diff --git a/NEWS b/NEWS
index db61afd3b..6a6990aed 100644
--- a/NEWS
+++ b/NEWS
@@ -105,9 +105,11 @@ New in spot 2.7.5.dev (not yet released)
 
   - The LTL simplifier learned the following optional rules:
     F(G(a | Fb)) = FGa | GFb  (if option "favor_event_univ")
-    G(F(a | Gb)) = GFa | FGb   (if option "favor_event_univ")
+    G(F(a | Gb)) = GFa | FGb  (if option "favor_event_univ")
     F(G(a & Fb) = FGa & GFb   (unless option "reduce_size_strictly")
     G(F(a & Gb)) = GFa & FGb  (unless option "reduce_size_strictly")
+    GF(f) = GF(dnf(f))        (unless option "reduce_size_strictly")
+    FG(f) = FG(cnf(f))        (unless option "reduce_size_strictly")
 
   - cleanup_parity() and colorize_parity() were cleaned up a bit,
     resulting in fewer colors used in some cases.  In particular,
diff --git a/doc/tl/tl.tex b/doc/tl/tl.tex
index 38c19da92..936a17ce6 100644
--- a/doc/tl/tl.tex
+++ b/doc/tl/tl.tex
@@ -116,7 +116,7 @@
 \newcommand{\nsereMarked}[1]{\texttt{!+\{}#1\texttt{\}}}
 \newcommand{\seren}[1]{\texttt{\{}#1\texttt{\}!}}
 
-% rewriting rules that enlarge the formula
+% rewriting rules that (may) enlarge the formula
 \newcommand{\equiV}{\stackrel{\star}{\equiv}}
 % rewriting rules that favors event/univ
 \newcommand{\equivEU}{\stackrel{\blacktriangleup}{\equiv}}
@@ -1463,15 +1463,19 @@ instead of $\equiv$, and they can be disabled by setting the
 \label{sec:basic-simp-ltl}
 
 The following are simplification rules for unary operators (applied
-from left to right, as usual):
+from left to right, as usual).  The terms $\mathsf{dnf}(f)$ and
+$\mathsf{cnf}(f)$ denote respectively the disjunctive and conjunctive
+normal forms if $f$, handling non-Boolean sub-formulas as if they were
+atomic propositions.
+
 \begin{align*}
-  \X\F\G f                                                    & \equiv \F\G f & \F(f\U g)        & \equiv \F g             & \G(f \R g)      & \equiv \G g             \\
-  \X\G\F f                                                    & \equiv \G\F f & \F(f\M g)        & \equiv \F (f\AND g)     & \G(f \W g)      & \equiv \G(f\OR g)       \\
-\F\X f                                                        & \equiv \X\F f & \F\G(f\AND \X g) & \equiv \F\G(f\AND g)    & \G\F(f\OR \X g) & \equiv \G\F(f\OR g)     \\
-\G\X f                                                        & \equiv \X\G f & \F\G(f\AND \G g) & \equiv \F\G(f\AND g)    & \G\F(f\OR \F g) & \equiv \G\F(f\OR g)     \\
-                                                              &               & \F\G(f\OR\G g)   & \equiv \F(\G f\OR\G g)  & \G\F(f\AND\F g) & \equiv \G(\F f\AND\F g) \\
-                                                              &               & \F\G(f\AND\F g)  & \equiV \F\G f\AND\G\F g & \G\F(f\AND\G g) & \equiV \G\F f\AND\F\G g \\
-                                                              &               & \F\G(f\OR\F g)  & \equivEU \F\G f\OR\G\F g & \G\F(f\OR\G g) & \equivEU \G\F f\OR\F\G g
+  \X\F\G f & \equiv \F\G f                & \F(f\U g)        & \equiv \F g              & \G(f \R g)      & \equiv \G g             \\
+  \X\G\F f & \equiv \G\F f                & \F(f\M g)        & \equiv \F (f\AND g)      & \G(f \W g)      & \equiv \G(f\OR g)       \\
+\F\X f     & \equiv \X\F f                & \F\G(f\AND \X g) & \equiv \F\G(f\AND g)     & \G\F(f\OR \X g) & \equiv \G\F(f\OR g)     \\
+\G\X f     & \equiv \X\G f                & \F\G(f\AND \G g) & \equiv \F\G(f\AND g)     & \G\F(f\OR \F g) & \equiv \G\F(f\OR g)     \\
+           &                              & \F\G(f\OR\G g)   & \equiv \F(\G f\OR\G g)   & \G\F(f\AND\F g) & \equiv \G(\F f\AND\F g) \\
+\G\F f     & \equiV \G\F(\mathsf{dnf}(f)) & \F\G(f\AND\F g)  & \equiV \F\G f\AND\G\F g  & \G\F(f\AND\G g) & \equiV \G\F f\AND\F\G g \\
+\F\G f     & \equiV \F\G(\mathsf{cnf}(f)) & \F\G(f\OR\F g)   & \equivEU \F\G f\OR\G\F g & \G\F(f\OR\G g)  & \equivEU \G\F f\OR\F\G g
 \end{align*}
 \begin{align*}
   \G(f_1\OR\ldots\OR f_n \OR \G\F(g_1)\OR\ldots\OR \G\F(g_m)) & \equiv \G(f_1\OR\ldots\OR f_n)\OR \G\F(g_1\OR\ldots\OR g_m)
diff --git a/spot/tl/simplify.cc b/spot/tl/simplify.cc
index 82e354796..db8e5cdef 100644
--- a/spot/tl/simplify.cc
+++ b/spot/tl/simplify.cc
@@ -33,6 +33,7 @@
 #include <spot/tl/snf.hh>
 #include <spot/tl/length.hh>
 #include <spot/twa/formula2bdd.hh>
+#include <spot/misc/minato.hh>
 #include <cassert>
 #include <memory>
 
@@ -45,6 +46,7 @@ namespace spot
   {
     typedef std::unordered_map<formula, formula> f2f_map;
     typedef std::unordered_map<formula, bdd> f2b_map;
+    typedef std::map<int, formula> b2f_map;
     typedef std::pair<formula, formula> pairf;
     typedef std::map<pairf, bool> syntimpl_cache_t;
   public:
@@ -78,13 +80,18 @@ namespace spot
          << "syntactic implications: " << syntimpl_.size() << " entries\n"
          << "boolean to bdd:         " << as_bdd_.size() << " entries\n"
          << "star normal form:       " << snf_cache_.size() << " entries\n"
-         << "boolean isop:           " << bool_isop_.size() << " entries\n";
+         << "boolean isop:           " << bool_isop_.size() << " entries\n"
+         << "as dnf:                 " << as_dnf_.size() << " entries\n"
+         << "as cnf:                 " << as_cnf_.size() << " entries\n";
     }
 
     void
     clear_as_bdd_cache()
     {
       as_bdd_.clear();
+      for (auto p: bdd_to_f_)
+        dict->unregister_variable(p.first, this);
+      bdd_to_f_.clear();
     }
 
     // Convert a Boolean formula into a BDD for easier comparison.
@@ -136,7 +143,12 @@ namespace spot
             break;
           }
         default:
-          SPOT_UNIMPLEMENTED();
+          {
+            unsigned var = dict->register_anonymous_variables(1, this);
+            bdd_to_f_[var] = f;
+            result = bdd_ithvar(var);
+            break;
+          }
         }
 
       // Cache the result before returning.
@@ -144,6 +156,83 @@ namespace spot
       return result;
     }
 
+    formula as_xnf(formula f, bool cnf)
+    {
+      bdd in = as_bdd(f);
+      if (cnf)
+        in = !in;
+      minato_isop isop(in);
+      bdd cube;
+      vec clauses;
+      while ((cube = isop.next()) != bddfalse)
+        {
+          vec literals;
+          while (cube != bddtrue)
+            {
+              int var = bdd_var(cube);
+              const bdd_dict::bdd_info& i = dict->bdd_map[var];
+              formula res;
+              if (i.type == bdd_dict::var)
+                {
+                  res = i.f;
+                }
+              else
+                {
+                  res = bdd_to_f_[var];
+                  assert(res);
+                }
+              bdd high = bdd_high(cube);
+              if (high == bddfalse)
+                {
+                  if (!cnf)
+                    res = formula::Not(res);
+                  cube = bdd_low(cube);
+                }
+              else
+                {
+                  if (cnf)
+                    res = formula::Not(res);
+                  // If bdd_low is not false, then cube was not a
+                  // conjunction.
+                  assert(bdd_low(cube) == bddfalse);
+                  cube = high;
+                }
+              assert(cube != bddfalse);
+              literals.emplace_back(res);
+            }
+          if (cnf)
+            clauses.emplace_back(formula::Or(literals));
+          else
+            clauses.emplace_back(formula::And(literals));
+        }
+      if (cnf)
+        return formula::And(clauses);
+      else
+        return formula::Or(clauses);
+    }
+
+    formula as_dnf(formula f)
+    {
+      auto i = as_dnf_.find(f);
+      if (i != as_dnf_.end())
+        return i->second;
+      formula r = as_xnf(f, false);
+      as_dnf_[f] = r;
+      return r;
+    }
+
+    formula as_cnf(formula f)
+    {
+      auto i = as_cnf_.find(f);
+      if (i != as_cnf_.end())
+        return i->second;
+      formula r = as_xnf(f, true);
+      as_cnf_[f] = r;
+      return r;
+    }
+
+
+
     formula
     lookup_nenoform(formula f)
     {
@@ -303,7 +392,10 @@ namespace spot
 
   private:
     f2b_map as_bdd_;
+    b2f_map bdd_to_f_;
     f2f_map simplified_;
+    f2f_map as_dnf_;
+    f2f_map as_cnf_;
     f2f_map nenoform_;
     syntimpl_cache_t syntimpl_;
     snf_cache snf_cache_;
@@ -987,22 +1079,32 @@ namespace spot
                         return recurse(res);
                     }
 
-                  // FG(a & Xb) = FG(a & b)
-                  // FG(a & Gb) = FG(a & b)
-                  if (c.is({op::G, op::And}))
+                  // FG(a) = FG(dnf(a)) if a is not Boolean
+                  // and contains some | above non-Boolean subformulas.
+                  if (c.is(op::G) && !c[0].is_boolean())
                     {
                       formula m = c[0];
-                      if (!m.is_boolean())
-                        {
-                          formula out = m.map([](formula f)
-                                              {
-                                                if (f.is(op::X, op::G))
-                                                  return f[0];
-                                                return f;
-                                              });
-                          if (out != m)
-                            return recurse(unop_unop(op::F, op::G, out));
-                        }
+                      bool want_cnf = m.is(op::And);
+                      if (!want_cnf && m.is(op::Or))
+                        for (auto cc : m)
+                          if (cc.is(op::And))
+                            {
+                              want_cnf = true;
+                              break;
+                            }
+                      if (want_cnf && !opt_.reduce_size_strictly)
+                        m = c_->as_cnf(m);
+                      // FG(a & Xb) = FG(a & b)
+                      // FG(a & Gb) = FG(a & b)
+                      if (m.is(op::And))
+                        m = m.map([](formula f)
+                                  {
+                                    if (f.is(op::X, op::G))
+                                      return f[0];
+                                    return f;
+                                  });
+                      if (c[0] != m)
+                        return recurse(unop_unop(op::F, op::G, m));
                     }
                 }
               // if Fa => a, keep a.
@@ -1248,22 +1350,33 @@ namespace spot
                         return recurse(res);
                     }
 
-                  // GF(a | Xb) = GF(a | b)
-                  // GF(a | Fb) = GF(a | b)
-                  if (c.is({op::F, op::Or}))
+
+                  // GF(a) = GF(dnf(a)) if a is not Boolean
+                  // and contains some | above non-Boolean subformulas.
+                  if (c.is(op::F) && !c[0].is_boolean())
                     {
                       formula m = c[0];
-                      if (!m.is_boolean())
-                        {
-                          formula out = m.map([](formula f)
-                                              {
-                                                if (f.is(op::X, op::F))
-                                                  return f[0];
-                                                return f;
-                                              });
-                          if (out != m)
-                            return recurse(unop_unop(op::G, op::F, out));
-                        }
+                      bool want_dnf = m.is(op::Or);
+                      if (!want_dnf && m.is(op::And))
+                        for (auto cc : m)
+                          if (cc.is(op::Or))
+                            {
+                              want_dnf = true;
+                              break;
+                            }
+                      if (want_dnf && !opt_.reduce_size_strictly)
+                        m = c_->as_dnf(m);
+                      // GF(a | Xb) = GF(a | b)
+                      // GF(a | Fb) = GF(a | b)
+                      if (m.is(op::Or))
+                        m = m.map([](formula f)
+                                  {
+                                    if (f.is(op::X, op::F))
+                                      return f[0];
+                                    return f;
+                                  });
+                      if (c[0] != m)
+                        return recurse(unop_unop(op::G, op::F, m));
                     }
                   // GF(f1 & f2 & eu1 & eu2) = G(F(f1 & f2) & eu1 & eu2
                   if (opt_.event_univ && c.is({op::F, op::And}))
diff --git a/tests/Makefile.am b/tests/Makefile.am
index ef2430ae4..253b82dc3 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -208,6 +208,7 @@ TESTS_misc = \
   core/trival.test
 
 TESTS_twa = \
+  core/385.test \
   core/acc.test \
   core/acc2.test \
   core/bdddict.test \
diff --git a/tests/core/385.test b/tests/core/385.test
new file mode 100755
index 000000000..a3ae9cecb
--- /dev/null
+++ b/tests/core/385.test
@@ -0,0 +1,45 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2019 Laboratoire de Recherche et Développement de
+# l'Epita (LRDE).
+#
+# This file is part of Spot, a model checking library.
+#
+# Spot is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# Spot is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. ./defs
+
+set -e
+
+# Formulas from issue #385.
+
+ltl2tgba -G --stats=%s,%f> out <<EOF
+GFX((e & XXXa) -> (e & X!d))
+G(Gc | Fa | F!G(c | Ge))
+Ge | XGF(Ge & X(c & Fd))
+G!GXXe -> GF(b & c & Gc)
+G!(Gd & (c | Fb))
+XF(F(Gc & Xb) -> a)
+EOF
+
+# Some of the following are still not optimal.
+cat >expected <<EOF
+1,GF(!a | !d | !e)
+6,G(Gc | F(a | (!c & F!e)))
+2,Ge | G(Fd & FGe & Fc)
+1,F(G(Fb & FGc) | Ge)
+4,G(F!d | (!c & G!b))
+3,F(GF!c | G!b) | XFa
+EOF
+diff out expected
diff --git a/tests/core/ltl2tgba2.test b/tests/core/ltl2tgba2.test
index 650399bd0..3c52536da 100755
--- a/tests/core/ltl2tgba2.test
+++ b/tests/core/ltl2tgba2.test
@@ -369,7 +369,7 @@ diff output expected
 cat >formulas <<EOF
 GF((a & XXa) | (!a & XX!a)), 4,8, 4,8, 6,14, 7,14, 4,8
 GF((a & XXXa) | (!a & XXX!a)), 7,14, 8,16, 8,18, 15,30, 8,16
-GF(((a & Xb) | XXc) & Xd), 4,64, 4,64, 5,80, 5,80, 4,64
+GF(((a & Xb) | XXc) & Xd), 3,58, 4,64, 3,58, 5,80, 4,64
 GF((b | Fa) & (b R Xb)), 2,4, 2,4, 3,6, 3,12, 2,4
 G(F(a & Xa) & F(a & X!a)), 2,4, 2,4, 4,8, 4,8, 3,6
 G(!p0 & F(p1 & XG!p1)), 1,0, 1,0, 1,0, 1,0, 1,0
diff --git a/tests/core/reduccmp.test b/tests/core/reduccmp.test
index 9db10e04b..bad739155 100755
--- a/tests/core/reduccmp.test
+++ b/tests/core/reduccmp.test
@@ -346,6 +346,8 @@ F(G(a & Fb)), G(Fb & FGa)
 G(F(a & Gb)), G(Fa & FGb)
 Ge | XGF(Ge & X(c & Fd)), Ge | G(Fd & FGe & Fc)
 G!GXXe -> GF(b & c & Gc), F(G(Fb & FGc) | Ge)
+GFX((e & XXXa) -> (e & X!d)), GF(!a | !d | !e)
+!GFX((e & XXXa) -> (e & X!d)), FG(a & d & e)
 
 # Because reduccmp will translate the formula,
 # this also check for an old bug in ltl2tgba_fm.
diff --git a/tests/python/automata.ipynb b/tests/python/automata.ipynb
index 9209b6991..ac2718107 100644
--- a/tests/python/automata.ipynb
+++ b/tests/python/automata.ipynb
@@ -178,7 +178,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c0b2de0> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6034a960> >"
       ]
      },
      "execution_count": 2,
@@ -643,7 +643,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c02c930> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a60301210> >"
       ]
      },
      "execution_count": 6,
@@ -719,7 +719,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c02c960> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a60301bd0> >"
       ]
      },
      "execution_count": 7,
@@ -802,7 +802,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c02ca80> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a60301690> >"
       ]
      },
      "execution_count": 8,
@@ -1321,7 +1321,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c03ec90> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a603010c0> >"
       ]
      },
      "execution_count": 12,
@@ -1435,7 +1435,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c03edb0> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a60301090> >"
       ]
      },
      "execution_count": 13,
@@ -1566,7 +1566,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c03ecf0> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a60301c90> >"
       ]
      },
      "execution_count": 14,
@@ -1785,7 +1785,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d077c1540> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6030f4b0> >"
       ]
      },
      "metadata": {},
@@ -1935,7 +1935,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c02c630> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a60392630> >"
       ]
      },
      "metadata": {},
@@ -2107,7 +2107,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d077c1780> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6030f930> >"
       ]
      },
      "metadata": {},
@@ -2282,7 +2282,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d077c1660> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6030f870> >"
       ]
      },
      "metadata": {},
@@ -2468,7 +2468,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d077c1810> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6030fbd0> >"
       ]
      },
      "execution_count": 19,
@@ -2544,7 +2544,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d077c1930> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6030f150> >"
       ]
      },
      "execution_count": 20,
@@ -2616,7 +2616,7 @@
        "<title>0-&gt;0</title>\n",
        "<path d=\"M49.6208,-37.4339C48.3189,-47.2545 50.4453,-56.3966 56,-56.3966 60.166,-56.3966 62.4036,-51.2542 62.7128,-44.5399\" fill=\"none\" stroke=\"#000000\"/>\n",
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+       "<title>1-&gt;3</title>\n",
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-       "<!-- 2&#45;&gt;1 -->\n",
+       "<!-- 2&#45;&gt;2 -->\n",
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+       "<title>2-&gt;2</title>\n",
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-       "<!-- 2&#45;&gt;2 -->\n",
+       "<!-- 2&#45;&gt;3 -->\n",
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-       "<title>2-&gt;2</title>\n",
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+       "<title>2-&gt;3</title>\n",
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-       "<!-- 2&#45;&gt;2 -->\n",
+       "<!-- 3&#45;&gt;1 -->\n",
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-       "<title>2-&gt;2</title>\n",
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-       "<text fill=\"#ff4da0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"319\" y=\"-157.8\">❶</text>\n",
+       "<title>3-&gt;1</title>\n",
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+       "<!-- 3&#45;&gt;1 -->\n",
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+       "<title>3-&gt;1</title>\n",
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+       "<text fill=\"#ff4da0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"376\" y=\"-69.8638\">❶</text>\n",
+       "</g>\n",
+       "<!-- 3&#45;&gt;3 -->\n",
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+       "<title>3-&gt;3</title>\n",
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+       "<text fill=\"#1f78b4\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"441\" y=\"-127.8638\">⓿</text>\n",
+       "</g>\n",
+       "<!-- 3&#45;&gt;3 -->\n",
+       "<g class=\"edge\" id=\"edge15\">\n",
+       "<title>3-&gt;3</title>\n",
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+       "<text fill=\"#000000\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"245.5\" y=\"-256.2783\">)</text>\n",
+       "<text fill=\"#000000\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"158.5\" y=\"-242.2783\">[gen. Büchi 2]</text>\n",
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        "<title>I-&gt;0</title>\n",
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-       "<text fill=\"#1f78b4\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"48\" y=\"-57.8\">⓿</text>\n",
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        "<!-- 0&#45;&gt;1 -->\n",
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+       "</a>\n",
+       "</g>\n",
+       "</g>\n",
+       "<!-- 0&#45;&gt;3 -->\n",
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+       "<title>0-&gt;3</title>\n",
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+       "<text fill=\"#1f78b4\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"259\" y=\"-192.2783\">⓿</text>\n",
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-       "<!-- 1&#45;&gt;2 -->\n",
+       "<!-- 1&#45;&gt;3 -->\n",
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-       "<title>1-&gt;2</title>\n",
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-       "<text fill=\"#000000\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"199\" y=\"-166.8\">!a &amp; !c</text>\n",
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-       "<!-- 1&#45;&gt;2 -->\n",
+       "<!-- 1&#45;&gt;3 -->\n",
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-       "<title>1-&gt;2</title>\n",
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-       "<text fill=\"#ff4da0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"211\" y=\"-109.8\">❶</text>\n",
+       "<title>1-&gt;3</title>\n",
+       "<path d=\"M291.8393,-129.0964C307.8181,-134.2861 332.1267,-139.2918 351,-130.4783 360.4199,-126.0794 368.2449,-117.8688 374.1666,-109.7918\" fill=\"none\" stroke=\"#000000\"/>\n",
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+       "<text fill=\"#000000\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"315\" y=\"-153.2783\">a &amp; c</text>\n",
+       "<text fill=\"#ff4da0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"323\" y=\"-138.2783\">❶</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"201\" y=\"-88.8\">a &amp; !c</text>\n",
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+       "<text fill=\"#000000\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"202\" y=\"-92.2783\">!a &amp; b</text>\n",
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-       "<!-- 2&#45;&gt;1 -->\n",
+       "<!-- 2&#45;&gt;2 -->\n",
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-       "<text fill=\"#ff4da0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"211\" y=\"-53.8\">❶</text>\n",
+       "<title>2-&gt;2</title>\n",
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+       "<text fill=\"#1f78b4\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"157.5\" y=\"-68.2783\">⓿</text>\n",
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-       "<!-- 2&#45;&gt;2 -->\n",
+       "<!-- 2&#45;&gt;3 -->\n",
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+       "<title>2-&gt;3</title>\n",
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+       "<text fill=\"#1f78b4\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"267\" y=\"-41.2783\">⓿</text>\n",
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-       "<!-- 2&#45;&gt;2 -->\n",
+       "<!-- 3&#45;&gt;1 -->\n",
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-       "<title>2-&gt;2</title>\n",
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-       "<text fill=\"#ff4da0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"275\" y=\"-157.8\">❶</text>\n",
+       "<title>3-&gt;1</title>\n",
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+       "<!-- 3&#45;&gt;1 -->\n",
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+       "<title>3-&gt;1</title>\n",
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+       "<text fill=\"#ff4da0\" font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"323\" y=\"-68.2783\">❶</text>\n",
+       "</g>\n",
+       "<!-- 3&#45;&gt;3 -->\n",
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+       "<title>3-&gt;3</title>\n",
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+       "<!-- 3&#45;&gt;3 -->\n",
+       "<g class=\"edge\" id=\"edge15\">\n",
+       "<title>3-&gt;3</title>\n",
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@@ -3062,7 +3121,7 @@
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       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d077c1e40> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6034ad20> >"
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@@ -3162,7 +3221,7 @@
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       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c02c750> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a60301ba0> >"
       ]
      },
      "execution_count": 24,
@@ -3235,7 +3294,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c02c780> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6030f9c0> >"
       ]
      },
      "execution_count": 25,
@@ -3399,7 +3458,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d1c03ed80> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6030f750> >"
       ]
      },
      "execution_count": 27,
@@ -3482,7 +3541,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d077c1e40> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6034ad20> >"
       ]
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@@ -3547,7 +3606,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d077c1e40> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6034ad20> >"
       ]
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@@ -3634,7 +3693,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0d077c1e40> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5a6034ad20> >"
       ]
      },
      "execution_count": 29,
@@ -3667,7 +3726,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.7"
+   "version": "3.7.3"
   }
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diff --git a/tests/python/twagraph-internals.ipynb b/tests/python/twagraph-internals.ipynb
index 594e5c3eb..dbd366d7c 100644
--- a/tests/python/twagraph-internals.ipynb
+++ b/tests/python/twagraph-internals.ipynb
@@ -56,16 +56,16 @@
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        "<!-- Pages: 1 -->\n",
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-       " viewBox=\"0.00 0.00 197.50 221.60\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+       "<svg width=\"196pt\" height=\"222pt\"\n",
+       " viewBox=\"0.00 0.00 195.50 221.60\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
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+       "<text text-anchor=\"start\" x=\"66.75\" y=\"-199.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
+       "<text text-anchor=\"start\" x=\"82.75\" y=\"-199.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">) &amp; Inf(</text>\n",
+       "<text text-anchor=\"start\" x=\"125.75\" y=\"-199.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff4da0\">❶</text>\n",
+       "<text text-anchor=\"start\" x=\"141.75\" y=\"-199.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">)</text>\n",
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-       "<text text-anchor=\"start\" x=\"37.5\" y=\"-118.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">a &amp; !b</text>\n",
+       "<text text-anchor=\"start\" x=\"35.5\" y=\"-118.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">!a &amp; !b</text>\n",
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@@ -92,7 +92,7 @@
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-       "<text text-anchor=\"start\" x=\"39\" y=\"-148.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">a &amp; b</text>\n",
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@@ -106,14 +106,14 @@
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-       "<text text-anchor=\"start\" x=\"94\" y=\"-25.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">a &amp; !b</text>\n",
+       "<text text-anchor=\"start\" x=\"92\" y=\"-25.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">!a &amp; !b</text>\n",
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@@ -136,7 +136,7 @@
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-       "<text text-anchor=\"start\" x=\"148.5\" y=\"-118.397\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">!a &amp; !b</text>\n",
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@@ -144,14 +144,14 @@
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        "</svg>\n"
       ],
       "text/plain": [
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+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7e3c439b10> >"
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@@ -2813,10 +2813,10 @@
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"461.5\" y=\"-307.8\">{0,1}</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"521.5\" y=\"-286.8\">~0</text>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"542.5,-280 542.5,-301 569.5,-301 569.5,-280 542.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"542.5,-280 542.5,-301 569.5,-301 569.5,-280 542.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"548.5\" y=\"-286.8\">~3</text>\n",
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+       "<polygon fill=\"none\" points=\"510.5,-259 510.5,-280 537.5,-280 537.5,-259 510.5,-259\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"520.5\" y=\"-265.8\">0</text>\n",
+       "<polygon fill=\"none\" points=\"537.5,-259 537.5,-280 564.5,-280 564.5,-259 537.5,-259\" stroke=\"#000000\"/>\n",
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-       "<polygon fill=\"#ffff00\" points=\"235.5,-238 235.5,-259 278.5,-259 278.5,-238 235.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"235.5,-238 235.5,-259 278.5,-259 278.5,-238 235.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"253.5\" y=\"-244.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"278.5,-238 278.5,-259 325.5,-259 325.5,-238 278.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"278.5,-238 278.5,-259 325.5,-259 325.5,-238 278.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"298.5\" y=\"-244.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"325.5,-238 325.5,-259 368.5,-259 368.5,-238 325.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"325.5,-238 325.5,-259 368.5,-259 368.5,-238 325.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"343.5\" y=\"-244.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"368.5,-238 368.5,-259 415.5,-259 415.5,-238 368.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"368.5,-238 368.5,-259 415.5,-259 415.5,-238 368.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"388.5\" y=\"-244.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"415.5,-238 415.5,-259 458.5,-259 458.5,-238 415.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"415.5,-238 415.5,-259 458.5,-259 458.5,-238 415.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"433.5\" y=\"-244.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"458.5,-238 458.5,-259 495.5,-259 495.5,-238 458.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"458.5,-238 458.5,-259 495.5,-259 495.5,-238 458.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"473.5\" y=\"-244.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"495.5,-238 495.5,-259 515.5,-259 515.5,-238 495.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"495.5,-238 495.5,-259 515.5,-259 515.5,-238 495.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"502\" y=\"-244.8\">2</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"515.5,-238 515.5,-259 542.5,-259 542.5,-238 515.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"515.5,-238 515.5,-259 542.5,-259 542.5,-238 515.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"525.5\" y=\"-244.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"542.5,-238 542.5,-259 569.5,-259 569.5,-238 542.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"542.5,-238 542.5,-259 569.5,-259 569.5,-238 542.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"552.5\" y=\"-244.8\">3</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"235.5,-238 235.5,-259 282.5,-259 282.5,-238 235.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"235.5,-238 235.5,-259 282.5,-259 282.5,-238 235.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"255.5\" y=\"-244.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"282.5,-238 282.5,-259 325.5,-259 325.5,-238 282.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"282.5,-238 282.5,-259 325.5,-259 325.5,-238 282.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"300.5\" y=\"-244.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"325.5,-238 325.5,-259 372.5,-259 372.5,-238 325.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"325.5,-238 325.5,-259 372.5,-259 372.5,-238 325.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"345.5\" y=\"-244.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"372.5,-238 372.5,-259 415.5,-259 415.5,-238 372.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"372.5,-238 372.5,-259 415.5,-259 415.5,-238 372.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"390.5\" y=\"-244.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"415.5,-238 415.5,-259 453.5,-259 453.5,-238 415.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"415.5,-238 415.5,-259 453.5,-259 453.5,-238 415.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"431\" y=\"-244.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"453.5,-238 453.5,-259 490.5,-259 490.5,-238 453.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"453.5,-238 453.5,-259 490.5,-259 490.5,-238 453.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"468.5\" y=\"-244.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"490.5,-238 490.5,-259 510.5,-259 510.5,-238 490.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"490.5,-238 490.5,-259 510.5,-259 510.5,-238 490.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"497\" y=\"-244.8\">2</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"510.5,-238 510.5,-259 537.5,-259 537.5,-238 510.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"510.5,-238 510.5,-259 537.5,-259 537.5,-238 510.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"520.5\" y=\"-244.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"537.5,-238 537.5,-259 564.5,-259 564.5,-238 537.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"537.5,-238 537.5,-259 564.5,-259 564.5,-238 537.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"547.5\" y=\"-244.8\">3</text>\n",
        "</g>\n",
        "<!-- dests -->\n",
        "<g class=\"node\" id=\"node3\">\n",
        "<title>dests</title>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"603.5,-301 603.5,-322 652.5,-322 652.5,-301 603.5,-301\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"603.5,-301 652.5,-301 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"614\" y=\"-307.8\">dests</text>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"652.5,-301 652.5,-322 673.5,-322 673.5,-301 652.5,-301\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"652.5,-301 673.5,-301 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"655.5\" y=\"-307.8\">~0</text>\n",
-       "<polyline fill=\"none\" points=\"673.5,-301 686.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"686.5,-301 699.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"699.5,-301 699.5,-322 720.5,-322 720.5,-301 699.5,-301\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"699.5,-301 720.5,-301 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"702.5\" y=\"-307.8\">~3</text>\n",
-       "<polyline fill=\"none\" points=\"720.5,-301 733.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"733.5,-301 746.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polygon fill=\"none\" points=\"603.5,-280 603.5,-301 652.5,-301 652.5,-280 603.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"606.5\" y=\"-286.8\">#cnt/dst</text>\n",
-       "<polygon fill=\"none\" points=\"652.5,-280 652.5,-301 673.5,-301 673.5,-280 652.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"656\" y=\"-286.8\">#2</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"673.5,-280 673.5,-301 686.5,-301 686.5,-280 673.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"673.5,-280 673.5,-301 686.5,-301 686.5,-280 673.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"676.5\" y=\"-286.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"686.5,-280 686.5,-301 699.5,-301 699.5,-280 686.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"686.5,-280 686.5,-301 699.5,-301 699.5,-280 686.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"689.5\" y=\"-286.8\">3</text>\n",
-       "<polygon fill=\"none\" points=\"699.5,-280 699.5,-301 720.5,-301 720.5,-280 699.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"703\" y=\"-286.8\">#2</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"720.5,-280 720.5,-301 733.5,-301 733.5,-280 720.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"720.5,-280 720.5,-301 733.5,-301 733.5,-280 720.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"723.5\" y=\"-286.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"733.5,-280 733.5,-301 746.5,-301 746.5,-280 733.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"733.5,-280 733.5,-301 746.5,-301 746.5,-280 733.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"736.5\" y=\"-286.8\">1</text>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"598.5,-301 598.5,-322 647.5,-322 647.5,-301 598.5,-301\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"598.5,-301 647.5,-301 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"609\" y=\"-307.8\">dests</text>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"647.5,-301 647.5,-322 668.5,-322 668.5,-301 647.5,-301\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"647.5,-301 668.5,-301 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"650.5\" y=\"-307.8\">~0</text>\n",
+       "<polyline fill=\"none\" points=\"668.5,-301 681.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"681.5,-301 694.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"694.5,-301 694.5,-322 715.5,-322 715.5,-301 694.5,-301\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"694.5,-301 715.5,-301 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"697.5\" y=\"-307.8\">~3</text>\n",
+       "<polyline fill=\"none\" points=\"715.5,-301 728.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"728.5,-301 741.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polygon fill=\"none\" points=\"598.5,-280 598.5,-301 647.5,-301 647.5,-280 598.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"601.5\" y=\"-286.8\">#cnt/dst</text>\n",
+       "<polygon fill=\"none\" points=\"647.5,-280 647.5,-301 668.5,-301 668.5,-280 647.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"651\" y=\"-286.8\">#2</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"668.5,-280 668.5,-301 681.5,-301 681.5,-280 668.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"668.5,-280 668.5,-301 681.5,-301 681.5,-280 668.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"671.5\" y=\"-286.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"681.5,-280 681.5,-301 694.5,-301 694.5,-280 681.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"681.5,-280 681.5,-301 694.5,-301 694.5,-280 681.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"684.5\" y=\"-286.8\">3</text>\n",
+       "<polygon fill=\"none\" points=\"694.5,-280 694.5,-301 715.5,-301 715.5,-280 694.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"698\" y=\"-286.8\">#2</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"715.5,-280 715.5,-301 728.5,-301 728.5,-280 715.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"715.5,-280 715.5,-301 728.5,-301 728.5,-280 715.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"718.5\" y=\"-286.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"728.5,-280 728.5,-301 741.5,-301 741.5,-280 728.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"728.5,-280 728.5,-301 741.5,-301 741.5,-280 728.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"731.5\" y=\"-286.8\">1</text>\n",
        "</g>\n",
        "<!-- meta -->\n",
        "<g class=\"node\" id=\"node4\">\n",
@@ -3458,26 +3458,26 @@
        "<!-- props -->\n",
        "<g class=\"node\" id=\"node5\">\n",
        "<title>props</title>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-180.8\">prop_state_acc:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-180.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-161.8\">prop_inherently_weak:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-161.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-142.8\">prop_terminal:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-142.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-123.8\">prop_weak:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-123.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-104.8\">prop_very_weak:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-104.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-85.8\">prop_complete:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-85.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-66.8\">prop_universal:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-66.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-47.8\">prop_unambiguous:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-47.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-28.8\">prop_semi_deterministic:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-28.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-9.8\">prop_stutter_invariant:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-9.8\">maybe</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"279.5\" y=\"-180.8\">prop_state_acc:</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"423.5\" y=\"-180.8\">maybe</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"279.5\" y=\"-161.8\">prop_inherently_weak:</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"423.5\" y=\"-161.8\">maybe</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"279.5\" y=\"-142.8\">prop_terminal:</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"423.5\" y=\"-142.8\">maybe</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"279.5\" y=\"-123.8\">prop_weak:</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"423.5\" y=\"-123.8\">maybe</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"279.5\" y=\"-104.8\">prop_very_weak:</text>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"423.5\" y=\"-104.8\">maybe</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"461.5\" y=\"-307.8\">{0,1}</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"545.5\" y=\"-307.8\">{0}</text>\n",
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+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"456.5\" y=\"-307.8\">{0,1}</text>\n",
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-       "<polygon fill=\"#ffc0cb\" points=\"515.5,-280 515.5,-301 542.5,-301 542.5,-280 515.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"515.5,-280 515.5,-301 542.5,-301 542.5,-280 515.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"521.5\" y=\"-286.8\">~0</text>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"542.5,-280 542.5,-301 569.5,-301 569.5,-280 542.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"542.5,-280 542.5,-301 569.5,-301 569.5,-280 542.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"548.5\" y=\"-286.8\">~3</text>\n",
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+       "<polygon fill=\"none\" points=\"235.5,-280 235.5,-301 282.5,-301 282.5,-280 235.5,-280\" stroke=\"#000000\"/>\n",
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-       "<polygon fill=\"#ffff00\" points=\"235.5,-238 235.5,-259 278.5,-259 278.5,-238 235.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"235.5,-238 235.5,-259 278.5,-259 278.5,-238 235.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"253.5\" y=\"-244.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"278.5,-238 278.5,-259 325.5,-259 325.5,-238 278.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"278.5,-238 278.5,-259 325.5,-259 325.5,-238 278.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"298.5\" y=\"-244.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"325.5,-238 325.5,-259 368.5,-259 368.5,-238 325.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"325.5,-238 325.5,-259 368.5,-259 368.5,-238 325.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"343.5\" y=\"-244.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"368.5,-238 368.5,-259 415.5,-259 415.5,-238 368.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"368.5,-238 368.5,-259 415.5,-259 415.5,-238 368.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"388.5\" y=\"-244.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"415.5,-238 415.5,-259 458.5,-259 458.5,-238 415.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"415.5,-238 415.5,-259 458.5,-259 458.5,-238 415.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"433.5\" y=\"-244.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"458.5,-238 458.5,-259 495.5,-259 495.5,-238 458.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"458.5,-238 458.5,-259 495.5,-259 495.5,-238 458.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"473.5\" y=\"-244.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"495.5,-238 495.5,-259 515.5,-259 515.5,-238 495.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"495.5,-238 495.5,-259 515.5,-259 515.5,-238 495.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"502\" y=\"-244.8\">2</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"515.5,-238 515.5,-259 542.5,-259 542.5,-238 515.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"515.5,-238 515.5,-259 542.5,-259 542.5,-238 515.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"525.5\" y=\"-244.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"542.5,-238 542.5,-259 569.5,-259 569.5,-238 542.5,-238\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"542.5,-238 542.5,-259 569.5,-259 569.5,-238 542.5,-238\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"552.5\" y=\"-244.8\">3</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"235.5,-238 235.5,-259 282.5,-259 282.5,-238 235.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"235.5,-238 235.5,-259 282.5,-259 282.5,-238 235.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"255.5\" y=\"-244.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"282.5,-238 282.5,-259 325.5,-259 325.5,-238 282.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"282.5,-238 282.5,-259 325.5,-259 325.5,-238 282.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"300.5\" y=\"-244.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"325.5,-238 325.5,-259 372.5,-259 372.5,-238 325.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"325.5,-238 325.5,-259 372.5,-259 372.5,-238 325.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"345.5\" y=\"-244.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"372.5,-238 372.5,-259 415.5,-259 415.5,-238 372.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"372.5,-238 372.5,-259 415.5,-259 415.5,-238 372.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"390.5\" y=\"-244.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"415.5,-238 415.5,-259 453.5,-259 453.5,-238 415.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"415.5,-238 415.5,-259 453.5,-259 453.5,-238 415.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"431\" y=\"-244.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"453.5,-238 453.5,-259 490.5,-259 490.5,-238 453.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"453.5,-238 453.5,-259 490.5,-259 490.5,-238 453.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"468.5\" y=\"-244.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"490.5,-238 490.5,-259 510.5,-259 510.5,-238 490.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"490.5,-238 490.5,-259 510.5,-259 510.5,-238 490.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"497\" y=\"-244.8\">2</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"510.5,-238 510.5,-259 537.5,-259 537.5,-238 510.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"510.5,-238 510.5,-259 537.5,-259 537.5,-238 510.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"520.5\" y=\"-244.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"537.5,-238 537.5,-259 564.5,-259 564.5,-238 537.5,-238\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"537.5,-238 537.5,-259 564.5,-259 564.5,-238 537.5,-238\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"547.5\" y=\"-244.8\">3</text>\n",
        "</g>\n",
        "<!-- dests -->\n",
        "<g class=\"node\" id=\"node3\">\n",
        "<title>dests</title>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"603.5,-301 603.5,-322 652.5,-322 652.5,-301 603.5,-301\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"603.5,-301 652.5,-301 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"614\" y=\"-307.8\">dests</text>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"652.5,-301 652.5,-322 673.5,-322 673.5,-301 652.5,-301\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"652.5,-301 673.5,-301 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"655.5\" y=\"-307.8\">~0</text>\n",
-       "<polyline fill=\"none\" points=\"673.5,-301 686.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"686.5,-301 699.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"699.5,-301 699.5,-322 720.5,-322 720.5,-301 699.5,-301\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"699.5,-301 720.5,-301 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"702.5\" y=\"-307.8\">~3</text>\n",
-       "<polyline fill=\"none\" points=\"720.5,-301 733.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"733.5,-301 746.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"746.5,-301 746.5,-322 767.5,-322 767.5,-301 746.5,-301\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"746.5,-301 767.5,-301 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"749.5\" y=\"-307.8\">~6</text>\n",
-       "<polyline fill=\"none\" points=\"767.5,-301 780.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"780.5,-301 793.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"793.5,-301 806.5,-301 \" stroke=\"#000000\"/>\n",
-       "<polygon fill=\"none\" points=\"603.5,-280 603.5,-301 652.5,-301 652.5,-280 603.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"606.5\" y=\"-286.8\">#cnt/dst</text>\n",
-       "<polygon fill=\"none\" points=\"652.5,-280 652.5,-301 673.5,-301 673.5,-280 652.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"656\" y=\"-286.8\">#2</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"673.5,-280 673.5,-301 686.5,-301 686.5,-280 673.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"673.5,-280 673.5,-301 686.5,-301 686.5,-280 673.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"676.5\" y=\"-286.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"686.5,-280 686.5,-301 699.5,-301 699.5,-280 686.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"686.5,-280 686.5,-301 699.5,-301 699.5,-280 686.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"689.5\" y=\"-286.8\">3</text>\n",
-       "<polygon fill=\"none\" points=\"699.5,-280 699.5,-301 720.5,-301 720.5,-280 699.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"703\" y=\"-286.8\">#2</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"720.5,-280 720.5,-301 733.5,-301 733.5,-280 720.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"720.5,-280 720.5,-301 733.5,-301 733.5,-280 720.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"723.5\" y=\"-286.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"733.5,-280 733.5,-301 746.5,-301 746.5,-280 733.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"733.5,-280 733.5,-301 746.5,-301 746.5,-280 733.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"736.5\" y=\"-286.8\">1</text>\n",
-       "<polygon fill=\"none\" points=\"746.5,-280 746.5,-301 767.5,-301 767.5,-280 746.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"750\" y=\"-286.8\">#3</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"767.5,-280 767.5,-301 780.5,-301 780.5,-280 767.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"767.5,-280 767.5,-301 780.5,-301 780.5,-280 767.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"770.5\" y=\"-286.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"780.5,-280 780.5,-301 793.5,-301 793.5,-280 780.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"780.5,-280 780.5,-301 793.5,-301 793.5,-280 780.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"783.5\" y=\"-286.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"793.5,-280 793.5,-301 806.5,-301 806.5,-280 793.5,-280\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"793.5,-280 793.5,-301 806.5,-301 806.5,-280 793.5,-280\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"796.5\" y=\"-286.8\">2</text>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"599.5,-301 599.5,-322 648.5,-322 648.5,-301 599.5,-301\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"599.5,-301 648.5,-301 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"610\" y=\"-307.8\">dests</text>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"648.5,-301 648.5,-322 669.5,-322 669.5,-301 648.5,-301\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"648.5,-301 669.5,-301 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"651.5\" y=\"-307.8\">~0</text>\n",
+       "<polyline fill=\"none\" points=\"669.5,-301 682.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"682.5,-301 695.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"695.5,-301 695.5,-322 716.5,-322 716.5,-301 695.5,-301\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"695.5,-301 716.5,-301 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"698.5\" y=\"-307.8\">~3</text>\n",
+       "<polyline fill=\"none\" points=\"716.5,-301 729.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"729.5,-301 742.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"742.5,-301 742.5,-322 763.5,-322 763.5,-301 742.5,-301\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"742.5,-301 763.5,-301 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"745.5\" y=\"-307.8\">~6</text>\n",
+       "<polyline fill=\"none\" points=\"763.5,-301 776.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"776.5,-301 789.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"789.5,-301 802.5,-301 \" stroke=\"#000000\"/>\n",
+       "<polygon fill=\"none\" points=\"599.5,-280 599.5,-301 648.5,-301 648.5,-280 599.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"602.5\" y=\"-286.8\">#cnt/dst</text>\n",
+       "<polygon fill=\"none\" points=\"648.5,-280 648.5,-301 669.5,-301 669.5,-280 648.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"652\" y=\"-286.8\">#2</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"669.5,-280 669.5,-301 682.5,-301 682.5,-280 669.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"669.5,-280 669.5,-301 682.5,-301 682.5,-280 669.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"672.5\" y=\"-286.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"682.5,-280 682.5,-301 695.5,-301 695.5,-280 682.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"682.5,-280 682.5,-301 695.5,-301 695.5,-280 682.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"685.5\" y=\"-286.8\">3</text>\n",
+       "<polygon fill=\"none\" points=\"695.5,-280 695.5,-301 716.5,-301 716.5,-280 695.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"699\" y=\"-286.8\">#2</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"716.5,-280 716.5,-301 729.5,-301 729.5,-280 716.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"716.5,-280 716.5,-301 729.5,-301 729.5,-280 716.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"719.5\" y=\"-286.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"729.5,-280 729.5,-301 742.5,-301 742.5,-280 729.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"729.5,-280 729.5,-301 742.5,-301 742.5,-280 729.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"732.5\" y=\"-286.8\">1</text>\n",
+       "<polygon fill=\"none\" points=\"742.5,-280 742.5,-301 763.5,-301 763.5,-280 742.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"746\" y=\"-286.8\">#3</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"763.5,-280 763.5,-301 776.5,-301 776.5,-280 763.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"763.5,-280 763.5,-301 776.5,-301 776.5,-280 763.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"766.5\" y=\"-286.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"776.5,-280 776.5,-301 789.5,-301 789.5,-280 776.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"776.5,-280 776.5,-301 789.5,-301 789.5,-280 776.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"779.5\" y=\"-286.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"789.5,-280 789.5,-301 802.5,-301 802.5,-280 789.5,-280\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"789.5,-280 789.5,-301 802.5,-301 802.5,-280 789.5,-280\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"792.5\" y=\"-286.8\">2</text>\n",
        "</g>\n",
        "<!-- meta -->\n",
        "<g class=\"node\" id=\"node4\">\n",
@@ -4115,26 +4115,26 @@
        "<!-- props -->\n",
        "<g class=\"node\" id=\"node5\">\n",
        "<title>props</title>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-180.8\">prop_state_acc:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-180.8\">maybe</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"281.5\" y=\"-161.8\">prop_inherently_weak:</text>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"425.5\" y=\"-161.8\">maybe</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"477.5\" y=\"-172.8\">1</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"525.5\" y=\"-172.8\">~0</text>\n",
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-       "<polygon fill=\"none\" points=\"546.5,-166 546.5,-187 573.5,-187 573.5,-166 546.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"552.5\" y=\"-172.8\">~3</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"576.5\" y=\"-172.8\">~10</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"181.5\" y=\"-151.8\">next_succ</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"302.5\" y=\"-151.8\">8</text>\n",
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-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"553\" y=\"-151.8\">10</text>\n",
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+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"519.5\" y=\"-172.8\">~0</text>\n",
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+       "<polygon fill=\"none\" points=\"540.5,-166 540.5,-187 567.5,-187 567.5,-166 540.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"546.5\" y=\"-172.8\">~3</text>\n",
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+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"180.5\" y=\"-151.8\">next_succ</text>\n",
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        "<title>dests</title>\n",
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-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2950267b40> >"
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+       "<polygon fill=\"none\" points=\"239.5,-124 239.5,-145 286.5,-145 286.5,-124 239.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"259.5\" y=\"-130.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"286.5,-124 286.5,-145 329.5,-145 329.5,-124 286.5,-124\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"286.5,-124 286.5,-145 329.5,-145 329.5,-124 286.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"304.5\" y=\"-130.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"329.5,-124 329.5,-145 356.5,-145 356.5,-124 329.5,-124\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"329.5,-124 329.5,-145 356.5,-145 356.5,-124 329.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"339.5\" y=\"-130.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"356.5,-124 356.5,-145 403.5,-145 403.5,-124 356.5,-124\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"356.5,-124 356.5,-145 403.5,-145 403.5,-124 356.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"376.5\" y=\"-130.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"403.5,-124 403.5,-145 446.5,-145 446.5,-124 403.5,-124\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"403.5,-124 403.5,-145 446.5,-145 446.5,-124 403.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"421.5\" y=\"-130.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"446.5,-124 446.5,-145 484.5,-145 484.5,-124 446.5,-124\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"446.5,-124 446.5,-145 484.5,-145 484.5,-124 446.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"462\" y=\"-130.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"484.5,-124 484.5,-145 521.5,-145 521.5,-124 484.5,-124\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"484.5,-124 484.5,-145 521.5,-145 521.5,-124 484.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"499.5\" y=\"-130.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"521.5,-124 521.5,-145 541.5,-145 541.5,-124 521.5,-124\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"521.5,-124 521.5,-145 541.5,-145 541.5,-124 521.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"528\" y=\"-130.8\">2</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"541.5,-124 541.5,-145 568.5,-145 568.5,-124 541.5,-124\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"541.5,-124 541.5,-145 568.5,-145 568.5,-124 541.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"551.5\" y=\"-130.8\">3</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"568.5,-124 568.5,-145 595.5,-145 595.5,-124 568.5,-124\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"568.5,-124 568.5,-145 595.5,-145 595.5,-124 568.5,-124\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"578.5\" y=\"-130.8\">3</text>\n",
        "</g>\n",
        "<!-- dests -->\n",
        "<g class=\"node\" id=\"node3\">\n",
        "<title>dests</title>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"634.5,-187 634.5,-208 683.5,-208 683.5,-187 634.5,-187\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"634.5,-187 683.5,-187 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"645\" y=\"-193.8\">dests</text>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"683.5,-187 683.5,-208 704.5,-208 704.5,-187 683.5,-187\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"683.5,-187 704.5,-187 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"686.5\" y=\"-193.8\">~0</text>\n",
-       "<polyline fill=\"none\" points=\"704.5,-187 717.5,-187 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"717.5,-187 730.5,-187 \" stroke=\"#000000\"/>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"730.5,-187 730.5,-208 751.5,-208 751.5,-187 730.5,-187\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"730.5,-187 751.5,-187 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"733.5\" y=\"-193.8\">~3</text>\n",
-       "<polyline fill=\"none\" points=\"751.5,-187 764.5,-187 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"764.5,-187 777.5,-187 \" stroke=\"#000000\"/>\n",
-       "<polygon fill=\"#ffc0cb\" points=\"777.5,-187 777.5,-208 798.5,-208 798.5,-187 777.5,-187\" stroke=\"transparent\"/>\n",
-       "<polyline fill=\"none\" points=\"777.5,-187 798.5,-187 \" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"780.5\" y=\"-193.8\">~6</text>\n",
-       "<polyline fill=\"none\" points=\"798.5,-187 811.5,-187 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"811.5,-187 824.5,-187 \" stroke=\"#000000\"/>\n",
-       "<polyline fill=\"none\" points=\"824.5,-187 837.5,-187 \" stroke=\"#000000\"/>\n",
-       "<polygon fill=\"none\" points=\"634.5,-166 634.5,-187 683.5,-187 683.5,-166 634.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"637.5\" y=\"-172.8\">#cnt/dst</text>\n",
-       "<polygon fill=\"none\" points=\"683.5,-166 683.5,-187 704.5,-187 704.5,-166 683.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"687\" y=\"-172.8\">#2</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"704.5,-166 704.5,-187 717.5,-187 717.5,-166 704.5,-166\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"704.5,-166 704.5,-187 717.5,-187 717.5,-166 704.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"707.5\" y=\"-172.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"717.5,-166 717.5,-187 730.5,-187 730.5,-166 717.5,-166\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"717.5,-166 717.5,-187 730.5,-187 730.5,-166 717.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"720.5\" y=\"-172.8\">3</text>\n",
-       "<polygon fill=\"none\" points=\"730.5,-166 730.5,-187 751.5,-187 751.5,-166 730.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"734\" y=\"-172.8\">#2</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"751.5,-166 751.5,-187 764.5,-187 764.5,-166 751.5,-166\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"751.5,-166 751.5,-187 764.5,-187 764.5,-166 751.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"754.5\" y=\"-172.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"764.5,-166 764.5,-187 777.5,-187 777.5,-166 764.5,-166\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"764.5,-166 764.5,-187 777.5,-187 777.5,-166 764.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"767.5\" y=\"-172.8\">1</text>\n",
-       "<polygon fill=\"none\" points=\"777.5,-166 777.5,-187 798.5,-187 798.5,-166 777.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"781\" y=\"-172.8\">#3</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"798.5,-166 798.5,-187 811.5,-187 811.5,-166 798.5,-166\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"798.5,-166 798.5,-187 811.5,-187 811.5,-166 798.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"801.5\" y=\"-172.8\">0</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"811.5,-166 811.5,-187 824.5,-187 824.5,-166 811.5,-166\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"811.5,-166 811.5,-187 824.5,-187 824.5,-166 811.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"814.5\" y=\"-172.8\">1</text>\n",
-       "<polygon fill=\"#ffff00\" points=\"824.5,-166 824.5,-187 837.5,-187 837.5,-166 824.5,-166\" stroke=\"transparent\"/>\n",
-       "<polygon fill=\"none\" points=\"824.5,-166 824.5,-187 837.5,-187 837.5,-166 824.5,-166\" stroke=\"#000000\"/>\n",
-       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"827.5\" y=\"-172.8\">2</text>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"629.5,-187 629.5,-208 678.5,-208 678.5,-187 629.5,-187\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"629.5,-187 678.5,-187 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"640\" y=\"-193.8\">dests</text>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"678.5,-187 678.5,-208 699.5,-208 699.5,-187 678.5,-187\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"678.5,-187 699.5,-187 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"681.5\" y=\"-193.8\">~0</text>\n",
+       "<polyline fill=\"none\" points=\"699.5,-187 712.5,-187 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"712.5,-187 725.5,-187 \" stroke=\"#000000\"/>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"725.5,-187 725.5,-208 746.5,-208 746.5,-187 725.5,-187\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"725.5,-187 746.5,-187 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"728.5\" y=\"-193.8\">~3</text>\n",
+       "<polyline fill=\"none\" points=\"746.5,-187 759.5,-187 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"759.5,-187 772.5,-187 \" stroke=\"#000000\"/>\n",
+       "<polygon fill=\"#ffc0cb\" points=\"772.5,-187 772.5,-208 793.5,-208 793.5,-187 772.5,-187\" stroke=\"transparent\"/>\n",
+       "<polyline fill=\"none\" points=\"772.5,-187 793.5,-187 \" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"775.5\" y=\"-193.8\">~6</text>\n",
+       "<polyline fill=\"none\" points=\"793.5,-187 806.5,-187 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"806.5,-187 819.5,-187 \" stroke=\"#000000\"/>\n",
+       "<polyline fill=\"none\" points=\"819.5,-187 832.5,-187 \" stroke=\"#000000\"/>\n",
+       "<polygon fill=\"none\" points=\"629.5,-166 629.5,-187 678.5,-187 678.5,-166 629.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"632.5\" y=\"-172.8\">#cnt/dst</text>\n",
+       "<polygon fill=\"none\" points=\"678.5,-166 678.5,-187 699.5,-187 699.5,-166 678.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"682\" y=\"-172.8\">#2</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"699.5,-166 699.5,-187 712.5,-187 712.5,-166 699.5,-166\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"699.5,-166 699.5,-187 712.5,-187 712.5,-166 699.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"702.5\" y=\"-172.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"712.5,-166 712.5,-187 725.5,-187 725.5,-166 712.5,-166\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"712.5,-166 712.5,-187 725.5,-187 725.5,-166 712.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"715.5\" y=\"-172.8\">3</text>\n",
+       "<polygon fill=\"none\" points=\"725.5,-166 725.5,-187 746.5,-187 746.5,-166 725.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"729\" y=\"-172.8\">#2</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"746.5,-166 746.5,-187 759.5,-187 759.5,-166 746.5,-166\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"746.5,-166 746.5,-187 759.5,-187 759.5,-166 746.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"749.5\" y=\"-172.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"759.5,-166 759.5,-187 772.5,-187 772.5,-166 759.5,-166\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"759.5,-166 759.5,-187 772.5,-187 772.5,-166 759.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"762.5\" y=\"-172.8\">1</text>\n",
+       "<polygon fill=\"none\" points=\"772.5,-166 772.5,-187 793.5,-187 793.5,-166 772.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"776\" y=\"-172.8\">#3</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"793.5,-166 793.5,-187 806.5,-187 806.5,-166 793.5,-166\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"793.5,-166 793.5,-187 806.5,-187 806.5,-166 793.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"796.5\" y=\"-172.8\">0</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"806.5,-166 806.5,-187 819.5,-187 819.5,-166 806.5,-166\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"806.5,-166 806.5,-187 819.5,-187 819.5,-166 806.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"809.5\" y=\"-172.8\">1</text>\n",
+       "<polygon fill=\"#ffff00\" points=\"819.5,-166 819.5,-187 832.5,-187 832.5,-166 819.5,-166\" stroke=\"transparent\"/>\n",
+       "<polygon fill=\"none\" points=\"819.5,-166 819.5,-187 832.5,-187 832.5,-166 819.5,-166\" stroke=\"#000000\"/>\n",
+       "<text fill=\"#000000\" font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"start\" x=\"822.5\" y=\"-172.8\">2</text>\n",
        "</g>\n",
        "<!-- meta -->\n",
        "<g class=\"node\" id=\"node4\">\n",
@@ -5302,7 +5302,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2950267270> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7e3c3cf030> >"
       ]
      },
      "metadata": {},
@@ -5593,7 +5593,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2950267270> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7e3c3cf030> >"
       ]
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      "metadata": {},
@@ -5802,7 +5802,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.4"
+   "version": "3.7.3"
   }
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  "nbformat": 4,