diff --git a/spot/twaalgos/simulation.cc b/spot/twaalgos/simulation.cc
index e59ed5e4a..2b4e51786 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;
           }
 
@@ -446,10 +456,10 @@ 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());
@@ -472,14 +482,14 @@ 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));
@@ -613,12 +623,12 @@ 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';
@@ -646,9 +656,13 @@ 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 9c5c64dd9..63b9106e7 100755
--- a/tests/core/parseaut.test
+++ b/tests/core/parseaut.test
@@ -1692,7 +1692,7 @@ 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)
@@ -1700,39 +1700,39 @@ 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/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 @@
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         "<text text-anchor=\"start\" x=\"137.75\" y=\"-319.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
         "<!-- I -->\n",
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-        "<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",
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-        "<text text-anchor=\"middle\" x=\"56\" y=\"-195.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
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-        "<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",
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-        "<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",
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+        "</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",
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+        "<text text-anchor=\"start\" x=\"51.5\" y=\"-114.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 1 -->\n",
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+        "<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",
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+        "<text text-anchor=\"start\" x=\"99\" y=\"-107.8\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
         "</g>\n",
         "<!-- 2 -->\n",
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         "</g>\n",
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-        "<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",
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+        "<text text-anchor=\"start\" x=\"92\" y=\"-59.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
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-        "<!-- 0&#45;&gt;0 -->\n",
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-        "<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",
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+        "<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",
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-        "<!-- 2&#45;&gt;2 -->\n",
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-        "<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",
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diff --git a/tests/python/automata.ipynb b/tests/python/automata.ipynb
index dec25e75f..1c8ceacbf 100644
--- a/tests/python/automata.ipynb
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@@ -2735,7 +2734,7 @@
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@@ -2805,7 +2804,7 @@
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        ],
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe334d5cae0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb918234330> >"
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@@ -2877,7 +2876,7 @@
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        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe33408fa58>"
+        "<IPython.core.display.SVG object>"
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@@ -2930,7 +2929,7 @@
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        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3340b0828>"
+        "<IPython.core.display.SVG object>"
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@@ -3042,7 +3041,7 @@
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        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3340cf3c8>"
+        "<IPython.core.display.SVG object>"
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@@ -3154,7 +3153,7 @@
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-        "<IPython.core.display.SVG at 0x7fe3340a9cf8>"
+        "<IPython.core.display.SVG object>"
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@@ -3169,7 +3168,7 @@
     },
     {
      "cell_type": "code",
-     "collapsed": true,
+     "collapsed": false,
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       "display(a)\n",
@@ -3194,35 +3193,35 @@
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@@ -3232,7 +3231,7 @@
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@@ -3315,7 +3314,7 @@
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-        "<IPython.core.display.SVG at 0x7fe33406c7b8>"
+        "<IPython.core.display.SVG object>"
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@@ -3400,7 +3399,7 @@
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+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb9182344b0> >"
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@@ -3410,7 +3409,7 @@
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-      "Adding an automatic proposition to all edges"
+      "Adding an atomic proposition to all edges"
      ]
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@@ -3489,7 +3488,7 @@
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        ],
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe33c747540> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb9182344b0> >"
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@@ -3578,7 +3577,7 @@
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe33c747540> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb9182344b0> >"
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@@ -3588,4 +3587,4 @@
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+}
diff --git a/tests/python/decompose.ipynb b/tests/python/decompose.ipynb
index 68ea84c15..0518248d4 100644
--- a/tests/python/decompose.ipynb
+++ b/tests/python/decompose.ipynb
@@ -80,138 +80,138 @@
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+        "<!-- 4&#45;&gt;1 -->\n",
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+        "<!-- 3&#45;&gt;1 -->\n",
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+        "<!-- 3&#45;&gt;4 -->\n",
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-        "<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",
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        ],
        "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> >"
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@@ -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> >"
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@@ -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> >"
        ]
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       {
@@ -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> >"
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       {
@@ -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> >"
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@@ -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> >"
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@@ -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> >"
        ]
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       {
@@ -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> >"
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       {
@@ -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> >"
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@@ -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> >"
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@@ -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> >"
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@@ -3703,7 +3703,7 @@
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        ],
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-        "<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> >"
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@@ -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> >"
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@@ -4143,7 +4143,7 @@
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        ],
        "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> >"
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@@ -4254,7 +4254,7 @@
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        ],
        "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> >"
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@@ -4346,7 +4346,7 @@
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        ],
        "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> >"
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@@ -4412,7 +4412,7 @@
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        "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> >"
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@@ -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> >"
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@@ -4653,7 +4653,7 @@
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        ],
        "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> >"
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@@ -4782,7 +4782,7 @@
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        ],
        "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> >"
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@@ -4870,7 +4870,7 @@
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        "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> >"
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@@ -4987,7 +4987,7 @@
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        ],
        "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> >"
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diff --git a/tests/python/highlighting.ipynb b/tests/python/highlighting.ipynb
index 04b9c5699..8b7c41e57 100644
--- a/tests/python/highlighting.ipynb
+++ b/tests/python/highlighting.ipynb
@@ -15,7 +15,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.3rc1"
+   "version": "3.5.3"
   },
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@@ -254,7 +254,7 @@
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0b5ab70> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b673b870> >"
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@@ -356,7 +356,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.twa; proxy of <Swig Object of type 'std::shared_ptr< spot::twa > *' at 0x7fd9b0aeb270> >"
+        "<spot.twa; proxy of <Swig Object of type 'std::shared_ptr< spot::twa > *' at 0x7f98b66ad630> >"
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@@ -571,7 +571,7 @@
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        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb390> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad300> >"
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@@ -750,7 +750,7 @@
         "</svg>\n"
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb390> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad300> >"
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@@ -830,7 +830,7 @@
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb660> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad7b0> >"
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@@ -876,7 +876,7 @@
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        ],
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb300> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad570> >"
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@@ -962,7 +962,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb150> >"
+        "<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 0x7fd9b0aeb150> >"
+        "<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 0x7fd9b0aeb660> >"
+        "<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 0x7fd9b0aeb300> >"
+        "<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 0x7fd9b0aeb750> >"
+        "<spot.impl.twa_product; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_product > *' at 0x7f98b66ad510> >"
        ]
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       {
@@ -1471,7 +1471,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb630> >"
+        "<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 0x7fd9b0aeb2d0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad3c0> >"
        ]
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      ],
@@ -1701,7 +1701,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb810> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adcc0> >"
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       }
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@@ -1846,7 +1846,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb810> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adcc0> >"
        ]
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      ],
@@ -1989,7 +1989,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb810> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adcc0> >"
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@@ -2202,51 +2202,51 @@
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         "</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",
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-        "<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",
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         "</g>\n",
-        "<!-- 0 -->\n",
-        "<g class=\"node\" id=\"node3\"><title>0</title>\n",
+        "<!-- 1 -->\n",
+        "<g class=\"node\" id=\"node3\"><title>1</title>\n",
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-        "<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=\"edge3\"><title>1-&gt;0</title>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g class=\"edge\" id=\"edge2\"><title>0-&gt;1</title>\n",
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-        "<!-- 2 -->\n",
-        "<g class=\"node\" id=\"node7\"><title>2</title>\n",
+        "<!-- 3 -->\n",
+        "<g class=\"node\" id=\"node7\"><title>3</title>\n",
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-        "<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=\"edge4\"><title>1-&gt;2</title>\n",
+        "<!-- 0&#45;&gt;3 -->\n",
+        "<g class=\"edge\" id=\"edge4\"><title>0-&gt;3</title>\n",
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         "<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",
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-        "<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=\"edge5\"><title>1-&gt;3</title>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;2</title>\n",
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         "<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",
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@@ -2317,26 +2317,26 @@
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         "<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=\"edge6\"><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",
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         "</g>\n",
-        "<!-- 3&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge9\"><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",
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         "</g>\n",
-        "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge7\"><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",
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         "<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=\"edge8\"><title>3-&gt;3</title>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge6\"><title>2-&gt;2</title>\n",
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         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"132\" y=\"-109.8\">!a &amp; b &amp; !c</text>\n",
@@ -2346,8 +2346,8 @@
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         "</g>\n",
-        "<!-- 3&#45;&gt;5 -->\n",
-        "<g class=\"edge\" id=\"edge10\"><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",
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         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"201\" y=\"-66.8\">!a &amp; b &amp; c</text>\n",
@@ -2358,14 +2358,14 @@
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         "</g>\n",
-        "<!-- 5&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge13\"><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",
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         "<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=\"edge14\"><title>5-&gt;3</title>\n",
+        "<!-- 5&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge13\"><title>5-&gt;2</title>\n",
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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> >"
        ]
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@@ -227,36 +226,36 @@
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         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node2\" class=\"node\"><title>1</title>\n",
+        "<!-- 0 -->\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
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-        "<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",
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-        "<!-- 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",
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-        "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
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+        "<text text-anchor=\"middle\" x=\"135\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
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-        "<!-- 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",
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         "</g>\n",
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-        "<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",
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-        "<!-- 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",
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@@ -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> >"
        ]
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      ],
@@ -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/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 @@
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-  "signature": "sha256:1a85b698ebae51aaba0387d782d1cf5c6cdf54f69dd6b4b9c7189f8676eb4c88"
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
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+    "version": 3
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+   "file_extension": ".py",
+   "mimetype": "text/x-python",
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+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.5.3"
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-        "<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",
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-        "<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",
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-        "<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",
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+        "<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",
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-        "<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",
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-        "<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",
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-        "<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",
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-        "<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",
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-        "<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",
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-        "<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",
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-        "<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",
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-        "<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",
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-        "<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",
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+        "<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",
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-        "<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",
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+        "<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",
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-        "<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",
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        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7f2e80d6fc50>"
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"242\" y=\"-48.8\">a &amp; b</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"379.477\" y=\"-58.8\">0</text>\n",
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+        "<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",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"505.349\" y=\"-121.8\">{a}</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"562.953\" y=\"-108.8\">{a}</text>\n",
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+        "<g class=\"edge\" id=\"edge6\"><title>3-&gt;2</title>\n",
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+        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;4</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"676.349\" y=\"-54.8\">!a &amp; b</text>\n",
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+        "<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",
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+        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;6</title>\n",
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        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7f2e89e119b0>"
+        "<IPython.core.display.SVG object>"
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        "svg": [
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"62.6978\" y=\"-140.3\">init</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"118\" y=\"-140.3\">init</text>\n",
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-        "<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",
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-        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;2</title>\n",
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-        "<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",
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-        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;4</title>\n",
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-        "<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",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-80.8\">{b}</text>\n",
         "</g>\n",
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-        "<g class=\"edge\" id=\"edge6\"><title>3-&gt;5</title>\n",
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-        "<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",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"429\" y=\"-40.8\">{a}</text>\n",
         "</g>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"353.396\" y=\"-94.8\">{a, b}</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"429\" y=\"-92.8\">{a, b}</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-102.8\">{b}</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-101.8\">{b}</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"523.396\" y=\"-65.8\">{a}</text>\n",
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+        "<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": {}
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  ]
-}
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+}
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 @@
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+        "<!-- 5 -->\n",
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+        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;5</title>\n",
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+        "</g>\n",
+        "<!-- 2&#45;&gt;4 -->\n",
+        "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;4</title>\n",
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+        "</g>\n",
+        "<!-- 6 -->\n",
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+        "<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",
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+        "</g>\n",
+        "<!-- 4&#45;&gt;3 -->\n",
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+        "</g>\n",
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+        "<g id=\"edge14\" class=\"edge\"><title>4&#45;&gt;4</title>\n",
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+        "</g>\n",
+        "<!-- 5&#45;&gt;6 -->\n",
+        "<g id=\"edge15\" class=\"edge\"><title>5&#45;&gt;6</title>\n",
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+        "</g>\n",
+        "<!-- 6&#45;&gt;6 -->\n",
+        "<g id=\"edge16\" class=\"edge\"><title>6&#45;&gt;6</title>\n",
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+        "<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
+}