,-127.533 221.934,-131.185 224.734,-124.037 224.734,-124.037\"/>\n",
+        "<text text-anchor=\"start\" x=\"201\" y=\"-161.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
+        "<text text-anchor=\"start\" x=\"210\" y=\"-146.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "</g>\n",
+        "<!-- 3&#45;&gt;4 -->\n",
+        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M234.442,-114.796C249.614,-121.291 273.039,-128.132 291,-119 301.558,-113.632 309.687,-103.42 315.441,-93.7909\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"318.882,-87.604 318.233,-95.2526 317.181,-90.6629 315.48,-93.7218 315.48,-93.7218 315.48,-93.7218 317.181,-90.6629 312.727,-92.1909 318.882,-87.604 318.882,-87.604\"/>\n",
+        "<text text-anchor=\"start\" x=\"254\" y=\"-126.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "</g>\n",
+        "<!-- 3&#45;&gt;5 -->\n",
+        "<g id=\"edge12\" class=\"edge\"><title>3&#45;&gt;5</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M230.453,-120.313C236.909,-127.314 245.39,-135.722 254,-142 269.46,-153.274 288.841,-163.021 303.599,-169.677\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"310.024,-172.512 302.348,-172.568 306.822,-171.099 303.62,-169.686 303.62,-169.686 303.62,-169.686 306.822,-171.099 304.891,-166.804 310.024,-172.512 310.024,-172.512\"/>\n",
+        "<text text-anchor=\"start\" x=\"254\" y=\"-166.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "</g>\n",
+        "<!-- 4&#45;&gt;3 -->\n",
+        "<g id=\"edge13\" class=\"edge\"><title>4&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M308.918,-72.5299C294.007,-74.2807 271.999,-77.8816 254,-85 248.953,-86.9961 243.833,-89.7328 239.124,-92.5982\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"233.003,-96.5281 237.192,-90.0954 235.949,-94.6371 238.894,-92.7462 238.894,-92.7462 238.894,-92.7462 235.949,-94.6371 240.596,-95.3969 233.003,-96.5281 233.003,-96.5281\"/>\n",
+        "<text text-anchor=\"start\" x=\"255.5\" y=\"-103.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
+        "<text text-anchor=\"start\" x=\"264.5\" y=\"-88.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "</g>\n",
+        "<!-- 4&#45;&gt;4 -->\n",
+        "<g id=\"edge14\" class=\"edge\"><title>4&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M317.767,-86.5414C315.169,-96.9087 318.246,-107 327,-107 333.702,-107 337.077,-101.085 337.124,-93.6591\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"336.233,-86.5414 340.229,-93.0955 336.668,-90.0143 337.103,-93.4871 337.103,-93.4871 337.103,-93.4871 336.668,-90.0143 333.977,-93.8788 336.233,-86.5414 336.233,-86.5414\"/>\n",
+        "<text text-anchor=\"start\" x=\"308.5\" y=\"-110.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "</g>\n",
+        "<!-- 5&#45;&gt;6 -->\n",
+        "<g id=\"edge15\" class=\"edge\"><title>5&#45;&gt;6</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M337.875,-164.511C356.984,-136.471 399.072,-74.7167 421.037,-42.4872\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"425.149,-36.4538 423.81,-44.0122 423.178,-39.3459 421.207,-42.2381 421.207,-42.2381 421.207,-42.2381 423.178,-39.3459 418.604,-40.4641 425.149,-36.4538 425.149,-36.4538\"/>\n",
+        "<text text-anchor=\"start\" x=\"363\" y=\"-126.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "</g>\n",
+        "<!-- 6&#45;&gt;6 -->\n",
+        "<g id=\"edge16\" class=\"edge\"><title>6&#45;&gt;6</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M426.767,-37.5414C424.169,-47.9087 427.246,-58 436,-58 442.702,-58 446.077,-52.0847 446.124,-44.6591\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"445.233,-37.5414 449.229,-44.0955 445.668,-41.0143 446.103,-44.4871 446.103,-44.4871 446.103,-44.4871 445.668,-41.0143 442.977,-44.8788 445.233,-37.5414 445.233,-37.5414\"/>\n",
+        "<text text-anchor=\"start\" x=\"415.5\" y=\"-76.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<text text-anchor=\"start\" x=\"428\" y=\"-61.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb71c0e18a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fdf783f0510> >"
        ]
       }
      ],
@@ -168,12 +235,12 @@
        "text": [
         "Prefix:\n",
         "  0\n",
-        "  |  !a\n",
-        "Cycle:\n",
+        "  |  a\n",
         "  1\n",
-        "  |  a & b\t{0}\n",
-        "  2\n",
-        "  |  !a & b"
+        "  |  a\n",
+        "Cycle:\n",
+        "  3\n",
+        "  |  a & b\t{0}"
        ]
       }
      ],
@@ -200,7 +267,7 @@
        "output_type": "stream",
        "stream": "stdout",
        "text": [
-        "!a\n",
+        "a\n",
         "{0}\n"
        ]
       }
@@ -228,7 +295,7 @@
        "output_type": "pyout",
        "prompt_number": 5,
        "text": [
-        "!a; cycle{a & b; !a & b}"
+        "a; a; cycle{a & b}"
        ]
       }
      ],
@@ -246,8 +313,8 @@
      "collapsed": false,
      "input": [
       "print(spot.bdd_format_formula(aut.get_dict(), word.prefix[0]))\n",
-      "print(spot.bdd_format_formula(aut.get_dict(), word.cycle[0]))\n",
-      "print(spot.bdd_format_formula(aut.get_dict(), word.cycle[1]))"
+      "print(spot.bdd_format_formula(aut.get_dict(), word.prefix[1]))\n",
+      "print(spot.bdd_format_formula(aut.get_dict(), word.cycle[0]))"
      ],
      "language": "python",
      "metadata": {},
@@ -256,9 +323,9 @@
        "output_type": "stream",
        "stream": "stdout",
        "text": [
-        "!a\n",
-        "a & b\n",
-        "!a & b\n"
+        "a\n",
+        "a\n",
+        "a & b\n"
        ]
       }
      ],
@@ -268,7 +335,7 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Calling `simplifify()` will produce a shorter word that is compatible with the original word. For instance in the above word, the initial `!a` is compatible with both `a & b` and `!a & b`.   The word obtained by restricting `!a` to `!a & b` is therefore still accepted, but it allows removing the prefix by rotating the cycle:"
+      "Calling `simplifify()` will produce a shorter word that is compatible with the original word. For instance in the above word, the initial `a` is compatible with both `a & b` and `a & !b`.   The word obtained by restricting `a` to `a & b` is therefore still accepted, allowing us to remove the prefix."
      ]
     },
     {
@@ -286,7 +353,7 @@
        "output_type": "pyout",
        "prompt_number": 7,
        "text": [
-        "cycle{!a & b; a & b}"
+        "cycle{a & b}"
        ]
       }
      ],
@@ -313,7 +380,7 @@
        "output_type": "pyout",
        "prompt_number": 8,
        "text": [
-        "cycle{!a & b; a & b}"
+        "cycle{a & b}"
        ]
       }
      ],
@@ -478,7 +545,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb71c0e1a20> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fdf783f0e40> >"
        ]
       }
      ],
@@ -598,9 +665,10 @@
        "evalue": "a twa_word may not have an empty cycle",
        "output_type": "pyerr",
        "traceback": [
-        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mRuntimeError\u001b[0m                              Traceback (most recent call last)",
+        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+        "\u001b[0;31mRuntimeError\u001b[0m                              Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-18-971829bb8f5f>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0;31m# ... as long as this word is not printed.\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mw\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-        "\u001b[0;32m/home/adl/git/spot/python/spot/impl.py\u001b[0m in \u001b[0;36m__str__\u001b[0;34m(self)\u001b[0m\n\u001b[1;32m   3599\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   3600\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0m__str__\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m->\u001b[0m \u001b[0;34m\"std::string\"\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 3601\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0m_impl\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mtwa_word___str__\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   3602\u001b[0m \u001b[0mtwa_word_swigregister\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0m_impl\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mtwa_word_swigregister\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   3603\u001b[0m \u001b[0mtwa_word_swigregister\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mtwa_word\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/impl.py\u001b[0m in \u001b[0;36m__str__\u001b[0;34m(self)\u001b[0m\n\u001b[1;32m   4160\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   4161\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0m__str__\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m->\u001b[0m \u001b[0;34m\"std::string\"\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 4162\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0m_impl\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mtwa_word___str__\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   4163\u001b[0m \u001b[0mtwa_word_swigregister\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0m_impl\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mtwa_word_swigregister\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   4164\u001b[0m \u001b[0mtwa_word_swigregister\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mtwa_word\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
         "\u001b[0;31mRuntimeError\u001b[0m: a twa_word may not have an empty cycle"
        ]
       }
@@ -611,4 +679,4 @@
    "metadata": {}
   }
  ]
-}
\ No newline at end of file
+}