From f6607f1a2c7695be9d59aa5ee5dabf60510afa2d Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Thu, 18 May 2017 16:46:11 +0200
Subject: [PATCH 01/13] bin: release all subformulas between runs

Fixes #262, reported by Maximilien Colange.

* bin/common_output.cc, bin/common_aoutput.cc, bin/common_aoutput.hh:
Clear the set of atomic propositions if --stats=%[...]x was used.
* spot/twa/bdddict.cc: Release any formula associated to a BDD when it
is unregistered, do not wait for the dictionary's destruction.  This
was the main culprit for #262.
* tests/core/ltl2tgba.test: Add test cases.
* NEWS: Mention the bug.
---
 NEWS                     |  6 +++++-
 bin/common_aoutput.cc    |  2 ++
 bin/common_aoutput.hh    |  6 +++++-
 bin/common_output.cc     |  8 +++++++-
 spot/twa/bdddict.cc      | 14 +++++---------
 tests/core/ltl2tgba.test | 17 +++++++++++++++++
 6 files changed, 41 insertions(+), 12 deletions(-)

diff --git a/NEWS b/NEWS
index 90cf66bb0..a939abeac 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,10 @@
 New in spot 2.3.4.dev (not yet released)
 
-  Nothing yet.
+  Bugs fixed:
+
+  - We have fixed new cases where translating multiple formula in a
+    single ltl2tgba run could produce automata different from those
+    produced by individual runs.
 
 New in spot 2.3.4 (2017-05-11)
 
diff --git a/bin/common_aoutput.cc b/bin/common_aoutput.cc
index 182caf2ba..18a9ef6fb 100644
--- a/bin/common_aoutput.cc
+++ b/bin/common_aoutput.cc
@@ -513,6 +513,8 @@ hoa_stat_printer::print(const spot::const_parsed_aut_ptr& haut,
   output_aut_ = nullptr;
   input_aut_ = nullptr;
   haut_scc_.reset();
+  aut_ap_.clear();
+  haut_ap_.clear();
   return res;
 }
 
diff --git a/bin/common_aoutput.hh b/bin/common_aoutput.hh
index 83a774438..678b65bea 100644
--- a/bin/common_aoutput.hh
+++ b/bin/common_aoutput.hh
@@ -121,11 +121,15 @@ protected:
               });
   }
 public:
+  void clear()
+  {
+    val_.clear();
+  }
 
   template<class T>
   void set(T begin, T end)
   {
-    val_.clear();
+    clear();
     val_.insert(val_.end(), begin, end);
     sort();
   }
diff --git a/bin/common_output.cc b/bin/common_output.cc
index abe85a819..674d19d20 100644
--- a/bin/common_output.cc
+++ b/bin/common_output.cc
@@ -239,7 +239,13 @@ namespace
         size_ = spot::length(f);
       if (has('h'))
         class_ = spot::mp_class(f);
-      return format(format_);
+      auto& res = format(format_);
+      // Make sure we do not store the formula until the next one is
+      // printed, as the order in which APs are registered may
+      // influence the automata output.
+      fl_ = nullptr;
+      ap_.clear();
+      return res;
     }
 
   private:
diff --git a/spot/twa/bdddict.cc b/spot/twa/bdddict.cc
index 07b8280c3..ef601ad70 100644
--- a/spot/twa/bdddict.cc
+++ b/spot/twa/bdddict.cc
@@ -235,7 +235,6 @@ namespace spot
     // ME was the last user of this variable.
     // Let's free it.  First, we need to find
     // if this is a Var or an Acc variable.
-    int n = 1;
     formula f = nullptr;
     switch (bdd_map[v].type)
       {
@@ -249,21 +248,19 @@ namespace spot
         break;
       case anon:
         {
-          bdd_dict_priv::free_anonymous_list_of_type::iterator i;
           // Nobody use this variable as an anonymous variable
           // anymore, so remove it entirely from the anonymous
           // free list so it can be used for something else.
-          for (i = priv_->free_anonymous_list_of.begin();
-               i != priv_->free_anonymous_list_of.end(); ++i)
-            i->second.remove(v, n);
+          for (auto& fal: priv_->free_anonymous_list_of)
+            fal.second.remove(v, 1);
           break;
         }
       }
     // Actually release the associated BDD variables, and the
     // formula itself.
-    priv_->release_variables(v, n);
-    while (n--)
-      bdd_map[v + n].type = anon;
+    priv_->release_variables(v, 1);
+    bdd_map[v].type = anon;
+    bdd_map[v].f = nullptr;
   }
 
   void
@@ -326,7 +323,6 @@ namespace spot
   bdd_dict::assert_emptiness() const
   {
     bool fail = false;
-
     bool var_seen = false;
     bool acc_seen = false;
     bool refs_seen = false;
diff --git a/tests/core/ltl2tgba.test b/tests/core/ltl2tgba.test
index 7b82b172c..a1c08208d 100755
--- a/tests/core/ltl2tgba.test
+++ b/tests/core/ltl2tgba.test
@@ -238,3 +238,20 @@ genltl --go-theta=18 | ltl2tgba --low --any -q
 (ltl2tgba Fb ; ltl2tgba 'GFa & GFb') >out1
 ltl2tgba Fb 'GFa & GFb' >out2
 diff out1 out2
+
+# Because atomic proposition were not released by bdd_dict, different
+# order of transitions could be observed in automata output after a
+# previous translation by the same process.  (issue #262).
+ltl2tgba --low --any 'Xp1 xor (Fp1 M (!p1 M (Fp0 W p1)))' \
+         'Fp0 -> XXG(1 U Gp1)' > res1
+ltl2tgba --low --any 'Xp1 xor (Fp1 M (!p1 M (Fp0 W p1)))' >res2
+ltl2tgba --low --any 'Fp0 -> XXG(1 U Gp1)' >>res2
+diff res1 res2
+
+# The same should work when printing SCCs or atomic propositions
+s='--stats=%c,%[,]x'
+ltl2tgba --low --any 'Xp1 xor (Fp1 M (!p1 M (Fp0 W p1)))' \
+         'Fp0 -> XXG(1 U Gp1)' "$s" >res1
+ltl2tgba --low --any 'Xp1 xor (Fp1 M (!p1 M (Fp0 W p1)))' "$s" >res2
+ltl2tgba --low --any 'Fp0 -> XXG(1 U Gp1)' "$s" >>res2
+diff res1 res2

From 7b6cfd448c29319d9ddcc7e854c62f821dd1d738 Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Wed, 31 May 2017 17:14:52 +0200
Subject: [PATCH 02/13] dot: fix printing of alternating automata

Related to #208.

* spot/twaalgos/dot.cc: Fix missing definitions of universal nodes,
and inclusion of universal nodes inside of SCC when none of the
destination comes back to the SCC.
* tests/python/_altscc.ipynb: Adjust and add more test cases.
* tests/core/alternating.test, tests/core/neverclaimread.test,
tests/core/readsave.test, tests/core/sccdot.test,
tests/python/decompose.ipynb: Adjust test cases.
* NEWS: Mention the bug.
---
 NEWS                           |    5 +
 spot/twaalgos/dot.cc           |  211 +++--
 tests/core/alternating.test    |  220 ++---
 tests/core/neverclaimread.test |    8 +-
 tests/core/readsave.test       |    8 +-
 tests/core/sccdot.test         |   42 +-
 tests/python/_altscc.ipynb     |  717 ++++++++++++---
 tests/python/decompose.ipynb   | 1536 ++++++++++++++++----------------
 8 files changed, 1593 insertions(+), 1154 deletions(-)

diff --git a/NEWS b/NEWS
index a939abeac..86bb18e02 100644
--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,11 @@ New in spot 2.3.4.dev (not yet released)
     single ltl2tgba run could produce automata different from those
     produced by individual runs.
 
+  - The print_dot() function had a couple of issues when printing
+    alternating automata: in particular, when using flag 's' (display
+    SCC) or 'y' (split universal destination by colors) universal
+    edges could be connected to undefined states.
+
 New in spot 2.3.4 (2017-05-11)
 
   Bugs fixed:
diff --git a/spot/twaalgos/dot.cc b/spot/twaalgos/dot.cc
index fd1d7e263..a71b9fddb 100644
--- a/spot/twaalgos/dot.cc
+++ b/spot/twaalgos/dot.cc
@@ -69,6 +69,8 @@ namespace spot
       std::vector<std::pair<unsigned, unsigned>>* sprod_ = nullptr;
       std::set<unsigned>* incomplete_ = nullptr;
       std::string* name_ = nullptr;
+      std::map<std::pair<int, int>, int> univ_done;
+
       acc_cond::mark_t inf_sets_ = 0U;
       acc_cond::mark_t fin_sets_ = 0U;
       unsigned opt_shift_sets_ = 0;
@@ -366,28 +368,39 @@ namespace spot
         return bdd_format_formula(aut_->get_dict(), label);
       }
 
-      std::set<std::pair<int, int>> done;
-
-      void
-      print_dst(int dst, const char* style = nullptr, int scc_num = -1,
-                int color_num = -1)
+      std::string string_dst(int dst, int color_num = -1)
       {
         std::ostringstream tmp_dst;
         tmp_dst << dst;
-        if (scc_num >= 0)
-          tmp_dst << '.' << scc_num;
-        if (!done.emplace(std::make_pair(dst, color_num)).second)
-          return;
-        else if (!opt_shared_univ_dest_ && color_num > 0)
+        if (!opt_shared_univ_dest_ && color_num >= 0)
           tmp_dst << '.' << color_num;
-        std::string dest = tmp_dst.str();
-        os_ << "    " << dest << " [label=<>,shape=point]\n";
-        for (unsigned d: aut_->univ_dests(dst))
+        return tmp_dst.str();
+      }
+
+      void
+      print_dst(int dst, bool print_edges = false,
+                const char* style = nullptr, int color_num = -1)
+      {
+        int& univ = univ_done[std::make_pair(dst, color_num)];
+        if (univ == 2)
+          return;
+        std::string dest = string_dst(dst, color_num);
+        if (univ == 0)
+          os_ << "  " << dest << " [label=<>,shape=point]\n";
+        if (print_edges)
           {
-            os_ << "    " << dest << " -> " << d;
-            if (style && *style)
-              os_ << " [" << style << ']';
-            os_ << '\n';
+            for (unsigned d: aut_->univ_dests(dst))
+              {
+                os_ << "  " << dest << " -> " << d;
+                if (style && *style)
+                  os_ << " [" << style << ']';
+                os_ << '\n';
+              }
+            univ = 2;
+          }
+        else
+          {
+            univ = 1;
           }
       }
 
@@ -478,14 +491,9 @@ namespace spot
         int init = (int) aut_->get_init_state_number();
         os_ << "=0]\n  I -> " << init;
         if (init >= 0)
-          {
-            os_ << '\n';
-          }
+          os_ << '\n';
         else
-          {
-            os_ << " [arrowhead=onormal]\n";
-            print_dst(init);
-          }
+          os_ << " [arrowhead=onormal]\n";
       }
 
       void
@@ -586,63 +594,63 @@ namespace spot
 
       void
       process_link(const twa_graph::edge_storage_t& t, int number,
-                   int scc_num = -1)
+                   bool print_edges)
       {
-        os_ << "  " << t.src << " -> " << (int)t.dst;
-        if (scc_num >= 0)
+        if (print_edges)
           {
-            os_ << '.' << scc_num;
-          }
-        if (aut_->is_univ_dest(t.dst) && highlight_edges_
-            && !opt_shared_univ_dest_)
-          {
-            auto idx = aut_->get_graph().index_of_edge(t);
-            auto iter = highlight_edges_->find(idx);
-            os_ << '.' << iter->second % palette_mod;
-          }
-        std::string label;
-        if (!opt_state_labels_)
-          label = bdd_format_formula(aut_->get_dict(), t.cond);
-        if (!opt_html_labels_)
-          {
-            os_ << " [label=\"";
-            escape_str(os_, label);
-            if (!mark_states_)
-              if (auto a = t.acc)
-                {
-                  if (!opt_state_labels_)
-                    os_ << "\\n";
-                  output_set(a);
-                }
-            os_ << '"';
-          }
-        else
-          {
-            os_ << " [label=<";
-            escape_html(os_, label);
-            if (!mark_states_)
-              if (auto a = t.acc)
-                {
-                  if (!opt_state_labels_)
-                    os_ << "<br/>";
-                  output_html_set(a);
-                }
-            os_ << '>';
-          }
-        if (opt_ordered_edges_ || opt_numbered_edges_)
-          {
-            os_ << ", taillabel=\"";
-            if (opt_ordered_edges_)
-              os_ << number;
-            if (opt_ordered_edges_ && opt_numbered_edges_)
-              os_ << ' ';
-            if (opt_numbered_edges_)
-              os_ << '#' << aut_->get_graph().index_of_edge(t);
-            os_ << '"';
+            os_ << "  " << t.src << " -> " << (int)t.dst;
+            if (aut_->is_univ_dest(t.dst) && highlight_edges_
+                && !opt_shared_univ_dest_)
+              {
+                auto idx = aut_->get_graph().index_of_edge(t);
+                auto iter = highlight_edges_->find(idx);
+                if (iter != highlight_edges_->end())
+                  os_ << '.' << iter->second % palette_mod;
+              }
+            std::string label;
+            if (!opt_state_labels_)
+              label = bdd_format_formula(aut_->get_dict(), t.cond);
+            if (!opt_html_labels_)
+              {
+                os_ << " [label=\"";
+                escape_str(os_, label);
+                if (!mark_states_)
+                  if (auto a = t.acc)
+                    {
+                      if (!opt_state_labels_)
+                        os_ << "\\n";
+                      output_set(a);
+                    }
+                os_ << '"';
+              }
+            else
+              {
+                os_ << " [label=<";
+                escape_html(os_, label);
+                if (!mark_states_)
+                  if (auto a = t.acc)
+                    {
+                      if (!opt_state_labels_)
+                        os_ << "<br/>";
+                      output_html_set(a);
+                    }
+                os_ << '>';
+              }
+            if (opt_ordered_edges_ || opt_numbered_edges_)
+              {
+                os_ << ", taillabel=\"";
+                if (opt_ordered_edges_)
+                  os_ << number;
+                if (opt_ordered_edges_ && opt_numbered_edges_)
+                  os_ << ' ';
+                if (opt_numbered_edges_)
+                  os_ << '#' << aut_->get_graph().index_of_edge(t);
+                os_ << '"';
+              }
           }
 
         std::string highlight;
-        auto color_num = -1;
+        int color_num = -1;
         if (highlight_edges_)
           {
             auto idx = aut_->get_graph().index_of_edge(t);
@@ -654,21 +662,20 @@ namespace spot
                   << palette[iter->second % palette_mod]
                   << '"';
                 highlight = o.str();
-                os_ << ", " << highlight;
+                if (print_edges)
+                  os_ << ", " << highlight;
                 if (!opt_shared_univ_dest_)
                   color_num = iter->second % palette_mod;
               }
           }
-        if (aut_->is_univ_dest(t.dst))
-          os_ << ", arrowhead=onormal";
-        os_ << "]\n";
-        if (aut_->is_univ_dest(t.dst))
+        if (print_edges)
           {
-            if (color_num >= 0)
-              print_dst(t.dst, highlight.c_str(), scc_num, color_num);
-            else
-              print_dst(t.dst, highlight.c_str(), scc_num);
+            if (aut_->is_univ_dest(t.dst))
+              os_ << ", arrowhead=onormal";
+            os_ << "]\n";
           }
+        if (aut_->is_univ_dest(t.dst))
+          print_dst(t.dst, print_edges, highlight.c_str(), color_num);
       }
 
       void print(const const_twa_graph_ptr& aut)
@@ -773,39 +780,29 @@ namespace spot
                   {
                     process_state(s);
                     int trans_num = 0;
+                    unsigned scc_of_s = si->scc_of(s);
                     for (auto& t : aut_->out(s))
-                      {
-                        if (aut_->is_univ_dest(t.dst))
+                      for (unsigned d: aut_->univ_dests(t.dst))
+                        if (si->scc_of(d) == scc_of_s)
                           {
-                            bool to_write = false;
-                            for (unsigned d: aut_->univ_dests(t.dst))
-                              {
-                                to_write = si->scc_of(d) == si->scc_of(s);
-                                if (to_write)
-                                    break;
-                              }
-                            if (to_write)
-                              process_link(t, trans_num++, i);
-                            else
-                              process_link(t, trans_num++);
+                            process_link(t, trans_num++, false);
+                            break;
                           }
-                         else
-                           process_link(t, trans_num++);
-                      }
                   }
                 os_ << "  }\n";
               }
           }
+        int init = (int) aut_->get_init_state_number();
+        if (init < 0)
+          print_dst(init, true);
         unsigned ns = aut_->num_states();
         for (unsigned n = 0; n < ns; ++n)
           {
             if (!si || !si->reachable_state(n))
-              {
-                process_state(n);
-                int trans_num = 0;
-                for (auto& t: aut_->out(n))
-                  process_link(t, trans_num++);
-              }
+              process_state(n);
+            int trans_num = 0;
+            for (auto& t: aut_->out(n))
+              process_link(t, trans_num++, true);
           }
         end();
       }
diff --git a/tests/core/alternating.test b/tests/core/alternating.test
index 6b51c42a5..a0878c310 100755
--- a/tests/core/alternating.test
+++ b/tests/core/alternating.test
@@ -62,66 +62,66 @@ digraph G {
   labelloc="t"
   I [label="", style=invis, width=0]
   I -> -11 [arrowhead=onormal]
-    -11 [label=<>,shape=point]
-    -11 -> 0
-    -11 -> 2
   subgraph cluster_0 {
   color=green
   label=""
   2 [label="G(a)"]
-  2 -> 2 [label="a"]
   }
   subgraph cluster_1 {
   color=red
   label=""
   1 [label="FG(a)\n⓿"]
-  1 -> 2 [label="a"]
-  1 -> 1 [label="1"]
   }
   subgraph cluster_2 {
   color=green
   label=""
   6 [label="t"]
-  6 -> 6 [label="1"]
   }
   subgraph cluster_3 {
   color=red
   label=""
   4 [label="F(b)\n⓿"]
-  4 -> 6 [label="b"]
-  4 -> 4 [label="!b"]
   }
   subgraph cluster_4 {
   color=green
   label=""
   3 [label="GF(b)"]
-  3 -> 3 [label="b"]
-  3 -> -8.4 [label="!b", style=bold, color="#FAA43A", arrowhead=onormal]
-    -8.4 [label=<>,shape=point]
-    -8.4 -> 3 [style=bold, color="#FAA43A"]
-    -8.4 -> 4 [style=bold, color="#FAA43A"]
+  -8 [label=<>,shape=point]
   }
   subgraph cluster_5 {
   color=red
   label=""
   5 [label="((a) U (b))\n⓿"]
-  5 -> 6 [label="b"]
-  5 -> 5 [label="a & !b"]
   }
   subgraph cluster_6 {
   color=black
   label=""
   0 [label="((((a) U (b)) && GF(b)) && FG(a))"]
-  0 -> -1 [label="b", arrowhead=onormal]
-    -1 [label=<>,shape=point]
-    -1 -> 1
-    -1 -> 3
-  0 -> -4 [label="a & !b", style=bold, color="#F15854", arrowhead=onormal]
-    -4 [label=<>,shape=point]
-    -4 -> 1 [style=bold, color="#F15854"]
-    -4 -> 3 [style=bold, color="#F15854"]
-    -4 -> 5 [style=bold, color="#F15854"]
   }
+  -11 [label=<>,shape=point]
+  -11 -> 0
+  -11 -> 2
+  0 -> -1 [label="b", arrowhead=onormal]
+  -1 [label=<>,shape=point]
+  -1 -> 1
+  -1 -> 3
+  0 -> -4 [label="a & !b", style=bold, color="#F15854", arrowhead=onormal]
+  -4 [label=<>,shape=point]
+  -4 -> 1 [style=bold, color="#F15854"]
+  -4 -> 3 [style=bold, color="#F15854"]
+  -4 -> 5 [style=bold, color="#F15854"]
+  1 -> 2 [label="a"]
+  1 -> 1 [label="1"]
+  2 -> 2 [label="a"]
+  3 -> 3 [label="b"]
+  3 -> -8 [label="!b", style=bold, color="#FAA43A", arrowhead=onormal]
+  -8 -> 3 [style=bold, color="#FAA43A"]
+  -8 -> 4 [style=bold, color="#FAA43A"]
+  4 -> 6 [label="b"]
+  4 -> 4 [label="!b"]
+  5 -> 6 [label="b"]
+  5 -> 5 [label="a & !b"]
+  6 -> 6 [label="1"]
 }
 EOF
 
@@ -508,19 +508,19 @@ digraph G {
   edge [fontname="Lato"]
   I [label="", style=invis, width=0]
   I -> -1 [arrowhead=onormal]
-    -1 [label=<>,shape=point]
-    -1 -> 0
-    -1 -> 1
+  -1 [label=<>,shape=point]
+  -1 -> 0
+  -1 -> 1
   0 [label=<0>]
   0 -> 0 [label=<!a &amp; !c>]
   0 -> -1.1 [label=<a &amp; b &amp; !c>, style=bold, color="#F17CB0", $style]
-    -1.1 [label=<>,shape=point]
-    -1.1 -> 0 [style=bold, color="#F17CB0"]
-    -1.1 -> 1 [style=bold, color="#F17CB0"]
+  -1.1 [label=<>,shape=point]
+  -1.1 -> 0 [style=bold, color="#F17CB0"]
+  -1.1 -> 1 [style=bold, color="#F17CB0"]
   0 -> -1.2 [label=<a &amp; !c>, style=bold, color="#FAA43A", $style]
-    -1.2 [label=<>,shape=point]
-    -1.2 -> 0 [style=bold, color="#FAA43A"]
-    -1.2 -> 1 [style=bold, color="#FAA43A"]
+  -1.2 [label=<>,shape=point]
+  -1.2 -> 0 [style=bold, color="#FAA43A"]
+  -1.2 -> 1 [style=bold, color="#FAA43A"]
   1 [label=<1>]
   1 -> 1 [label=<b>]
 }
@@ -574,52 +574,52 @@ digraph G {
   color=green
   label=""
   4 [label="t"]
-  4 -> 4 [label=<1>]
   }
   subgraph cluster_1 {
   color=green
   label=""
   1 [label="G(a & b)"]
-  1 -> 1 [label=<a &amp; b>]
   }
   subgraph cluster_2 {
   color=red
   label=""
   2 [label="F!a"]
-  2 -> 4 [label=<!a>]
-  2 -> 2 [label=<a<br/><font color="#F17CB0">❶</font>>]
   }
   subgraph cluster_3 {
   color=red
   label=""
   3 [label="F!b"]
-  3 -> 4 [label=<!b>]
-  3 -> 3 [label=<b<br/><font color="#5DA5DA">⓿</font>>]
   }
   subgraph cluster_4 {
   color=green
   label=""
   0 [label="c R (c | G(a & b) | (F!b & F!a))"]
+  -1 [label=<>,shape=point]
+  -4 [label=<>,shape=point]
+  -7 [label=<>,shape=point]
+  -10 [label=<>,shape=point]
+  }
   0 -> 4 [label=<c>]
   0 -> 0 [label=<!a &amp; !b &amp; !c>]
-  0 -> -1.4 [label=<a &amp; b &amp; !c>, arrowhead=onormal]
-    -1.4 [label=<>,shape=point]
-    -1.4 -> 0
-    -1.4 -> 1
-  0 -> -4.4 [label=<a &amp; !b &amp; !c>, arrowhead=onormal]
-    -4.4 [label=<>,shape=point]
-    -4.4 -> 0
-    -4.4 -> 2
-  0 -> -7.4 [label=<!a &amp; b &amp; !c>, arrowhead=onormal]
-    -7.4 [label=<>,shape=point]
-    -7.4 -> 0
-    -7.4 -> 3
-  0 -> -10.4 [label=<a &amp; b &amp; !c>, arrowhead=onormal]
-    -10.4 [label=<>,shape=point]
-    -10.4 -> 0
-    -10.4 -> 2
-    -10.4 -> 3
-  }
+  0 -> -1 [label=<a &amp; b &amp; !c>, arrowhead=onormal]
+  -1 -> 0
+  -1 -> 1
+  0 -> -4 [label=<a &amp; !b &amp; !c>, arrowhead=onormal]
+  -4 -> 0
+  -4 -> 2
+  0 -> -7 [label=<!a &amp; b &amp; !c>, arrowhead=onormal]
+  -7 -> 0
+  -7 -> 3
+  0 -> -10 [label=<a &amp; b &amp; !c>, arrowhead=onormal]
+  -10 -> 0
+  -10 -> 2
+  -10 -> 3
+  1 -> 1 [label=<a &amp; b>]
+  2 -> 4 [label=<!a>]
+  2 -> 2 [label=<a<br/><font color="#F17CB0">❶</font>>]
+  3 -> 4 [label=<!b>]
+  3 -> 3 [label=<b<br/><font color="#5DA5DA">⓿</font>>]
+  4 -> 4 [label=<1>]
 }
 EOF
 
@@ -670,48 +670,48 @@ digraph G {
   color=green
   label=""
   4 [label="t"]
-  4 -> 4 [label=<1>]
   }
   subgraph cluster_1 {
   color=red
   label=""
   2 [label="F!a"]
-  2 -> 4 [label=<!a>]
-  2 -> 2 [label=<a<br/><font color="#F17CB0">❶</font>>]
   }
   subgraph cluster_2 {
   color=red
   label=""
   3 [label="F!b"]
-  3 -> 4 [label=<!b>]
-  3 -> 3 [label=<b<br/><font color="#5DA5DA">⓿</font>>]
   }
   subgraph cluster_3 {
   color=green
   label=""
   0 [label="c R (c | G(a & b) | (F!b & F!a))"]
+  -1 [label=<>,shape=point]
+  -4 [label=<>,shape=point]
+  -7 [label=<>,shape=point]
+  1 [label="G(a & b)"]
+  -10 [label=<>,shape=point]
+  }
   0 -> 4 [label=<c>]
   0 -> 0 [label=<!a &amp; !b &amp; !c>]
-  0 -> -1.3 [label=<a &amp; b &amp; !c>, arrowhead=onormal]
-    -1.3 [label=<>,shape=point]
-    -1.3 -> 0
-    -1.3 -> 1
-  0 -> -4.3 [label=<a &amp; !b &amp; !c>, arrowhead=onormal]
-    -4.3 [label=<>,shape=point]
-    -4.3 -> 0
-    -4.3 -> 2
-  0 -> -7.3 [label=<!a &amp; b &amp; !c>, arrowhead=onormal]
-    -7.3 [label=<>,shape=point]
-    -7.3 -> 0
-    -7.3 -> 3
-  1 [label="G(a & b)"]
+  0 -> -1 [label=<a &amp; b &amp; !c>, arrowhead=onormal]
+  -1 -> 0
+  -1 -> 1
+  0 -> -4 [label=<a &amp; !b &amp; !c>, arrowhead=onormal]
+  -4 -> 0
+  -4 -> 2
+  0 -> -7 [label=<!a &amp; b &amp; !c>, arrowhead=onormal]
+  -7 -> 0
+  -7 -> 3
   1 -> 1 [label=<a &amp; b>]
-  1 -> -10.3 [label=<a &amp; b &amp; !c>, arrowhead=onormal]
-    -10.3 [label=<>,shape=point]
-    -10.3 -> 0
-    -10.3 -> 2
-    -10.3 -> 3
-  }
+  1 -> -10 [label=<a &amp; b &amp; !c>, arrowhead=onormal]
+  -10 -> 0
+  -10 -> 2
+  -10 -> 3
+  2 -> 4 [label=<!a>]
+  2 -> 2 [label=<a<br/><font color="#F17CB0">❶</font>>]
+  3 -> 4 [label=<!b>]
+  3 -> 3 [label=<b<br/><font color="#5DA5DA">⓿</font>>]
+  4 -> 4 [label=<1>]
 }
 EOF
 
@@ -749,16 +749,16 @@ digraph G {
   I -> 0
   0 [label=<0>]
   0 -> -1.1 [label=<b &amp; c>, style=bold, color="#F17CB0", arrowhead=onormal]
-    -1.1 [label=<>,shape=point]
-    -1.1 -> 1 [style=bold, color="#F17CB0"]
-    -1.1 -> 2 [style=bold, color="#F17CB0"]
+  -1.1 [label=<>,shape=point]
+  -1.1 -> 1 [style=bold, color="#F17CB0"]
+  -1.1 -> 2 [style=bold, color="#F17CB0"]
   1 [label=<1>]
   1 -> -1.1 [label=<a &amp; b>, style=bold, color="#F17CB0", arrowhead=onormal]
   2 [label=<2>]
   2 -> -1.2 [label=<!a &amp; !b &amp; !c>, style=bold, color="#FAA43A", $style]
-    -1.2 [label=<>,shape=point]
-    -1.2 -> 1 [style=bold, color="#FAA43A"]
-    -1.2 -> 2 [style=bold, color="#FAA43A"]
+  -1.2 [label=<>,shape=point]
+  -1.2 -> 1 [style=bold, color="#FAA43A"]
+  -1.2 -> 2 [style=bold, color="#FAA43A"]
 }
 EOF
 
@@ -796,19 +796,19 @@ digraph G {
   I -> 0
   0 [label=<0>]
   0 -> -1.1 [label=<b &amp; c>, style=bold, color="#F17CB0", arrowhead=onormal]
-    -1.1 [label=<>,shape=point]
-    -1.1 -> 1 [style=bold, color="#F17CB0"]
-    -1.1 -> 2 [style=bold, color="#F17CB0"]
+  -1.1 [label=<>,shape=point]
+  -1.1 -> 1 [style=bold, color="#F17CB0"]
+  -1.1 -> 2 [style=bold, color="#F17CB0"]
   1 [label=<1>]
   1 -> -1.3 [label=<a &amp; b>, style=bold, color="#B276B2", arrowhead=onormal]
-    -1.3 [label=<>,shape=point]
-    -1.3 -> 1 [style=bold, color="#B276B2"]
-    -1.3 -> 2 [style=bold, color="#B276B2"]
+  -1.3 [label=<>,shape=point]
+  -1.3 -> 1 [style=bold, color="#B276B2"]
+  -1.3 -> 2 [style=bold, color="#B276B2"]
   2 [label=<2>]
   2 -> -1.2 [label=<!a &amp; !b &amp; !c>, style=bold, color="#FAA43A", $style]
-    -1.2 [label=<>,shape=point]
-    -1.2 -> 1 [style=bold, color="#FAA43A"]
-    -1.2 -> 2 [style=bold, color="#FAA43A"]
+  -1.2 [label=<>,shape=point]
+  -1.2 -> 1 [style=bold, color="#FAA43A"]
+  -1.2 -> 2 [style=bold, color="#FAA43A"]
 }
 EOF
 
@@ -853,35 +853,35 @@ digraph G {
   color=green
   label=""
   3 [label="t"]
-  3 -> 3 [label=<1>]
   }
   subgraph cluster_1 {
   color=green
   label=""
   1 [label="Fa"]
-  1 -> 3 [label=<a>]
-  1 -> 1 [label=<!a>]
   }
   subgraph cluster_2 {
   color=green
   label=""
   2 [label="G!a"]
-  2 -> 2 [label=<!a>]
   }
   subgraph cluster_3 {
   color=green
   label=""
   0 [label="G((b & Fa) | (!b & G!a))"]
-  0 -> 0 [label=<a &amp; b>]
-  0 -> -1.3 [label=<!a &amp; b>, arrowhead=onormal]
-    -1.3 [label=<>,shape=point]
-    -1.3 -> 0
-    -1.3 -> 1
-  0 -> -4.3 [label=<!a &amp; !b>, arrowhead=onormal]
-    -4.3 [label=<>,shape=point]
-    -4.3 -> 0
-    -4.3 -> 2
+  -1 [label=<>,shape=point]
+  -4 [label=<>,shape=point]
   }
+  0 -> 0 [label=<a &amp; b>]
+  0 -> -1 [label=<!a &amp; b>, arrowhead=onormal]
+  -1 -> 0
+  -1 -> 1
+  0 -> -4 [label=<!a &amp; !b>, arrowhead=onormal]
+  -4 -> 0
+  -4 -> 2
+  1 -> 3 [label=<a>]
+  1 -> 1 [label=<!a>]
+  2 -> 2 [label=<!a>]
+  3 -> 3 [label=<1>]
 }
 EOF
 
diff --git a/tests/core/neverclaimread.test b/tests/core/neverclaimread.test
index e2f80f92e..1dd675afe 100755
--- a/tests/core/neverclaimread.test
+++ b/tests/core/neverclaimread.test
@@ -1,7 +1,7 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015 Laboratoire de
-# Recherche et Développement de l'Epita (LRDE).
+# Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2017 Laboratoire
+# de Recherche et Développement de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
 #
@@ -336,15 +336,15 @@ digraph G {
   color=green
   label=""
   1 [label="1", peripheries=2]
-  1 -> 1 [label="1"]
   }
   subgraph cluster_1 {
   color=red
   label=""
   0 [label="0"]
+  }
   0 -> 1 [label="b"]
   0 -> 0 [label="0"]
-  }
+  1 -> 1 [label="1"]
 }
 EOF
 diff stdout expected
diff --git a/tests/core/readsave.test b/tests/core/readsave.test
index 0fd2efe60..9da8a8a49 100755
--- a/tests/core/readsave.test
+++ b/tests/core/readsave.test
@@ -327,21 +327,21 @@ digraph G {
   subgraph cluster_0 {
   color=green
   1 [label="s1", peripheries=2]
-  1 -> 1 [label="a"]
   }
   subgraph cluster_1 {
   color=green
   0 [label="s0", peripheries=2]
-  0 -> 0 [label="b"]
   }
   subgraph cluster_2 {
   color=black
   3 [label="s3"]
-  3 -> 1 [label="a"]
-  3 -> 0 [label="b"]
   }
+  0 -> 0 [label="b"]
+  1 -> 1 [label="a"]
   2 [label="s2"]
   2 -> 0 [label="b"]
+  3 -> 1 [label="a"]
+  3 -> 0 [label="b"]
 }
 EOF
 
diff --git a/tests/core/sccdot.test b/tests/core/sccdot.test
index 75ddb3dfd..919467a5d 100755
--- a/tests/core/sccdot.test
+++ b/tests/core/sccdot.test
@@ -83,67 +83,67 @@ digraph G {
   color=grey
   label=""
   5 [label="5"]
-  5 -> 6 [label="1"]
   6 [label="6"]
-  6 -> 5 [label="1"]
   }
   subgraph cluster_1 {
   color=grey
   label=""
   0 [label="0"]
-  0 -> 0 [label="a & b\n{0,1,2}"]
-  0 -> 0 [label="!a & !b\n{2}"]
-  0 -> 5 [label="a\n{2}"]
   }
   subgraph cluster_2 {
   color=green
   label=""
   9 [label="9"]
-  9 -> 9 [label="!a & b\n{0,2}"]
-  9 -> 10 [label="a & b\n{0,1}"]
   10 [label="10"]
-  10 -> 9 [label="!a & b\n{0,1}"]
-  10 -> 10 [label="a & b\n{0,2}"]
   }
   subgraph cluster_3 {
   color=green
   label=""
   8 [label="8"]
-  8 -> 8 [label="!a & b\n{0,2}"]
-  8 -> 8 [label="a & b\n{0,1}"]
-  8 -> 9 [label="1"]
   }
   subgraph cluster_4 {
   color=green
   label=""
   7 [label="7"]
-  7 -> 7 [label="!a & b\n{0,1}"]
-  7 -> 7 [label="a & b\n{0,2}"]
-  7 -> 8 [label="1"]
   }
   subgraph cluster_5 {
   color=black
   label=""
   2 [label="2"]
-  2 -> 0 [label="a"]
-  2 -> 7 [label="b"]
   }
   subgraph cluster_6 {
   color=red
   label=""
   4 [label="4"]
-  4 -> 4 [label="!b\n{1,2}"]
-  4 -> 2 [label="b"]
   }
   subgraph cluster_7 {
   color=green
   label=""
   1 [label="1"]
+  3 [label="3"]
+  }
+  0 -> 0 [label="a & b\n{0,1,2}"]
+  0 -> 0 [label="!a & !b\n{2}"]
+  0 -> 5 [label="a\n{2}"]
   1 -> 4 [label="b"]
   1 -> 3 [label="a & !b"]
-  3 [label="3"]
+  2 -> 0 [label="a"]
+  2 -> 7 [label="b"]
   3 -> 1 [label="a & b\n{0,1}"]
-  }
+  4 -> 4 [label="!b\n{1,2}"]
+  4 -> 2 [label="b"]
+  5 -> 6 [label="1"]
+  6 -> 5 [label="1"]
+  7 -> 7 [label="!a & b\n{0,1}"]
+  7 -> 7 [label="a & b\n{0,2}"]
+  7 -> 8 [label="1"]
+  8 -> 8 [label="!a & b\n{0,2}"]
+  8 -> 8 [label="a & b\n{0,1}"]
+  8 -> 9 [label="1"]
+  9 -> 9 [label="!a & b\n{0,2}"]
+  9 -> 10 [label="a & b\n{0,1}"]
+  10 -> 9 [label="!a & b\n{0,1}"]
+  10 -> 10 [label="a & b\n{0,2}"]
 }
 EOF
 
diff --git a/tests/python/_altscc.ipynb b/tests/python/_altscc.ipynb
index 68964929a..4fd410b24 100644
--- a/tests/python/_altscc.ipynb
+++ b/tests/python/_altscc.ipynb
@@ -35,6 +35,7 @@
      "cell_type": "code",
      "collapsed": true,
      "input": [
+      "from IPython.display import display\n",
       "import spot\n",
       "spot.setup(show_default='.bas')"
      ],
@@ -77,74 +78,74 @@
         "<!-- Generated by graphviz version 2.38.0 (20140413.2041)\n",
         " -->\n",
         "<!-- Title: G Pages: 1 -->\n",
-        "<svg width=\"222pt\" height=\"154pt\"\n",
-        " viewBox=\"0.00 0.00 221.60 154.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 150)\">\n",
+        "<svg width=\"222pt\" height=\"206pt\"\n",
+        " viewBox=\"0.00 0.00 221.60 206.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 202)\">\n",
         "<title>G</title>\n",
-        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-150 217.6,-150 217.6,4 -4,4\"/>\n",
-        "<text text-anchor=\"start\" x=\"85.8\" y=\"-131.8\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
-        "<text text-anchor=\"start\" x=\"107.8\" y=\"-131.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
-        "<text text-anchor=\"start\" x=\"123.8\" y=\"-131.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
+        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-202 217.6,-202 217.6,4 -4,4\"/>\n",
+        "<text text-anchor=\"start\" x=\"85.8\" y=\"-183.8\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
+        "<text text-anchor=\"start\" x=\"107.8\" y=\"-183.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<text text-anchor=\"start\" x=\"123.8\" y=\"-183.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
         "<g id=\"clust1\" class=\"cluster\"><title>cluster_0</title>\n",
-        "<polygon fill=\"none\" stroke=\"green\" points=\"153.6,-8 153.6,-108 205.6,-108 205.6,-8 153.6,-8\"/>\n",
+        "<polygon fill=\"none\" stroke=\"green\" points=\"153.6,-67 153.6,-167 205.6,-167 205.6,-67 153.6,-67\"/>\n",
         "</g>\n",
         "<g id=\"clust2\" class=\"cluster\"><title>cluster_1</title>\n",
-        "<polygon fill=\"none\" stroke=\"red\" points=\"70.6,-30 70.6,-115 122.6,-115 122.6,-30 70.6,-30\"/>\n",
+        "<polygon fill=\"none\" stroke=\"red\" points=\"70.6,-8 70.6,-93 122.6,-93 122.6,-8 70.6,-8\"/>\n",
         "</g>\n",
         "<!-- I -->\n",
         "<!-- &#45;1 -->\n",
         "<g id=\"node2\" class=\"node\"><title>&#45;1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"39.8\" cy=\"-27\" rx=\"1.8\" ry=\"1.8\"/>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"39.8\" cy=\"-87\" rx=\"1.8\" ry=\"1.8\"/>\n",
         "</g>\n",
         "<!-- I&#45;&gt;&#45;1 -->\n",
         "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;&#45;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.10844,-27C2.6468,-27 20.196,-27 30.7973,-27\"/>\n",
-        "<polygon fill=\"none\" stroke=\"black\" points=\"30.9213,-29.4501 37.9213,-27 30.9212,-24.5501 30.9213,-29.4501\"/>\n",
-        "</g>\n",
-        "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"96.6\" cy=\"-56\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"96.6\" y=\"-52.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
-        "</g>\n",
-        "<!-- &#45;1&#45;&gt;0 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>&#45;1&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M41.7512,-27.5033C45.6352,-29.5588 60.7141,-37.5385 73.9308,-44.5327\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"80.2121,-47.8568 72.5516,-47.3667 77.1186,-46.2197 74.025,-44.5826 74.025,-44.5826 74.025,-44.5826 77.1186,-46.2197 75.4985,-41.7984 80.2121,-47.8568 80.2121,-47.8568\"/>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.10844,-87C2.6468,-87 20.196,-87 30.7973,-87\"/>\n",
+        "<polygon fill=\"none\" stroke=\"black\" points=\"30.9213,-89.4501 37.9213,-87 30.9212,-84.5501 30.9213,-89.4501\"/>\n",
         "</g>\n",
         "<!-- 1 -->\n",
-        "<g id=\"node4\" class=\"node\"><title>1</title>\n",
-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"179.6\" cy=\"-34\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"179.6\" y=\"-30.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"179.6\" cy=\"-93\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"179.6\" y=\"-89.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- &#45;1&#45;&gt;1 -->\n",
         "<g id=\"edge3\" class=\"edge\"><title>&#45;1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M41.9364,-26.9481C45.8913,-26.7705 59.4203,-26.1875 70.6,-26 93.7079,-25.6124 99.547,-24.3617 122.6,-26 133.061,-26.7434 144.538,-28.2585 154.363,-29.7722\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"161.511,-30.9167 154.101,-32.9203 158.055,-30.3633 154.599,-29.8099 154.599,-29.8099 154.599,-29.8099 158.055,-30.3633 155.097,-26.6995 161.511,-30.9167 161.511,-30.9167\"/>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M41.9032,-87.517C45.7496,-89.2872 58.9667,-95.1002 70.6,-97 99.2154,-101.673 132.637,-99.247 154.636,-96.5896\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"161.635,-95.6894 155.094,-99.7067 158.163,-96.1359 154.692,-96.5825 154.692,-96.5825 154.692,-96.5825 158.163,-96.1359 154.29,-93.4582 161.635,-95.6894 161.635,-95.6894\"/>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge5\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M90.2208,-73.0373C88.9189,-82.8579 91.0453,-92 96.6,-92 100.766,-92 103.004,-86.8576 103.313,-80.1433\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"102.979,-73.0373 106.454,-79.8818 103.143,-76.5335 103.308,-80.0296 103.308,-80.0296 103.308,-80.0296 103.143,-76.5335 100.161,-80.1774 102.979,-73.0373 102.979,-73.0373\"/>\n",
-        "<text text-anchor=\"start\" x=\"93.1\" y=\"-95.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
+        "<!-- 0 -->\n",
+        "<g id=\"node4\" class=\"node\"><title>0</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"96.6\" cy=\"-34\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"96.6\" y=\"-30.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;1 -->\n",
-        "<g id=\"edge6\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M114.383,-51.4416C126.191,-48.2346 142.151,-43.8996 155.206,-40.3538\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"162.115,-38.4773 156.186,-43.352 158.738,-39.3947 155.36,-40.3121 155.36,-40.3121 155.36,-40.3121 158.738,-39.3947 154.534,-37.2723 162.115,-38.4773 162.115,-38.4773\"/>\n",
-        "<text text-anchor=\"start\" x=\"132.6\" y=\"-50.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
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-     "prompt_number": 7
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "A corner case for the dot printer"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "for a in spot.automata('''\n",
+      "HOA: v1\n",
+      "States: 3\n",
+      "Start: 0\n",
+      "AP: 2 \"a\" \"b\"\n",
+      "Acceptance: 1 Fin(0)\n",
+      "--BODY--\n",
+      "State: 0\n",
+      "[0] 1&2\n",
+      "State: 1\n",
+      "[1] 1&2 {0}\n",
+      "State: 2\n",
+      "[1] 2\n",
+      "--END--\n",
+      "HOA: v1\n",
+      "States: 3\n",
+      "Start: 0\n",
+      "AP: 2 \"a\" \"b\"\n",
+      "Acceptance: 1 Fin(0)\n",
+      "--BODY--\n",
+      "State: 0\n",
+      "[0] 1&2\n",
+      "State: 1\n",
+      "[1] 1 {0}\n",
+      "State: 2\n",
+      "[1] 2\n",
+      "--END--\n",
+      "'''):\n",
+      "    display(a)\n",
+      "\n",
+      "a = spot.automaton('''\n",
+      "HOA: v1\n",
+      "States: 3\n",
+      "Start: 0&2\n",
+      "AP: 2 \"a\" \"b\"\n",
+      "Acceptance: 1 Fin(0)\n",
+      "spot.highlight.edges: 2 2\n",
+      "--BODY--\n",
+      "State: 0\n",
+      "[0] 1&2\n",
+      "State: 1\n",
+      "[1] 1&2 {0}\n",
+      "State: 2\n",
+      "[1] 1&2\n",
+      "--END--\n",
+      "''')\n",
+      "display(a, a.show('.basy'))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "display_data",
+       "svg": [
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+        " viewBox=\"0.00 0.00 226.60 178.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
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diff --git a/tests/python/decompose.ipynb b/tests/python/decompose.ipynb
index 9f21cc2e2..68ea84c15 100644
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@@ -4870,7 +4870,7 @@
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        ],
        "text": [
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         "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge7\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
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-        "<g id=\"edge8\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
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@@ -4944,14 +4944,14 @@
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+        "<g id=\"edge8\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
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-        "<g id=\"edge3\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
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@@ -4963,21 +4963,21 @@
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@@ -4987,7 +4987,7 @@
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        ],
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd270264330> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814eab0> >"
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From ae0e84ac9e9a96d3d415f9864235634462588eba Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Fri, 2 Jun 2017 11:23:42 +0200
Subject: [PATCH 03/13] simulation: do not depend on bdd numbers for ordering
 classes

Fixes #262 again.  Reported by Maximilien Colange.

* spot/twaalgos/simulation.cc: Use state numbers to order classes, not
their signatures.  The problem was that even if two simulation of the
same automaton assign the same signature, the BDD identifier used for
that signature might be different, and therefore the ordering obtained
by using BDDs as keys in a map can be different.  A side-effect of
this change is that the order of states in automata produced by
simulation-based reduction may change; many tests had to be updated.
* tests/core/ltl2tgba.test: Add a new test case based on Maximilien's
report.
* tests/core/complement.test, tests/core/det.test,
tests/core/parseaut.test, tests/core/prodor.test,
tests/python/atva16-fig2a.ipynb, tests/python/automata.ipynb,
tests/python/decompose.ipynb, tests/python/highlighting.ipynb,
tests/python/piperead.ipynb, tests/python/testingaut.ipynb,
tests/python/word.ipynb: Update test cases for new order of states.
---
 spot/twaalgos/simulation.cc     |  52 +-
 tests/core/complement.test      |   4 +-
 tests/core/det.test             |  42 +-
 tests/core/ltl2tgba.test        |   8 +
 tests/core/parseaut.test        |  50 +-
 tests/core/prodor.test          |  10 +-
 tests/python/atva16-fig2a.ipynb | 118 ++---
 tests/python/automata.ipynb     | 839 ++++++++++++++++----------------
 tests/python/decompose.ipynb    | 518 ++++++++++----------
 tests/python/highlighting.ipynb | 106 ++--
 tests/python/piperead.ipynb     |  76 ++-
 tests/python/testingaut.ipynb   | 532 ++++++++++----------
 tests/python/word.ipynb         | 224 ++++++---
 13 files changed, 1337 insertions(+), 1242 deletions(-)

diff --git a/spot/twaalgos/simulation.cc b/spot/twaalgos/simulation.cc
index e59ed5e4a..2b4e51786 100644
--- a/spot/twaalgos/simulation.cc
+++ b/spot/twaalgos/simulation.cc
@@ -275,7 +275,7 @@ namespace spot
 
         // We run through the map bdd/list<state>, and we update
         // the previous_class_ with the new data.
-        for (auto& p: bdd_lstate_)
+        for (auto& p: sorted_classes_)
           {
             // If the signature of a state is bddfalse (no
             // edges) the class of this state is bddfalse
@@ -283,11 +283,11 @@ namespace spot
             // simplifications in the signature by removing a
             // edge which has as a destination a state with
             // no outgoing edge.
-            if (p.first == bddfalse)
-              for (auto s: p.second)
+            if (p->first == bddfalse)
+              for (unsigned s: p->second)
                 previous_class_[s] = bddfalse;
             else
-              for (auto s: p.second)
+              for (unsigned s: p->second)
                 previous_class_[s] = *it_bdd;
             ++it_bdd;
           }
@@ -302,10 +302,10 @@ namespace spot
           {
             update_previous_class();
             nb_partition_before = bdd_lstate_.size();
-            bdd_lstate_.clear();
             nb_po_before = po_size_;
             po_size_ = 0;
             update_sig();
+            // print_partition();
             go_to_next_it();
           }
 
@@ -347,8 +347,18 @@ namespace spot
 
       void update_sig()
       {
+        bdd_lstate_.clear();
+        sorted_classes_.clear();
         for (unsigned s = 0; s < size_a_; ++s)
-          bdd_lstate_[compute_sig(s)].emplace_back(s);
+          {
+            bdd sig = compute_sig(s);
+            auto p = bdd_lstate_.emplace(std::piecewise_construct,
+                                         std::make_tuple(sig),
+                                         std::make_tuple());
+            p.first->second.emplace_back(s);
+            if (p.second)
+              sorted_classes_.emplace_back(p.first);
+          }
       }
 
 
@@ -390,7 +400,7 @@ namespace spot
 
         std::list<bdd>::iterator it_bdd = used_var_.begin();
 
-        for (auto& p: bdd_lstate_)
+        for (auto& p: sorted_classes_)
           {
             // If the signature of a state is bddfalse (no edges) the
             // class of this state is bddfalse instead of an anonymous
@@ -398,9 +408,9 @@ namespace spot
             // removing an edge which has as a destination a state
             // with no outgoing edge.
             bdd acc = bddfalse;
-            if (p.first != bddfalse)
+            if (p->first != bddfalse)
               acc = *it_bdd;
-            now_to_next.emplace_back(p.first, acc);
+            now_to_next.emplace_back(p->first, acc);
             ++it_bdd;
           }
 
@@ -446,10 +456,10 @@ namespace spot
 
         if (implications)
           implications->resize(bdd_lstate_.size());
-        // Create one state per partition.
-        for (auto& p: bdd_lstate_)
+        // Create one state per class.
+        for (auto& p: sorted_classes_)
           {
-            bdd cl = previous_class_[p.second.front()];
+            bdd cl = previous_class_[p->second.front()];
             // A state may be referred to either by
             // its class, or by all the implied classes.
             auto s = gb->new_state(cl.id());
@@ -472,14 +482,14 @@ namespace spot
         auto all_inf = all_inf_;
         // For each class, we will create
         // all the edges between the states.
-        for (auto& p: bdd_lstate_)
+        for (auto& p: sorted_classes_)
           {
             // All states in p.second have the same class, so just
             // pick the class of the first one first one.
-            bdd src = previous_class_[p.second.front()];
+            bdd src = previous_class_[p->second.front()];
 
             // Get the signature to derive successors.
-            bdd sig = compute_sig(p.second.front());
+            bdd sig = compute_sig(p->second.front());
 
             if (Cosimulation)
               sig = bdd_compose(sig, bddfalse, bdd_var(bdd_initial));
@@ -613,12 +623,12 @@ namespace spot
       // where is the new class name.
       void print_partition()
       {
-        for (auto& p: bdd_lstate_)
+        for (auto& p: sorted_classes_)
           {
             std::cerr << "partition: "
-                      << bdd_format_isop(a_->get_dict(), p.first)
+                      << bdd_format_isop(a_->get_dict(), p->first)
                       << std::endl;
-            for (auto s: p.second)
+            for (auto s: p->second)
               std::cerr << "  - "
                         << a_->format_state(a_->state_from_number(s))
                         << '\n';
@@ -646,9 +656,13 @@ namespace spot
       // Represent the class of each state at the previous iteration.
       vector_state_bdd previous_class_;
 
-      // The list of state for each class at the current_iteration.
+      // The list of states for each class at the current_iteration.
       // Computed in `update_sig'.
       map_bdd_lstate bdd_lstate_;
+      // The above map, sorted by states number instead of BDD
+      // identifier to avoid non-determinism while iterating over all
+      // states.
+      std::vector<map_bdd_lstate::const_iterator> sorted_classes_;
 
       // The queue of free bdd. They will be used as the identifier
       // for the class.
diff --git a/tests/core/complement.test b/tests/core/complement.test
index 6a1f4c1c2..2ef1566ac 100755
--- a/tests/core/complement.test
+++ b/tests/core/complement.test
@@ -118,11 +118,11 @@ properties: trans-labels explicit-labels trans-acc complete
 properties: deterministic stutter-invariant
 --BODY--
 State: 0
-[0] 1 {1}
 [!0] 0
-State: 1
 [0] 1 {1}
+State: 1
 [!0] 0 {0}
+[0] 1 {1}
 --END--
 EOF
 diff out expected
diff --git a/tests/core/det.test b/tests/core/det.test
index 9d4014ee5..eeb7d3c22 100755
--- a/tests/core/det.test
+++ b/tests/core/det.test
@@ -1,7 +1,7 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2013, 2014, 2015, 2016 Laboratoire de Recherche et
-# Développement de l'Epita (LRDE).
+# Copyright (C) 2013-2017 Laboratoire de Recherche et Développement de
+# l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
 #
@@ -148,20 +148,20 @@ cat >expected-nd.hoa <<EOF
 HOA: v1.1
 name: "XGa R (!a & Fa)"
 States: 2
-Start: 1
+Start: 0
 AP: 1 "a"
 acc-name: Buchi
 Acceptance: 1 Inf(0)
 properties: trans-labels explicit-labels state-acc !complete
 properties: !deterministic
-spot.highlight.states: 1 1
-spot.highlight.edges: 2 2 3 2
+spot.highlight.states: 0 1
+spot.highlight.edges: 1 2 2 2
 --BODY--
-State: 0 {0}
-[0] 0
-State: 1
+State: 0
 [!0] 0
 [!0] 1
+State: 1 {0}
+[0] 1
 --END--
 EOF
 diff expected-nd.hoa out-nd.hoa
@@ -173,19 +173,19 @@ cat >expected-rand.hoa <<EOF
 HOA: v1.1
 name: "XGa R (!a & Fa)"
 States: 2
-Start: 0
+Start: 1
 AP: 1 "a"
 acc-name: Buchi
 Acceptance: 1 Inf(0)
 properties: trans-labels explicit-labels state-acc !complete
 properties: !deterministic
-spot.highlight.states: 0 1
+spot.highlight.states: 1 1
 --BODY--
-State: 0
-[!0] 0
+State: 0 {0}
+[0] 0
+State: 1
 [!0] 1
-State: 1 {0}
-[0] 1
+[!0] 0
 --END--
 EOF
 diff expected-rand.hoa rand.hoa
@@ -197,20 +197,20 @@ cat >expected-rand2.hoa <<EOF
 HOA: v1.1
 name: "XGa R (!a & Fa)"
 States: 2
-Start: 0
+Start: 1
 AP: 1 "a"
 acc-name: Buchi
 Acceptance: 1 Inf(0)
 properties: trans-labels explicit-labels state-acc !complete
 properties: !deterministic
-spot.highlight.states: 0 5
-spot.highlight.edges: 1 5 2 5
+spot.highlight.states: 1 5
+spot.highlight.edges: 2 5 3 5
 --BODY--
-State: 0
-[!0] 0
+State: 0 {0}
+[0] 0
+State: 1
 [!0] 1
-State: 1 {0}
-[0] 1
+[!0] 0
 --END--
 EOF
 diff expected-rand2.hoa rand2.hoa
diff --git a/tests/core/ltl2tgba.test b/tests/core/ltl2tgba.test
index a1c08208d..89b4fba75 100755
--- a/tests/core/ltl2tgba.test
+++ b/tests/core/ltl2tgba.test
@@ -255,3 +255,11 @@ ltl2tgba --low --any 'Xp1 xor (Fp1 M (!p1 M (Fp0 W p1)))' \
 ltl2tgba --low --any 'Xp1 xor (Fp1 M (!p1 M (Fp0 W p1)))' "$s" >res2
 ltl2tgba --low --any 'Fp0 -> XXG(1 U Gp1)' "$s" >>res2
 diff res1 res2
+
+# Another case where different but isomorphic automata
+# were output (issue #262 again).
+f1='F(Gp0 <-> Gp1)'
+f2='Gp1 | FGp0'
+(ltl2tgba -xsimul=1 --low "$f1"; ltl2tgba -xsimul=1 --low "$f2") > res1
+ltl2tgba -xsimul=1 --low "$f1" "$f2" > res2
+diff res1 res2
diff --git a/tests/core/parseaut.test b/tests/core/parseaut.test
index 9c5c64dd9..63b9106e7 100755
--- a/tests/core/parseaut.test
+++ b/tests/core/parseaut.test
@@ -1692,7 +1692,7 @@ cat >expected <<EOF
 HOA: v1
 name: "(c U d) & G(Fa & Fb)"
 States: 3
-Start: 1
+Start: 0
 AP: 4 "c" "d" "a" "b"
 acc-name: generalized-Buchi 2
 Acceptance: 2 Inf(0)&Inf(1)
@@ -1700,39 +1700,39 @@ properties: implicit-labels trans-acc complete deterministic
 properties: stutter-invariant
 --BODY--
 State: 0
+2
 0
+1
+1
+2
 0
+1
+1
+2
 0
+1
+1
+2
 0
-0 {0}
-0 {0}
-0 {0}
-0 {0}
-0 {1}
-0 {1}
-0 {1}
-0 {1}
-0 {0 1}
-0 {0 1}
-0 {0 1}
-0 {0 1}
+1
+1
 State: 1
-2
 1
-0
-0
-2
 1
-0
-0
-2
 1
-0
-0
-2
 1
-0
-0
+1 {0}
+1 {0}
+1 {0}
+1 {0}
+1 {1}
+1 {1}
+1 {1}
+1 {1}
+1 {0 1}
+1 {0 1}
+1 {0 1}
+1 {0 1}
 State: 2
 2
 2
diff --git a/tests/core/prodor.test b/tests/core/prodor.test
index bd8dbec47..35640d6cb 100755
--- a/tests/core/prodor.test
+++ b/tests/core/prodor.test
@@ -1,6 +1,6 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2015 Laboratoire de Recherche et Développement
+# Copyright (C) 2015, 2017 Laboratoire de Recherche et Développement
 # de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
@@ -39,10 +39,10 @@ properties: trans-labels explicit-labels trans-acc complete
 properties: stutter-invariant
 --BODY--
 State: 0
-[0&1] 1 {1}
-[!0&1] 1
 [0] 0 {1}
 [!0] 0
+[0&1] 1 {1}
+[!0&1] 1
 State: 1
 [0&1] 1 {0 1}
 [!0&1] 1 {0}
@@ -70,10 +70,10 @@ Acceptance: 2 Inf(0)&Inf(1)
 properties: trans-labels explicit-labels trans-acc stutter-invariant
 --BODY--
 State: 0
-[0&1] 1 {1}
-[!0&1] 1
 [0] 0 {1}
 [!0] 0
+[0&1] 1 {1}
+[!0&1] 1
 State: 1
 [0&1] 1 {0 1}
 [!0&1] 1 {0}
diff --git a/tests/python/atva16-fig2a.ipynb b/tests/python/atva16-fig2a.ipynb
index 6fa7be833..7f0aaa398 100644
--- a/tests/python/atva16-fig2a.ipynb
+++ b/tests/python/atva16-fig2a.ipynb
@@ -97,85 +97,85 @@
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         "<text text-anchor=\"start\" x=\"137.75\" y=\"-319.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
         "<!-- I -->\n",
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-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-156\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"56\" y=\"-152.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
-        "<!-- I&#45;&gt;1 -->\n",
-        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-156C2.79388,-156 17.1543,-156 30.6317,-156\"/>\n",
-        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-156 30.9419,-159.15 34.4419,-156 30.9419,-156 30.9419,-156 30.9419,-156 34.4419,-156 30.9418,-152.85 37.9419,-156 37.9419,-156\"/>\n",
-        "</g>\n",
-        "<!-- 1&#45;&gt;1 -->\n",
-        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-173.037C48.3189,-182.858 50.4453,-192 56,-192 60.166,-192 62.4036,-186.858 62.7128,-180.143\"/>\n",
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-        "<text text-anchor=\"middle\" x=\"56\" y=\"-195.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
-        "</g>\n",
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-        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"169\" cy=\"-247\" rx=\"18\" ry=\"18\"/>\n",
-        "<text text-anchor=\"middle\" x=\"169\" y=\"-243.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-75\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-71.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g id=\"edge3\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
-        "<path fill=\"none\" stroke=\"black\" d=\"M70.6108,-167.158C90.2734,-183.278 126.706,-213.147 149.007,-231.429\"/>\n",
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-        "<text text-anchor=\"start\" x=\"92\" y=\"-220.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-75C2.79388,-75 17.1543,-75 30.6317,-75\"/>\n",
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+        "</g>\n",
+        "<!-- 0&#45;&gt;0 -->\n",
+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-92.0373C48.3189,-101.858 50.4453,-111 56,-111 60.166,-111 62.4036,-105.858 62.7128,-99.1433\"/>\n",
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+        "<text text-anchor=\"start\" x=\"51.5\" y=\"-114.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"169\" cy=\"-118\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"start\" x=\"164.5\" y=\"-114.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "</g>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M73.3784,-81.3448C92.4242,-88.7229 123.976,-100.946 145.359,-109.229\"/>\n",
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+        "<text text-anchor=\"start\" x=\"99\" y=\"-107.8\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
         "</g>\n",
         "<!-- 2 -->\n",
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         "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"169\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
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         "</g>\n",
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-        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;2</title>\n",
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-        "<text text-anchor=\"start\" x=\"99\" y=\"-114.8\" font-family=\"Lato\" font-size=\"14.00\">a | b</text>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M72.4341,-67.0744C91.6528,-57.2053 124.596,-40.2883 146.337,-29.1242\"/>\n",
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+        "<text text-anchor=\"start\" x=\"92\" y=\"-59.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
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-        "<text text-anchor=\"start\" x=\"169\" y=\"-286.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#f17cb0\">\u2776</text>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M166.467,-136.153C166.078,-145.539 166.922,-154 169,-154 170.526,-154 171.387,-149.437 171.582,-143.295\"/>\n",
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+        "<text text-anchor=\"start\" x=\"150.5\" y=\"-172.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; b</text>\n",
+        "<text text-anchor=\"start\" x=\"161\" y=\"-157.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#f17cb0\">\u2776</text>\n",
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+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M165.104,-135.577C162.424,-156.718 163.723,-184 169,-184 173.7,-184 175.244,-162.36 173.633,-142.691\"/>\n",
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+        "<text text-anchor=\"start\" x=\"148.5\" y=\"-187.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
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-        "<g id=\"edge7\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
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-        "<text text-anchor=\"start\" x=\"148.5\" y=\"-87.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge7\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M164.049,-135.467C158.901,-163.149 160.551,-202 169,-202 176.756,-202 178.783,-169.261 175.081,-142.477\"/>\n",
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diff --git a/tests/python/automata.ipynb b/tests/python/automata.ipynb
index dec25e75f..1c8ceacbf 100644
--- a/tests/python/automata.ipynb
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@@ -2735,7 +2734,7 @@
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@@ -2805,7 +2804,7 @@
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@@ -2877,7 +2876,7 @@
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        ],
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-        "<IPython.core.display.SVG at 0x7fe33408fa58>"
+        "<IPython.core.display.SVG object>"
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@@ -2930,7 +2929,7 @@
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-        "<IPython.core.display.SVG at 0x7fe3340b0828>"
+        "<IPython.core.display.SVG object>"
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@@ -3042,7 +3041,7 @@
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@@ -3154,7 +3153,7 @@
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-        "<IPython.core.display.SVG at 0x7fe3340a9cf8>"
+        "<IPython.core.display.SVG object>"
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@@ -3169,7 +3168,7 @@
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-     "collapsed": true,
+     "collapsed": false,
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@@ -3232,7 +3231,7 @@
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@@ -3315,7 +3314,7 @@
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@@ -3400,7 +3399,7 @@
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@@ -3410,7 +3409,7 @@
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-      "Adding an automatic proposition to all edges"
+      "Adding an atomic proposition to all edges"
      ]
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@@ -3489,7 +3488,7 @@
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        ],
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+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb9182344b0> >"
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@@ -3578,7 +3577,7 @@
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe33c747540> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb9182344b0> >"
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@@ -3588,4 +3587,4 @@
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+}
diff --git a/tests/python/decompose.ipynb b/tests/python/decompose.ipynb
index 68ea84c15..0518248d4 100644
--- a/tests/python/decompose.ipynb
+++ b/tests/python/decompose.ipynb
@@ -80,138 +80,138 @@
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+        "<!-- 3&#45;&gt;0 -->\n",
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+        "<!-- 3&#45;&gt;1 -->\n",
+        "<g id=\"edge9\" class=\"edge\"><title>3&#45;&gt;1</title>\n",
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-        "<text text-anchor=\"start\" x=\"226\" y=\"-119.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; c</text>\n",
+        "<!-- 3&#45;&gt;4 -->\n",
+        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M208.303,-174C224.962,-174 250.303,-174 268.927,-174\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"275.953,-174 268.953,-177.15 272.453,-174 268.953,-174 268.953,-174 268.953,-174 272.453,-174 268.953,-170.85 275.953,-174 275.953,-174\"/>\n",
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-        "<text text-anchor=\"start\" x=\"172\" y=\"-185.043\" font-family=\"Lato\" font-size=\"14.00\">a &amp; !c</text>\n",
+        "<!-- 3&#45;&gt;3 -->\n",
+        "<g id=\"edge10\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
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        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0e70> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9540> >"
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      ],
@@ -1424,7 +1424,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b04b0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777360> >"
        ]
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      ],
@@ -1749,7 +1749,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e420> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777450> >"
        ]
       },
       {
@@ -1946,7 +1946,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0540> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d95d0> >"
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       {
@@ -2126,7 +2126,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0360> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9e40> >"
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@@ -2461,7 +2461,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b03c0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a30923420> >"
        ]
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@@ -2605,7 +2605,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e4b0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7774e0> >"
        ]
       },
       {
@@ -2724,7 +2724,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16823e5a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9e70> >"
        ]
       },
       {
@@ -2904,7 +2904,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0ea0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2d0686f0> >"
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@@ -3261,7 +3261,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e420> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7774e0> >"
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      ],
@@ -3551,7 +3551,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e4b0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7773f0> >"
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       {
@@ -3703,7 +3703,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0e40> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9e40> >"
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       {
@@ -3840,7 +3840,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b05a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d93f0> >"
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@@ -4143,7 +4143,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e450> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777510> >"
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@@ -4254,7 +4254,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e660> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777750> >"
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      ],
@@ -4346,7 +4346,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e5d0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777870> >"
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       },
       {
@@ -4412,7 +4412,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16823e5a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9ea0> >"
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      ],
@@ -4498,7 +4498,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e540> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777930> >"
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@@ -4653,7 +4653,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814e990> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777990> >"
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@@ -4782,7 +4782,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814ea50> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777420> >"
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       {
@@ -4870,7 +4870,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa1681b0e70> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c7d9540> >"
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       {
@@ -4987,7 +4987,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa16814eab0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f3a2c777a50> >"
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      ],
diff --git a/tests/python/highlighting.ipynb b/tests/python/highlighting.ipynb
index 04b9c5699..8b7c41e57 100644
--- a/tests/python/highlighting.ipynb
+++ b/tests/python/highlighting.ipynb
@@ -15,7 +15,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.3rc1"
+   "version": "3.5.3"
   },
   "name": ""
  },
@@ -254,7 +254,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0b5ab70> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b673b870> >"
        ]
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@@ -356,7 +356,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.twa; proxy of <Swig Object of type 'std::shared_ptr< spot::twa > *' at 0x7fd9b0aeb270> >"
+        "<spot.twa; proxy of <Swig Object of type 'std::shared_ptr< spot::twa > *' at 0x7f98b66ad630> >"
        ]
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@@ -571,7 +571,7 @@
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        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb390> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad300> >"
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@@ -750,7 +750,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb390> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad300> >"
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@@ -830,7 +830,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb660> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad7b0> >"
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@@ -876,7 +876,7 @@
         "</svg>\n"
        ],
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-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb300> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad570> >"
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@@ -962,7 +962,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb150> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad750> >"
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@@ -1087,7 +1087,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb150> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad750> >"
        ]
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       {
@@ -1144,7 +1144,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb660> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad7b0> >"
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@@ -1190,7 +1190,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb300> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad570> >"
        ]
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      ],
@@ -1397,7 +1397,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_product; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_product > *' at 0x7fd9b0aeb750> >"
+        "<spot.impl.twa_product; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_product > *' at 0x7f98b66ad510> >"
        ]
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       {
@@ -1471,7 +1471,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb630> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adb70> >"
        ]
       },
       {
@@ -1555,7 +1555,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb2d0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66ad3c0> >"
        ]
       }
      ],
@@ -1701,7 +1701,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb810> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adcc0> >"
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       }
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@@ -1846,7 +1846,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb810> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adcc0> >"
        ]
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      ],
@@ -1989,7 +1989,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd9b0aeb810> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f98b66adcc0> >"
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@@ -2202,51 +2202,51 @@
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-        "<!-- 1 -->\n",
-        "<g class=\"node\" id=\"node2\"><title>1</title>\n",
+        "<!-- 0 -->\n",
+        "<g class=\"node\" id=\"node2\"><title>0</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"56\" y=\"-66.3\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"56\" y=\"-66.3\">0</text>\n",
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-        "<!-- I&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge1\"><title>I-&gt;1</title>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g class=\"edge\" id=\"edge1\"><title>I-&gt;0</title>\n",
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-        "<!-- 0 -->\n",
-        "<g class=\"node\" id=\"node3\"><title>0</title>\n",
+        "<!-- 1 -->\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"165\" y=\"-168.3\">0</text>\n",
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-        "<!-- 1&#45;&gt;0 -->\n",
-        "<g class=\"edge\" id=\"edge3\"><title>1-&gt;0</title>\n",
+        "<!-- 0&#45;&gt;1 -->\n",
+        "<g class=\"edge\" id=\"edge2\"><title>0-&gt;1</title>\n",
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-        "<!-- 2 -->\n",
-        "<g class=\"node\" id=\"node7\"><title>2</title>\n",
+        "<!-- 3 -->\n",
+        "<g class=\"node\" id=\"node7\"><title>3</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"417\" y=\"-30.3\">2</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"417\" y=\"-30.3\">3</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge4\"><title>1-&gt;2</title>\n",
+        "<!-- 0&#45;&gt;3 -->\n",
+        "<g class=\"edge\" id=\"edge4\"><title>0-&gt;3</title>\n",
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         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"211.5\" y=\"-20.8\">!a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 3 -->\n",
-        "<g class=\"node\" id=\"node8\"><title>3</title>\n",
+        "<!-- 2 -->\n",
+        "<g class=\"node\" id=\"node8\"><title>2</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"165\" y=\"-66.3\">3</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"165\" y=\"-66.3\">2</text>\n",
         "</g>\n",
-        "<!-- 1&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge5\"><title>1-&gt;3</title>\n",
+        "<!-- 0&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;2</title>\n",
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         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"92\" y=\"-73.8\">!a &amp; b</text>\n",
         "</g>\n",
-        "<!-- 0&#45;&gt;0 -->\n",
-        "<g class=\"edge\" id=\"edge2\"><title>0-&gt;0</title>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g class=\"edge\" id=\"edge5\"><title>1-&gt;1</title>\n",
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@@ -2317,26 +2317,26 @@
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         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"678.5\" y=\"-148.8\">!b &amp; c</text>\n",
         "</g>\n",
-        "<!-- 2&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge6\"><title>2-&gt;4</title>\n",
+        "<!-- 3&#45;&gt;4 -->\n",
+        "<g class=\"edge\" id=\"edge10\"><title>3-&gt;4</title>\n",
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         "</g>\n",
-        "<!-- 3&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge9\"><title>3-&gt;4</title>\n",
+        "<!-- 2&#45;&gt;4 -->\n",
+        "<g class=\"edge\" id=\"edge8\"><title>2-&gt;4</title>\n",
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         "</g>\n",
-        "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;2</title>\n",
+        "<!-- 2&#45;&gt;3 -->\n",
+        "<g class=\"edge\" id=\"edge7\"><title>2-&gt;3</title>\n",
         "<path d=\"M181.764,-62.7925C187.692,-60.3237 194.557,-57.7464 201,-56 268.503,-37.7027 351.689,-34.3871 391.933,-33.9368\" fill=\"none\" stroke=\"black\"/>\n",
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         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"281\" y=\"-44.8\">!a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 3&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;3</title>\n",
+        "<!-- 2&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge6\"><title>2-&gt;2</title>\n",
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@@ -2346,8 +2346,8 @@
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         "</g>\n",
-        "<!-- 3&#45;&gt;5 -->\n",
-        "<g class=\"edge\" id=\"edge10\"><title>3-&gt;5</title>\n",
+        "<!-- 2&#45;&gt;5 -->\n",
+        "<g class=\"edge\" id=\"edge9\"><title>2-&gt;5</title>\n",
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         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"201\" y=\"-66.8\">!a &amp; b &amp; c</text>\n",
@@ -2358,14 +2358,14 @@
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         "</g>\n",
-        "<!-- 5&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge13\"><title>5-&gt;2</title>\n",
+        "<!-- 5&#45;&gt;3 -->\n",
+        "<g class=\"edge\" id=\"edge14\"><title>5-&gt;3</title>\n",
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         "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"340\" y=\"-66.8\">!a &amp; !b</text>\n",
         "</g>\n",
-        "<!-- 5&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge14\"><title>5-&gt;3</title>\n",
+        "<!-- 5&#45;&gt;2 -->\n",
+        "<g class=\"edge\" id=\"edge13\"><title>5-&gt;2</title>\n",
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diff --git a/tests/python/piperead.ipynb b/tests/python/piperead.ipynb
index 4f9392704..874c75352 100644
--- a/tests/python/piperead.ipynb
+++ b/tests/python/piperead.ipynb
@@ -15,10 +15,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.4.3+"
+   "version": "3.5.3"
   },
-  "name": "",
-  "signature": "sha256:8de782e4035d4a93101b749825f0975f5f8cee034332d048014ba13dfa232983"
+  "name": ""
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -111,7 +110,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f330> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb6866420> >"
        ]
       },
       {
@@ -162,7 +161,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f4e0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb47205d0> >"
        ]
       },
       {
@@ -208,7 +207,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f270> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb4720360> >"
        ]
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         "<!-- I -->\n",
-        "<!-- 1 -->\n",
-        "<g id=\"node2\" class=\"node\"><title>1</title>\n",
+        "<!-- 0 -->\n",
+        "<g id=\"node2\" class=\"node\"><title>0</title>\n",
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-        "<text text-anchor=\"middle\" x=\"56\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
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-        "<!-- I&#45;&gt;1 -->\n",
-        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;1</title>\n",
+        "<!-- I&#45;&gt;0 -->\n",
+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
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-        "<!-- 0 -->\n",
-        "<g id=\"node3\" class=\"node\"><title>0</title>\n",
+        "<!-- 1 -->\n",
+        "<g id=\"node3\" class=\"node\"><title>1</title>\n",
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-        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;0</title>\n",
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-        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<!-- 1&#45;&gt;1 -->\n",
+        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
         "<path fill=\"none\" stroke=\"black\" d=\"M129.769,-35.249C126.057,-56.4346 127.801,-84 135,-84 141.412,-84 143.496,-62.1347 141.253,-42.3851\"/>\n",
         "<polygon fill=\"black\" stroke=\"black\" points=\"140.231,-35.249 144.342,-41.7316 140.727,-38.7137 141.223,-42.1783 141.223,-42.1783 141.223,-42.1783 140.727,-38.7137 138.105,-42.625 140.231,-35.249 140.231,-35.249\"/>\n",
         "<text text-anchor=\"start\" x=\"128.5\" y=\"-87.8\" font-family=\"Lato\" font-size=\"14.00\">!b</text>\n",
@@ -265,7 +264,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f330> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb47203f0> >"
        ]
       }
      ],
@@ -342,7 +341,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f4e0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb4720660> >"
        ]
       }
      ],
@@ -371,10 +370,11 @@
        "evalue": "Command 'non-existing-command' returned non-zero exit status 127",
        "output_type": "pyerr",
        "traceback": [
-        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mCalledProcessError\u001b[0m                        Traceback (most recent call last)",
+        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+        "\u001b[0;31mCalledProcessError\u001b[0m                        Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-4-765c7cc6937f>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mspot\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mautomaton\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'non-existing-command|'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-        "\u001b[0;32m/home/adl/git/spot/python/spot.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    457\u001b[0m     See `spot.automata` for a list of supported formats.\"\"\"\n\u001b[1;32m    458\u001b[0m     \u001b[0;32mtry\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 459\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    460\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    461\u001b[0m         \u001b[0;32mraise\u001b[0m \u001b[0mRuntimeError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Failed to read automaton from {}\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mformat\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-        "\u001b[0;32m/home/adl/git/spot/python/spot.py\u001b[0m in \u001b[0;36mautomata\u001b[0;34m(timeout, ignore_abort, trust_hoa, debug, *sources)\u001b[0m\n\u001b[1;32m    442\u001b[0m                 \u001b[0;32mdel\u001b[0m \u001b[0mproc\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    443\u001b[0m                 \u001b[0;32mif\u001b[0m \u001b[0mret\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 444\u001b[0;31m                     \u001b[0;32mraise\u001b[0m \u001b[0msubprocess\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mCalledProcessError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mret\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mfilename\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    445\u001b[0m     \u001b[0;31m# deleting o explicitely now prevents Python 3.5 from\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    446\u001b[0m     \u001b[0;31m# reporting the following error: \"<built-in function\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    463\u001b[0m     See `spot.automata` for a list of supported formats.\"\"\"\n\u001b[1;32m    464\u001b[0m     \u001b[0;32mtry\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 465\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    466\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    467\u001b[0m         \u001b[0;32mraise\u001b[0m \u001b[0mRuntimeError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Failed to read automaton from {}\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mformat\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomata\u001b[0;34m(timeout, ignore_abort, trust_hoa, no_sid, debug, *sources)\u001b[0m\n\u001b[1;32m    448\u001b[0m                 \u001b[0;32mdel\u001b[0m \u001b[0mproc\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    449\u001b[0m                 \u001b[0;32mif\u001b[0m \u001b[0mret\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 450\u001b[0;31m                     \u001b[0;32mraise\u001b[0m \u001b[0msubprocess\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mCalledProcessError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mret\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mfilename\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    451\u001b[0m     \u001b[0;31m# deleting o explicitely now prevents Python 3.5 from\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    452\u001b[0m     \u001b[0;31m# reporting the following error: \"<built-in function\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
         "\u001b[0;31mCalledProcessError\u001b[0m: Command 'non-existing-command' returned non-zero exit status 127"
        ]
       }
@@ -445,7 +445,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fad7cc5f780> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f2bb4720570> >"
        ]
       },
       {
@@ -453,9 +453,10 @@
        "evalue": "Command 'ltl2tgba \"syntax U U error\"' returned non-zero exit status 2",
        "output_type": "pyerr",
        "traceback": [
-        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mCalledProcessError\u001b[0m                        Traceback (most recent call last)",
+        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+        "\u001b[0;31mCalledProcessError\u001b[0m                        Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-5-1163f8abbaad>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;32mfor\u001b[0m \u001b[0ma\u001b[0m \u001b[0;32min\u001b[0m \u001b[0mspot\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"ltl2tgba 'a U b'|\"\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m'ltl2tgba \"syntax U U error\"|'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      2\u001b[0m     \u001b[0mdisplay\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0ma\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-        "\u001b[0;32m/home/adl/git/spot/python/spot.py\u001b[0m in \u001b[0;36mautomata\u001b[0;34m(timeout, ignore_abort, trust_hoa, debug, *sources)\u001b[0m\n\u001b[1;32m    442\u001b[0m                 \u001b[0;32mdel\u001b[0m \u001b[0mproc\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    443\u001b[0m                 \u001b[0;32mif\u001b[0m \u001b[0mret\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 444\u001b[0;31m                     \u001b[0;32mraise\u001b[0m \u001b[0msubprocess\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mCalledProcessError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mret\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mfilename\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    445\u001b[0m     \u001b[0;31m# deleting o explicitely now prevents Python 3.5 from\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    446\u001b[0m     \u001b[0;31m# reporting the following error: \"<built-in function\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomata\u001b[0;34m(timeout, ignore_abort, trust_hoa, no_sid, debug, *sources)\u001b[0m\n\u001b[1;32m    448\u001b[0m                 \u001b[0;32mdel\u001b[0m \u001b[0mproc\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    449\u001b[0m                 \u001b[0;32mif\u001b[0m \u001b[0mret\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 450\u001b[0;31m                     \u001b[0;32mraise\u001b[0m \u001b[0msubprocess\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mCalledProcessError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mret\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mfilename\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    451\u001b[0m     \u001b[0;31m# deleting o explicitely now prevents Python 3.5 from\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    452\u001b[0m     \u001b[0;31m# reporting the following error: \"<built-in function\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
         "\u001b[0;31mCalledProcessError\u001b[0m: Command 'ltl2tgba \"syntax U U error\"' returned non-zero exit status 2"
        ]
       }
@@ -483,25 +484,22 @@
        "evalue": "Failed to read automaton from true|",
        "output_type": "pyerr",
        "traceback": [
-        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mRuntimeError\u001b[0m                              Traceback (most recent call last)",
+        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+        "\u001b[0;31mStopIteration\u001b[0m                             Traceback (most recent call last)",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    464\u001b[0m     \u001b[0;32mtry\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 465\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    466\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;31mStopIteration\u001b[0m: ",
+        "\nDuring handling of the above exception, another exception occurred:\n",
+        "\u001b[0;31mRuntimeError\u001b[0m                              Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-6-f4e056a50029>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mspot\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mautomaton\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'true|'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-        "\u001b[0;32m/home/adl/git/spot/python/spot.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    459\u001b[0m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    460\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 461\u001b[0;31m         \u001b[0;32mraise\u001b[0m \u001b[0mRuntimeError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Failed to read automaton from {}\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mformat\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    462\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    463\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/__init__.py\u001b[0m in \u001b[0;36mautomaton\u001b[0;34m(filename, **kwargs)\u001b[0m\n\u001b[1;32m    465\u001b[0m         \u001b[0;32mreturn\u001b[0m \u001b[0mnext\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mautomata\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    466\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mStopIteration\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 467\u001b[0;31m         \u001b[0;32mraise\u001b[0m \u001b[0mRuntimeError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Failed to read automaton from {}\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mformat\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfilename\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    468\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    469\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
         "\u001b[0;31mRuntimeError\u001b[0m: Failed to read automaton from true|"
        ]
       }
      ],
      "prompt_number": 6
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [],
-     "language": "python",
-     "metadata": {},
-     "outputs": []
     }
    ],
    "metadata": {}
   }
  ]
-}
\ No newline at end of file
+}
diff --git a/tests/python/testingaut.ipynb b/tests/python/testingaut.ipynb
index 9d7f44e85..1185ceb52 100644
--- a/tests/python/testingaut.ipynb
+++ b/tests/python/testingaut.ipynb
@@ -1,7 +1,23 @@
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-  "signature": "sha256:1a85b698ebae51aaba0387d782d1cf5c6cdf54f69dd6b4b9c7189f8676eb4c88"
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
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+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.5.3"
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+        "<path d=\"M574.289,-183.867C594.558,-177.095 620.635,-168.382 642.349,-161.127\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"649.233,-158.827 643.592,-164.033 645.914,-159.936 642.594,-161.045 642.594,-161.045 642.594,-161.045 645.914,-159.936 641.596,-158.057 649.233,-158.827 649.233,-158.827\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"613.274\" y=\"-179.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 6 -->\n",
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-        "<ellipse cx=\"774.857\" cy=\"-158\" fill=\"none\" rx=\"41.4533\" ry=\"41.4533\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"774.857\" y=\"-161.8\">0</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"774.857\" y=\"-146.8\">!a &amp; b</text>\n",
+        "<ellipse cx=\"832.462\" cy=\"-148\" fill=\"#ffffaa\" rx=\"37.4556\" ry=\"26.7574\" stroke=\"black\"/>\n",
+        "<ellipse cx=\"832.462\" cy=\"-148\" fill=\"none\" rx=\"41.4533\" ry=\"30.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"832.462\" y=\"-151.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"832.462\" y=\"-136.8\">!a &amp; b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;6 -->\n",
         "<g class=\"edge\" id=\"edge6\"><title>2-&gt;6</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"628.025\" y=\"-248.8\">{}</text>\n",
+        "<path d=\"M573.227,-207.569C610.507,-220.235 673.351,-235.819 724.985,-220 753.069,-211.396 780.422,-192.606 800.371,-176.378\" fill=\"none\" stroke=\"black\"/>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"685.63\" y=\"-230.8\">{}</text>\n",
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         "<!-- 7 -->\n",
         "<g class=\"node\" id=\"node8\"><title>7</title>\n",
-        "<ellipse cx=\"926.639\" cy=\"-61\" fill=\"#ffffaa\" rx=\"37.4556\" ry=\"37.4556\" stroke=\"black\"/>\n",
-        "<ellipse cx=\"926.639\" cy=\"-61\" fill=\"none\" rx=\"41.4533\" ry=\"41.4533\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"926.639\" y=\"-64.8\">0</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"926.639\" y=\"-49.8\">a &amp; !b</text>\n",
+        "<ellipse cx=\"984.243\" cy=\"-61\" fill=\"#ffffaa\" rx=\"37.4556\" ry=\"26.7574\" stroke=\"black\"/>\n",
+        "<ellipse cx=\"984.243\" cy=\"-61\" fill=\"none\" rx=\"41.4533\" ry=\"30.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"984.243\" y=\"-64.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"984.243\" y=\"-49.8\">a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;7 -->\n",
         "<g class=\"edge\" id=\"edge7\"><title>2-&gt;7</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"700.38\" y=\"-80.8\">{a, b}</text>\n",
+        "<path d=\"M561.908,-172.669C581.815,-152.7 613.507,-124.033 646.274,-107 740.039,-58.2596 867.402,-55.1871 935.553,-57.7503\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"942.762,-58.051 935.637,-60.9064 939.265,-57.9051 935.768,-57.7592 935.768,-57.7592 935.768,-57.7592 939.265,-57.9051 935.9,-54.6119 942.762,-58.051 942.762,-58.051\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"757.985\" y=\"-76.8\">{a, b}</text>\n",
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         "<!-- 8 -->\n",
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-        "<ellipse cx=\"926.639\" cy=\"-289\" fill=\"#ffffaa\" rx=\"40.1285\" ry=\"40.1285\" stroke=\"black\"/>\n",
-        "<ellipse cx=\"926.639\" cy=\"-289\" fill=\"none\" rx=\"44.111\" ry=\"44.111\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"926.639\" y=\"-292.8\">0</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"926.639\" y=\"-277.8\">!a &amp; !b</text>\n",
+        "<ellipse cx=\"984.243\" cy=\"-269\" fill=\"#ffffaa\" rx=\"40.1285\" ry=\"26.7574\" stroke=\"black\"/>\n",
+        "<ellipse cx=\"984.243\" cy=\"-269\" fill=\"none\" rx=\"44.111\" ry=\"30.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"984.243\" y=\"-272.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"984.243\" y=\"-257.8\">!a &amp; !b</text>\n",
         "</g>\n",
         "<!-- 2&#45;&gt;8 -->\n",
         "<g class=\"edge\" id=\"edge8\"><title>2-&gt;8</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"700.38\" y=\"-292.8\">{b}</text>\n",
+        "<path d=\"M566.189,-214.259C575.831,-220.927 587.181,-227.979 598.274,-233 618.41,-242.113 624.663,-241.37 646.274,-246 709.952,-259.643 726.118,-263.23 790.985,-269 835.685,-272.976 847.063,-270.556 891.938,-271 905.271,-271.132 908.607,-271.217 921.938,-271 925.442,-270.943 929.058,-270.867 932.699,-270.779\" fill=\"none\" stroke=\"black\"/>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"757.985\" y=\"-271.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge14\"><title>3-&gt;2</title>\n",
-        "<path d=\"M227.758,-145.527C264.685,-139.647 325.2,-133.376 376.06,-144 399.22,-148.838 423.521,-159.065 442.935,-168.65\" fill=\"none\" stroke=\"black\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"338.583\" y=\"-147.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge10\"><title>3-&gt;2</title>\n",
+        "<path d=\"M284.427,-146.736C321.317,-139.886 382.531,-132.27 433.664,-144 458.854,-149.779 485.017,-162.411 504.962,-173.657\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"511.211,-177.249 503.572,-176.491 508.176,-175.504 505.142,-173.76 505.142,-173.76 505.142,-173.76 508.176,-175.504 506.712,-171.029 511.211,-177.249 511.211,-177.249\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"396.187\" y=\"-147.8\">{a}</text>\n",
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         "<!-- 3&#45;&gt;3 -->\n",
-        "<g class=\"edge\" id=\"edge13\"><title>3-&gt;3</title>\n",
-        "<path d=\"M179.627,-185.086C179.558,-196.323 183.933,-205.355 192.751,-205.355 199.64,-205.355 203.817,-199.843 205.282,-192.073\" fill=\"none\" stroke=\"black\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"192.751\" y=\"-209.155\">{}</text>\n",
+        "<g class=\"edge\" id=\"edge9\"><title>3-&gt;3</title>\n",
+        "<path d=\"M237.346,-179.37C236.448,-189.924 240.785,-198.87 250.355,-198.87 257.683,-198.87 261.942,-193.626 263.133,-186.431\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"263.365,-179.37 266.284,-186.47 263.25,-182.868 263.135,-186.366 263.135,-186.366 263.135,-186.366 263.25,-182.868 259.987,-186.263 263.365,-179.37 263.365,-179.37\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"250.355\" y=\"-202.67\">{}</text>\n",
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         "<!-- 3&#45;&gt;4 -->\n",
-        "<g class=\"edge\" id=\"edge15\"><title>3-&gt;4</title>\n",
-        "<path d=\"M222.222,-171.683C229.739,-176.234 238.017,-180.702 246.106,-184 261.284,-190.188 278.659,-194.756 294.16,-198.021\" fill=\"none\" stroke=\"black\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"264.606\" y=\"-199.8\">{b}</text>\n",
+        "<g class=\"edge\" id=\"edge11\"><title>3-&gt;4</title>\n",
+        "<path d=\"M277.29,-171.585C285.43,-176.344 294.662,-181.001 303.711,-184 318.716,-188.973 335.769,-191.746 351.052,-193.276\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"358.396,-193.931 351.144,-196.446 354.91,-193.62 351.424,-193.309 351.424,-193.309 351.424,-193.309 354.91,-193.62 351.704,-190.171 358.396,-193.931 358.396,-193.931\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"322.211\" y=\"-196.8\">{b}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;5 -->\n",
-        "<g class=\"edge\" id=\"edge9\"><title>3-&gt;5</title>\n",
-        "<path d=\"M226.397,-140.622C232.858,-138.77 239.641,-137.1 246.106,-136 366.378,-115.533 510.752,-135.902 582.298,-148.943\" fill=\"none\" stroke=\"black\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"409.06\" y=\"-133.8\">{}</text>\n",
+        "<g class=\"edge\" id=\"edge13\"><title>3-&gt;5</title>\n",
+        "<path d=\"M281.956,-141.797C288.997,-139.463 296.529,-137.335 303.711,-136 327.76,-131.531 334.264,-134.839 358.711,-134 400.02,-132.582 410.335,-131.667 451.664,-131 464.996,-130.785 468.341,-130.476 481.664,-131 535.973,-133.137 598.267,-138.48 639.36,-142.406\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"646.526,-143.096 639.256,-145.56 643.042,-142.761 639.559,-142.425 639.559,-142.425 639.559,-142.425 643.042,-142.761 639.861,-139.289 646.526,-143.096 646.526,-143.096\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"466.664\" y=\"-134.8\">{}</text>\n",
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         "<!-- 3&#45;&gt;6 -->\n",
-        "<g class=\"edge\" id=\"edge10\"><title>3-&gt;6</title>\n",
-        "<path d=\"M224.377,-135.817C231.353,-132.741 238.851,-129.896 246.106,-128 427.419,-80.611 484.163,-70.6112 667.38,-110 689.822,-114.825 713.237,-124.768 732.376,-134.36\" fill=\"none\" stroke=\"black\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"482.365\" y=\"-91.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge14\"><title>3-&gt;6</title>\n",
+        "<path d=\"M279.776,-138.836C287.362,-135.387 295.687,-132.119 303.711,-130 485.008,-82.1242 540.631,-72.7326 724.985,-107 747.556,-111.196 771.514,-119.996 790.976,-128.371\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"797.396,-131.188 789.72,-131.26 794.191,-129.782 790.986,-128.375 790.986,-128.375 790.986,-128.375 794.191,-129.782 792.252,-125.491 797.396,-131.188 797.396,-131.188\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"539.969\" y=\"-92.8\">{a}</text>\n",
         "</g>\n",
         "<!-- 3&#45;&gt;7 -->\n",
-        "<g class=\"edge\" id=\"edge11\"><title>3-&gt;7</title>\n",
-        "<path d=\"M207.136,-119.392C227.894,-74.7296 272.369,-0 337.583,-0 337.583,-0 337.583,-0 775.857,-0 815.143,-0 856.228,-18.222 885.41,-34.7474\" fill=\"none\" stroke=\"black\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"555.67\" y=\"-3.8\">{b}</text>\n",
+        "<g class=\"edge\" id=\"edge15\"><title>3-&gt;7</title>\n",
+        "<path d=\"M261.396,-128.224C280.358,-84.3838 325.861,-0 395.187,-0 395.187,-0 395.187,-0 833.462,-0 874.485,-0 917.471,-19.8698 946.816,-36.9288\" fill=\"none\" stroke=\"black\"/>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"613.274\" y=\"-3.8\">{b}</text>\n",
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         "<!-- 3&#45;&gt;8 -->\n",
-        "<g class=\"edge\" id=\"edge12\"><title>3-&gt;8</title>\n",
-        "<path d=\"M209.097,-183.411C215.207,-196.222 222.181,-211.233 228.106,-225 257.834,-294.071 262.386,-354 337.583,-354 337.583,-354 337.583,-354 775.857,-354 814.76,-354 854.998,-335.32 883.959,-317.988\" fill=\"none\" stroke=\"black\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"555.67\" y=\"-357.8\">{a, b}</text>\n",
+        "<g class=\"edge\" id=\"edge16\"><title>3-&gt;8</title>\n",
+        "<path d=\"M264.11,-178.915C278.761,-207.451 301.126,-250.719 303.711,-254 337.135,-296.426 341.177,-334 395.187,-334 395.187,-334 395.187,-334 833.462,-334 874.746,-334 917.534,-312.962 946.753,-294.824\" fill=\"none\" stroke=\"black\"/>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"613.274\" y=\"-337.8\">{a, b}</text>\n",
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         "<!-- 9 -->\n",
         "<g class=\"node\" id=\"node10\"><title>9</title>\n",
-        "<ellipse cx=\"482.365\" cy=\"-286\" fill=\"#ffffaa\" rx=\"40.1111\" ry=\"40.1111\" stroke=\"black\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"482.365\" y=\"-289.8\">1</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"482.365\" y=\"-274.8\">!a &amp; !b</text>\n",
+        "<ellipse cx=\"539.969\" cy=\"-273\" fill=\"#ffffaa\" rx=\"40.1111\" ry=\"26.7407\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"539.969\" y=\"-276.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"539.969\" y=\"-261.8\">!a &amp; !b</text>\n",
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         "<!-- 3&#45;&gt;9 -->\n",
-        "<g class=\"edge\" id=\"edge16\"><title>3-&gt;9</title>\n",
-        "<path d=\"M208.952,-183.615C226.27,-215.577 257.875,-263.141 301.106,-284 343.123,-304.273 397.325,-301.615 435.276,-295.857\" fill=\"none\" stroke=\"black\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"338.583\" y=\"-302.8\">{a, b}</text>\n",
+        "<g class=\"edge\" id=\"edge12\"><title>3-&gt;9</title>\n",
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        "text": [
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"184.396\" y=\"-56.8\">a &amp; b</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"242\" y=\"-63.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"242\" y=\"-48.8\">a &amp; b</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"122.396\" y=\"-71.8\">a &amp; b</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"180\" y=\"-63.8\">a &amp; b</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"321.872\" y=\"-53.8\">a &amp; !b</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"379.477\" y=\"-58.8\">0</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"379.477\" y=\"-43.8\">a &amp; !b</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"184.396\" y=\"-28.8\">a &amp; !b</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"242\" y=\"-20.8\">a &amp; !b</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"562.349\" y=\"-92.8\">a &amp; b</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"619.953\" y=\"-97.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"619.953\" y=\"-82.8\">a &amp; b</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"505.349\" y=\"-121.8\">{a}</text>\n",
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+        "<polygon fill=\"black\" points=\"588.847,-99.0177 582.46,-103.276 585.394,-99.5932 581.942,-100.169 581.942,-100.169 581.942,-100.169 585.394,-99.5932 581.424,-97.0615 588.847,-99.0177 588.847,-99.0177\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"562.953\" y=\"-108.8\">{a}</text>\n",
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         "<!-- 3&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;2</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"321.872\" y=\"-125.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge6\"><title>3-&gt;2</title>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"379.477\" y=\"-108.8\">{a}</text>\n",
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-        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;4</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-53.8\">{b}</text>\n",
+        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;4</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"676.349\" y=\"-54.8\">!a &amp; b</text>\n",
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+        "<polygon fill=\"none\" points=\"764.953,-79 702.953,-79 702.953,-33 764.953,-33 764.953,-79\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"733.953\" y=\"-59.8\">1</text>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"733.953\" y=\"-44.8\">!a &amp; b</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"452.349\" y=\"-3.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;6</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"392.349\" y=\"-109.8\">{a, b}</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"449.953\" y=\"-92.8\">{a, b}</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-70.8\">{b}</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"619.349\" y=\"-70.8\">{a}</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"619.349\" y=\"-90.8\">{a}</text>\n",
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        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7f2e89e119b0>"
+        "<IPython.core.display.SVG object>"
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        "svg": [
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"62.6978\" y=\"-140.3\">init</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"118\" y=\"-140.3\">init</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"466.396\" y=\"-51.8\">{a}</text>\n",
+        "<path d=\"M516.144,-55.3488C529.678,-49.8349 546.427,-43.0113 561.241,-36.9757\" fill=\"none\" stroke=\"black\"/>\n",
+        "<polygon fill=\"black\" points=\"567.894,-34.2656 562.599,-39.8239 564.652,-35.5862 561.411,-36.9067 561.411,-36.9067 561.411,-36.9067 564.652,-35.5862 560.222,-33.9895 567.894,-34.2656 567.894,-34.2656\" stroke=\"black\"/>\n",
+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"542\" y=\"-51.8\">{a}</text>\n",
         "</g>\n",
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-        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;2</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"302.396\" y=\"-65.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge6\"><title>3-&gt;2</title>\n",
+        "<path d=\"M269.038,-71.72C274.939,-70.7884 281.181,-69.833 287,-69 311.393,-65.5082 317.408,-63.5587 342,-62 365.952,-60.4819 372.006,-61.4786 396,-62 415.44,-62.4224 437.174,-63.3463 454.635,-64.1999\" fill=\"none\" stroke=\"black\"/>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"369\" y=\"-65.8\">{a}</text>\n",
         "</g>\n",
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-        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;4</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-80.8\">{b}</text>\n",
+        "<g class=\"edge\" id=\"edge7\"><title>3-&gt;4</title>\n",
+        "<path d=\"M269.05,-72.8485C285.188,-71.7406 306.166,-71.8454 324,-77 331.103,-79.0531 338.198,-82.587 344.552,-86.434\" fill=\"none\" stroke=\"black\"/>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-80.8\">{b}</text>\n",
         "</g>\n",
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-        "<g class=\"edge\" id=\"edge6\"><title>3-&gt;5</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"353.396\" y=\"-42.8\">{a}</text>\n",
+        "<g class=\"edge\" id=\"edge8\"><title>3-&gt;5</title>\n",
+        "<path d=\"M269.231,-65.3796C275.01,-63.3453 281.153,-61.4125 287,-60 383.846,-36.6029 501.317,-27.2334 560.32,-23.7959\" fill=\"none\" stroke=\"black\"/>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"429\" y=\"-40.8\">{a}</text>\n",
         "</g>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"353.396\" y=\"-94.8\">{a, b}</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"429\" y=\"-92.8\">{a, b}</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"247.896\" y=\"-102.8\">{b}</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"305.5\" y=\"-101.8\">{b}</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"523.396\" y=\"-65.8\">{a}</text>\n",
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+        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"599\" y=\"-65.8\">{a}</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7f2e884949e8>"
+        "<IPython.core.display.SVG object>"
        ]
       }
      ],
      "prompt_number": 5
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [],
-     "language": "python",
-     "metadata": {},
-     "outputs": []
     }
    ],
    "metadata": {}
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  ]
-}
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+}
diff --git a/tests/python/word.ipynb b/tests/python/word.ipynb
index 7e554b7d3..d5e7e61ec 100644
--- a/tests/python/word.ipynb
+++ b/tests/python/word.ipynb
@@ -1,7 +1,23 @@
 {
  "metadata": {
-  "name": "",
-  "signature": "sha256:4fc3934cf5fa0e612923dc4253b5e40115b103a93f588595a6706ec77e7994a9"
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.5.3"
+  },
+  "name": ""
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -31,7 +47,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "aut = spot.translate('G(Fa <-> Xb)'); aut"
+      "aut = spot.translate('G(Fa <-> XXb)'); aut"
      ],
      "language": "python",
      "metadata": {},
@@ -47,99 +63,150 @@
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+        "<text text-anchor=\"middle\" x=\"139\" y=\"-82.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
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+        "<!-- 5 -->\n",
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+        "<g id=\"edge6\" class=\"edge\"><title>1&#45;&gt;5</title>\n",
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+        "</g>\n",
+        "<!-- 2&#45;&gt;4 -->\n",
+        "<g id=\"edge8\" class=\"edge\"><title>2&#45;&gt;4</title>\n",
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+        "</g>\n",
+        "<!-- 6 -->\n",
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+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"436\" cy=\"-22\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"436\" y=\"-18.3\" font-family=\"Lato\" font-size=\"14.00\">6</text>\n",
+        "</g>\n",
+        "<!-- 2&#45;&gt;6 -->\n",
+        "<g id=\"edge9\" class=\"edge\"><title>2&#45;&gt;6</title>\n",
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+        "</g>\n",
+        "<!-- 4&#45;&gt;3 -->\n",
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+        "</g>\n",
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+        "<g id=\"edge14\" class=\"edge\"><title>4&#45;&gt;4</title>\n",
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+        "</g>\n",
+        "<!-- 5&#45;&gt;6 -->\n",
+        "<g id=\"edge15\" class=\"edge\"><title>5&#45;&gt;6</title>\n",
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+        "</g>\n",
+        "<!-- 6&#45;&gt;6 -->\n",
+        "<g id=\"edge16\" class=\"edge\"><title>6&#45;&gt;6</title>\n",
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+        "<text text-anchor=\"start\" x=\"415.5\" y=\"-76.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !b</text>\n",
+        "<text text-anchor=\"start\" x=\"428\" y=\"-61.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
         "</g>\n",
         "</g>\n",
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb71c0e18a0> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fdf783f0510> >"
        ]
       }
      ],
@@ -168,12 +235,12 @@
        "text": [
         "Prefix:\n",
         "  0\n",
-        "  |  !a\n",
-        "Cycle:\n",
+        "  |  a\n",
         "  1\n",
-        "  |  a & b\t{0}\n",
-        "  2\n",
-        "  |  !a & b"
+        "  |  a\n",
+        "Cycle:\n",
+        "  3\n",
+        "  |  a & b\t{0}"
        ]
       }
      ],
@@ -200,7 +267,7 @@
        "output_type": "stream",
        "stream": "stdout",
        "text": [
-        "!a\n",
+        "a\n",
         "{0}\n"
        ]
       }
@@ -228,7 +295,7 @@
        "output_type": "pyout",
        "prompt_number": 5,
        "text": [
-        "!a; cycle{a & b; !a & b}"
+        "a; a; cycle{a & b}"
        ]
       }
      ],
@@ -246,8 +313,8 @@
      "collapsed": false,
      "input": [
       "print(spot.bdd_format_formula(aut.get_dict(), word.prefix[0]))\n",
-      "print(spot.bdd_format_formula(aut.get_dict(), word.cycle[0]))\n",
-      "print(spot.bdd_format_formula(aut.get_dict(), word.cycle[1]))"
+      "print(spot.bdd_format_formula(aut.get_dict(), word.prefix[1]))\n",
+      "print(spot.bdd_format_formula(aut.get_dict(), word.cycle[0]))"
      ],
      "language": "python",
      "metadata": {},
@@ -256,9 +323,9 @@
        "output_type": "stream",
        "stream": "stdout",
        "text": [
-        "!a\n",
-        "a & b\n",
-        "!a & b\n"
+        "a\n",
+        "a\n",
+        "a & b\n"
        ]
       }
      ],
@@ -268,7 +335,7 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Calling `simplifify()` will produce a shorter word that is compatible with the original word. For instance in the above word, the initial `!a` is compatible with both `a & b` and `!a & b`.   The word obtained by restricting `!a` to `!a & b` is therefore still accepted, but it allows removing the prefix by rotating the cycle:"
+      "Calling `simplifify()` will produce a shorter word that is compatible with the original word. For instance in the above word, the initial `a` is compatible with both `a & b` and `a & !b`.   The word obtained by restricting `a` to `a & b` is therefore still accepted, allowing us to remove the prefix."
      ]
     },
     {
@@ -286,7 +353,7 @@
        "output_type": "pyout",
        "prompt_number": 7,
        "text": [
-        "cycle{!a & b; a & b}"
+        "cycle{a & b}"
        ]
       }
      ],
@@ -313,7 +380,7 @@
        "output_type": "pyout",
        "prompt_number": 8,
        "text": [
-        "cycle{!a & b; a & b}"
+        "cycle{a & b}"
        ]
       }
      ],
@@ -478,7 +545,7 @@
         "</svg>\n"
        ],
        "text": [
-        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb71c0e1a20> >"
+        "<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fdf783f0e40> >"
        ]
       }
      ],
@@ -598,9 +665,10 @@
        "evalue": "a twa_word may not have an empty cycle",
        "output_type": "pyerr",
        "traceback": [
-        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mRuntimeError\u001b[0m                              Traceback (most recent call last)",
+        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+        "\u001b[0;31mRuntimeError\u001b[0m                              Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-18-971829bb8f5f>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0;31m# ... as long as this word is not printed.\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mw\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-        "\u001b[0;32m/home/adl/git/spot/python/spot/impl.py\u001b[0m in \u001b[0;36m__str__\u001b[0;34m(self)\u001b[0m\n\u001b[1;32m   3599\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   3600\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0m__str__\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m->\u001b[0m \u001b[0;34m\"std::string\"\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 3601\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0m_impl\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mtwa_word___str__\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   3602\u001b[0m \u001b[0mtwa_word_swigregister\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0m_impl\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mtwa_word_swigregister\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   3603\u001b[0m \u001b[0mtwa_word_swigregister\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mtwa_word\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+        "\u001b[0;32m/home/adl/git/spot/python/spot/impl.py\u001b[0m in \u001b[0;36m__str__\u001b[0;34m(self)\u001b[0m\n\u001b[1;32m   4160\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   4161\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0m__str__\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m->\u001b[0m \u001b[0;34m\"std::string\"\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 4162\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0m_impl\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mtwa_word___str__\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   4163\u001b[0m \u001b[0mtwa_word_swigregister\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0m_impl\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mtwa_word_swigregister\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   4164\u001b[0m \u001b[0mtwa_word_swigregister\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mtwa_word\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
         "\u001b[0;31mRuntimeError\u001b[0m: a twa_word may not have an empty cycle"
        ]
       }
@@ -611,4 +679,4 @@
    "metadata": {}
   }
  ]
-}
\ No newline at end of file
+}

From 526b299de8ea0e2a341b7875d62eb09de7f3f5ea Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Fri, 2 Jun 2017 19:07:34 +0200
Subject: [PATCH 04/13] work around change in pandas 0.20

* tests/core/ltlcross4.test: Replace describe() by agg() to work
around a backward incompatible change in pandas 0.20.
---
 tests/core/ltlcross4.test | 44 +++++++++++++--------------------------
 1 file changed, 15 insertions(+), 29 deletions(-)

diff --git a/tests/core/ltlcross4.test b/tests/core/ltlcross4.test
index 2f0c5f5ca..e710fcfee 100755
--- a/tests/core/ltlcross4.test
+++ b/tests/core/ltlcross4.test
@@ -1,6 +1,6 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2012, 2013, 2014 Laboratoire de Recherche et
+# Copyright (C) 2012-2014, 2017 Laboratoire de Recherche et
 # Développement de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
@@ -40,49 +40,35 @@ cat >test.py <<EOF
 import sys
 try:
   import pandas
+  import numpy as np
 except ImportError:
   sys.exit(77)
 
 x = pandas.read_csv("output.csv")
+# We used to call describe() instead of agg(),
+# but the output of this function was changed
+# in pandas 0.20.
 print(x.filter(('formula', 'tool',
-                'states', 'transitions')).groupby('tool').describe())
+                'states', 'transitions')).\
+        groupby('tool').\
+        agg([np.mean, np.std, np.min, np.max]))
 EOF
 
 # will exit 77 if panda is not installed
 $PYTHON test.py >out.1
 
 # remove trailing whitespace from pandas' output,
-# and limit to 26 lines, because Pandas 0.13 adds
+# and limit to 6 lines, because Pandas 0.13 adds
 # the size of the dataframe afterwards.
-sed 's/[ \t]*$//g;26q' <out.1 > py.out
+sed 's/[ \t]*$//g;6q' <out.1 > py.out
 
 cat >expected <<EOF
-                      states  transitions
+             states                     transitions
+               mean       std amin amax        mean       std amin amax
 tool
-ltl2tgba any count  4.000000     4.000000
-             mean   2.250000    10.000000
-             std    0.957427     5.163978
-             min    1.000000     4.000000
-             25%    1.750000     7.000000
-             50%    2.500000    10.000000
-             75%    3.000000    13.000000
-             max    3.000000    16.000000
-ltl2tgba det count  4.000000     4.000000
-             mean   2.250000     9.250000
-             std    0.957427     4.573474
-             min    1.000000     4.000000
-             25%    1.750000     6.250000
-             50%    2.500000     9.500000
-             75%    3.000000    12.500000
-             max    3.000000    14.000000
-ltl2tgba sma count  4.000000     4.000000
-             mean   2.250000     9.250000
-             std    0.957427     4.573474
-             min    1.000000     4.000000
-             25%    1.750000     6.250000
-             50%    2.500000     9.500000
-             75%    3.000000    12.500000
-             max    3.000000    14.000000
+ltl2tgba any   2.25  0.957427    1    3       10.00  5.163978    4   16
+ltl2tgba det   2.25  0.957427    1    3        9.25  4.573474    4   14
+ltl2tgba sma   2.25  0.957427    1    3        9.25  4.573474    4   14
 EOF
 
 diff py.out expected

From 526e19d4b63a2a01227aec45ef2d8b40bcf23d4d Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Sat, 3 Jun 2017 11:03:58 +0200
Subject: [PATCH 05/13] * tests/core/ltlcross4.test: Ignore space diff in
 pandas' output.

---
 tests/core/ltlcross4.test | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/tests/core/ltlcross4.test b/tests/core/ltlcross4.test
index e710fcfee..84c0ada0d 100755
--- a/tests/core/ltlcross4.test
+++ b/tests/core/ltlcross4.test
@@ -57,18 +57,19 @@ EOF
 # will exit 77 if panda is not installed
 $PYTHON test.py >out.1
 
-# remove trailing whitespace from pandas' output,
-# and limit to 6 lines, because Pandas 0.13 adds
-# the size of the dataframe afterwards.
-sed 's/[ \t]*$//g;6q' <out.1 > py.out
+# remove trailing whitespace from pandas' output, and limit to 6
+# lines, because Pandas 0.13 adds the size of the dataframe
+# afterwards.  Alse the spacing between columns differs from version
+# to version.
+sed 's/[ \t]*$//g;6q' <out.1 | sed 's/  */ /g' > py.out
 
 cat >expected <<EOF
-             states                     transitions
-               mean       std amin amax        mean       std amin amax
+ states transitions
+ mean std amin amax mean std amin amax
 tool
-ltl2tgba any   2.25  0.957427    1    3       10.00  5.163978    4   16
-ltl2tgba det   2.25  0.957427    1    3        9.25  4.573474    4   14
-ltl2tgba sma   2.25  0.957427    1    3        9.25  4.573474    4   14
+ltl2tgba any 2.25 0.957427 1 3 10.00 5.163978 4 16
+ltl2tgba det 2.25 0.957427 1 3 9.25 4.573474 4 14
+ltl2tgba sma 2.25 0.957427 1 3 9.25 4.573474 4 14
 EOF
 
 diff py.out expected

From 440380c5cab8c16cb93fc086312cddd58c91f538 Mon Sep 17 00:00:00 2001
From: Etienne Renault <renault@lrde.epita.fr>
Date: Wed, 7 Jun 2017 17:05:25 +0200
Subject: [PATCH 06/13] ikwiad: fix accepting run printing

* tests/core/ikwiad.cc: here.
---
 tests/core/ikwiad.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/core/ikwiad.cc b/tests/core/ikwiad.cc
index 73a0e9ac8..1e8c6382a 100644
--- a/tests/core/ikwiad.cc
+++ b/tests/core/ikwiad.cc
@@ -1531,7 +1531,7 @@ checked_main(int argc, char** argv)
                               if (graph_run_tgba_opt)
                                 spot::print_dot(std::cout, run->as_twa());
                               else
-                                std::cout << run;
+                                std::cout << *run;
                               tm.stop("printing accepting run");
                             }
                         }

From 97e903b13d9742e2ffd8681b1762de5f3dc9db84 Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Wed, 7 Jun 2017 14:46:55 +0200
Subject: [PATCH 07/13] libtool: surrender to Debian's castrated libtool

The libtool version distributed by Debian is patched to *not* propagate
dependencies (i.e., if libA depends on libB, then linking against libA
will not automatically link against libB, it has to be explicit),
contrary to what the Libtool manual document.  So now we explicitly
link against both libA and libB in such case.

* configure.ac: Remove the workaround that does not work for
MinGW.
* doc/org/compile.org: Mention the issue.
* bin/Makefile.am, tests/Makefile.am, spot/ltsmin/Makefile.am,
doc/org/g++wrap.in: Make the dependencies explicit.
---
 bin/Makefile.am         | 3 ++-
 configure.ac            | 6 ------
 doc/org/compile.org     | 6 ++++--
 doc/org/g++wrap.in      | 3 ++-
 spot/ltsmin/Makefile.am | 2 ++
 tests/Makefile.am       | 5 +++--
 6 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/bin/Makefile.am b/bin/Makefile.am
index 85e5ca059..d1f64ff95 100644
--- a/bin/Makefile.am
+++ b/bin/Makefile.am
@@ -25,7 +25,8 @@ AM_CXXFLAGS = $(WARNING_CXXFLAGS)
 LDADD =						\
   libcommon.a					\
   $(top_builddir)/lib/libgnu.la			\
-  $(top_builddir)/spot/libspot.la
+  $(top_builddir)/spot/libspot.la		\
+  $(top_builddir)/buddy/src/libbddx.la
 
 noinst_LIBRARIES = libcommon.a
 libcommon_a_SOURCES =				\
diff --git a/configure.ac b/configure.ac
index 9489dcf03..f4004c6c0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -171,12 +171,6 @@ AC_CHECK_FUNCS([times kill alarm sigaction])
 LT_CONFIG_LTDL_DIR([ltdl])
 LT_INIT([win32-dll])
 LTDL_INIT([subproject convenience])
-# Debian resets this to no, but this break both Spot and the libtool
-# test suite itself.  Instead of requiring developer to install a
-# non-patched version of Libtool on any Debian they use, we just
-# cancel the effect of Debian's patch here.
-link_all_deplibs=yes
-link_all_deplibs_CXX=yes
 
 AX_BSYMBOLIC
 
diff --git a/doc/org/compile.org b/doc/org/compile.org
index 17c219a8c..7f0bd04bc 100644
--- a/doc/org/compile.org
+++ b/doc/org/compile.org
@@ -210,8 +210,10 @@ library.  This should be as simple as adding =-lbddx= after =-lspot=
 in the first three cases.
 
 In the fourth case where =libtool= is used to link against
-=libspot.la= linking against =libbddx.la= is not necessary because
-Libtool already handles such dependencies.
+=libspot.la= linking against =libbddx.la= should not be necessary because
+Libtool already handles such dependencies.  However the version of =libtool=
+distributed with Debian is patched to ignore those dependencies, so in this
+case you 2
 
 * Additional suggestions
 
diff --git a/doc/org/g++wrap.in b/doc/org/g++wrap.in
index 4bd319840..7a11c0d8b 100755
--- a/doc/org/g++wrap.in
+++ b/doc/org/g++wrap.in
@@ -3,4 +3,5 @@
 # example run from the org-mode file are all linked with Spot.
 exec @top_builddir@/libtool link @CXX@ -std=c++11 -Wall \
      -I@abs_top_builddir@ -I@abs_top_srcdir@ -I@abs_top_srcdir@/buddy/src \
-     "$@" @abs_top_builddir@/spot/libspot.la
+     "$@" @abs_top_builddir@/spot/libspot.la \
+          @abs_top_builddir@/buddy/src/libbddx.la
diff --git a/spot/ltsmin/Makefile.am b/spot/ltsmin/Makefile.am
index fee392da7..3204ba4c9 100644
--- a/spot/ltsmin/Makefile.am
+++ b/spot/ltsmin/Makefile.am
@@ -28,9 +28,11 @@ ltsmin_HEADERS = ltsmin.hh
 lib_LTLIBRARIES = libspotltsmin.la
 libspotltsmin_la_DEPENDENCIES = \
   $(top_builddir)/spot/libspot.la \
+  $(top_builddir)/buddy/src/libbddx.la \
   $(LTDLDEPS)
 libspotltsmin_la_LIBADD = \
   $(top_builddir)/spot/libspot.la \
+  $(top_builddir)/buddy/src/libbddx.la \
   $(LIBLTDL) -lpthread
 libspotltsmin_la_LDFLAGS = -no-undefined $(SYMBOLIC_LDFLAGS)
 libspotltsmin_la_SOURCES = ltsmin.cc
diff --git a/tests/Makefile.am b/tests/Makefile.am
index efc77fe19..fd2d01047 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -24,7 +24,8 @@
 AUTOMAKE_OPTIONS = subdir-objects
 AM_CPPFLAGS = -I$(top_builddir) -I$(top_srcdir) $(BUDDY_CPPFLAGS)
 AM_CXXFLAGS = $(WARNING_CXXFLAGS)
-LDADD = $(top_builddir)/spot/libspot.la
+LDADD = $(top_builddir)/spot/libspot.la $(top_builddir)/buddy/src/libbddx.la
+
 
 # Explicitely set it to avoid default value ".test"
 TEST_EXTENSIONS =
@@ -377,7 +378,7 @@ if USE_LTSMIN
 check_PROGRAMS += ltsmin/modelcheck
 
 ltsmin_modelcheck_SOURCES = ltsmin/modelcheck.cc
-ltsmin_modelcheck_LDADD = $(top_builddir)/spot/ltsmin/libspotltsmin.la
+ltsmin_modelcheck_LDADD = $(top_builddir)/spot/ltsmin/libspotltsmin.la $(LDADD)
 
 check_SCRIPTS += ltsmin/defs
 

From 20a4959ff609d957bc9dcd94b8eb85b6b955b873 Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Mon, 19 Jun 2017 17:06:56 +0200
Subject: [PATCH 08/13] stats: fix slow %s and inappropriate %S output

Fixes #269.

* spot/twaalgos/stats.cc: Use twa_statistics instead of
twa_sub_statistics when %t is not used.
* bin/common_aoutput.cc: Likewise, also fix %S to use twa_statistics
instead of num_states(), and document that %s,%t,%e all return
statistics about the reachable part of the automaton.
* tests/core/format.test: Add more tests.
* NEWS: Document the issue.
---
 NEWS                   |  6 ++++
 bin/common_aoutput.cc  | 18 +++++-------
 spot/twaalgos/stats.cc |  2 +-
 tests/core/format.test | 66 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 81 insertions(+), 11 deletions(-)

diff --git a/NEWS b/NEWS
index 86bb18e02..21d59a354 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,12 @@ New in spot 2.3.4.dev (not yet released)
     SCC) or 'y' (split universal destination by colors) universal
     edges could be connected to undefined states.
 
+  - Using --stats=%s or --stats=%s or --stats=%t could take an
+    unnecessary long time on automata with many atomic propositions,
+    due to a typo.  Furthermore, %s/%e/%t/%E/%T were printing
+    a number of reachable states/edges/transitions, but %S was
+    incorrectly counting all states even unreachable.
+
 New in spot 2.3.4 (2017-05-11)
 
   Bugs fixed:
diff --git a/bin/common_aoutput.cc b/bin/common_aoutput.cc
index 18a9ef6fb..10ddaee8b 100644
--- a/bin/common_aoutput.cc
+++ b/bin/common_aoutput.cc
@@ -166,11 +166,11 @@ static const argp_option io_options[] =
     { "%M, %m", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
       "name of the automaton", 0 },
     { "%S, %s", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
-      "number of states", 0 },
+      "number of reachable states", 0 },
     { "%E, %e", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
-      "number of edges", 0 },
+      "number of reachable edges", 0 },
     { "%T, %t", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
-      "number of transitions", 0 },
+      "number of reachable transitions", 0 },
     { "%A, %a", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
       "number of acceptance sets", 0 },
     { "%G, %g", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
@@ -227,11 +227,11 @@ static const argp_option o_options[] =
     { "%m", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
       "name of the automaton", 0 },
     { "%s", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
-      "number of states", 0 },
+      "number of reachable states", 0 },
     { "%e", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
-      "number of edges", 0 },
+      "number of reachable edges", 0 },
     { "%t", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
-      "number of transitions", 0 },
+      "number of reachable transitions", 0 },
     { "%a", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
       "number of acceptance sets", 0 },
     { "%g", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
@@ -422,9 +422,9 @@ hoa_stat_printer::print(const spot::const_parsed_aut_ptr& haut,
           haut_edges_ = s.edges;
           haut_trans_ = s.transitions;
         }
-      else if (has('E'))
+      else if (has('E') || has('S'))
         {
-          spot::twa_sub_statistics s = sub_stats_reachable(haut->aut);
+          spot::twa_statistics s = stats_reachable(haut->aut);
           haut_states_ = s.states;
           haut_edges_ = s.edges;
         }
@@ -436,8 +436,6 @@ hoa_stat_printer::print(const spot::const_parsed_aut_ptr& haut,
           else
             haut_name_.val().clear();
         }
-      if (has('S'))
-        haut_states_ = haut->aut->num_states();
 
       if (has('A'))
         haut_acc_ = haut->aut->acc().num_sets();
diff --git a/spot/twaalgos/stats.cc b/spot/twaalgos/stats.cc
index e521c7efe..db9c998b7 100644
--- a/spot/twaalgos/stats.cc
+++ b/spot/twaalgos/stats.cc
@@ -346,7 +346,7 @@ namespace spot
       }
     else if (has('s') || has('e'))
       {
-        twa_sub_statistics s = sub_stats_reachable(aut);
+        twa_statistics s = stats_reachable(aut);
         states_ = s.states;
         edges_ = s.edges;
       }
diff --git a/tests/core/format.test b/tests/core/format.test
index 5b5073241..8f178b3ba 100644
--- a/tests/core/format.test
+++ b/tests/core/format.test
@@ -74,3 +74,69 @@ test "1,3,1,3,2,1,0" = "$out"
 ltl2tgba 'a' --stats='%[z]c' 2>stderr && exit 1
 cat stderr
 grep -F "ltl2tgba: unknown option 'z' in '%[z]c'" stderr
+
+
+# From issue #269.
+f='!X(FG((a & b) | (a & c) | (a & d) | (a & e) | (a & f) | (g & h) |
+(g & i) | (g & j) | (g & k) | (g & l) | (m & n) | (m & o) | (m & p) |
+(m & q) | (m & r) | (s & t) | (s & u) | (s & v) | (s & w) | (s & x) |
+(y & z) | (ab & y) | (bb & y) | (cb & y) | (db & y) | (eb & g) | (c &
+eb) | (d & eb) | (e & eb) | (eb & f) | (b & m) | (b & i) | (b & j) |
+(b & k) | (b & l) | (h & s) | (h & o) | (h & p) | (h & q) | (h & r) |
+(n & y) | (n & u) | (n & v) | (n & w) | (n & x) | (fb & t) | (ab & t)
+| (bb & t) | (cb & t) | (db & t) | (g & gb) | (b & gb) | (d & gb) |
+(e & gb) | (f & gb) | (c & m) | (c & h) | (c & j) | (c & k) | (c & l) |
+(i & s) | (i & n) | (i & p) | (i & q) | (i & r) | (o & y) | (o & t) |
+(o & v) | (o & w) | (o & x) | (fb & u) | (u & z) | (bb & u) | (cb &
+u) | (db & u) | (g & hb) | (b & hb) | (c & hb) | (e & hb) | (f & hb) |
+(d & m) | (d & h) | (d & i) | (d & k) | (d & l) | (j & s) | (j & n) |
+(j & o) | (j & q) | (j & r) | (p & y) | (p & t) | (p & u) | (p & w) |
+(p & x) | (fb & v) | (v & z) | (ab & v) | (cb & v) | (db & v) | (g &
+ib) | (b & ib) | (c & ib) | (d & ib) | (f & ib) | (e & m) | (e & h) |
+(e & i) | (e & j) | (e & l) | (k & s) | (k & n) | (k & o) | (k & p) |
+(k & r) | (q & y) | (q & t) | (q & u) | (q & v) | (q & x) | (fb & w) |
+(w & z) | (ab & w) | (bb & w) | (db & w) | (g & jb) | (b & jb) | (c &
+jb) | (d & jb) | (e & jb) | (f & m) | (f & h) | (f & i) | (f & j) |
+(f & k) | (l & s) | (l & n) | (l & o) | (l & p) | (l & q) | (r & y) |
+(r & t) | (r & u) | (r & v) | (r & w) | (fb & x) | (x & z) | (ab & x) |
+(bb & x) | (cb & x)) U ((a & b) | (a & c) | (a & d) | (a & e) | (a & f) |
+(g & h) | (g & i) | (g & j) | (g & k) | (g & l) | (m & n) | (m & o) |
+(m & p) | (m & q) | (m & r) | (s & t) | (s & u) | (s & v) | (s & w) |
+(s & x) | (y & z) | (ab & y) | (bb & y) | (cb & y) | (db & y) | (eb &
+g) | (c & eb) | (d & eb) | (e & eb) | (eb & f) | (b & m) | (b & i) |
+(b & j) | (b & k) | (b & l) | (h & s) | (h & o) | (h & p) | (h & q) |
+(h & r) | (n & y) | (n & u) | (n & v) | (n & w) | (n & x) | (fb & t) |
+(ab & t) | (bb & t) | (cb & t) | (db & t) | (g & gb) | (b & gb) | (d &
+gb) | (e & gb) | (f & gb) | (c & m) | (c & h) | (c & j) | (c & k) |
+(c & l) | (i & s) | (i & n) | (i & p) | (i & q) | (i & r) | (o & y) |
+(o & t) | (o & v) | (o & w) | (o & x) | (fb & u) | (u & z) | (bb & u)
+| (cb & u) | (db & u) | (g & hb) | (b & hb) | (c & hb) | (e & hb) |
+(f & hb) | (d & m) | (d & h) | (d & i) | (d & k) | (d & l) | (j & s) |
+(j & n) | (j & o) | (j & q) | (j & r) | (p & y) | (p & t) | (p & u) |
+(p & w) | (p & x) | (fb & v) | (v & z) | (ab & v) | (cb & v) | (db &
+v) | (g & ib) | (b & ib) | (c & ib) | (d & ib) | (f & ib) | (e & m) |
+(e & h) | (e & i) | (e & j) | (e & l) | (k & s) | (k & n) | (k & o) |
+(k & p) | (k & r) | (q & y) | (q & t) | (q & u) | (q & v) | (q & x) |
+(fb & w) | (w & z) | (ab & w) | (bb & w) | (db & w) | (g & jb) | (b &
+jb) | (c & jb) | (d & jb) | (e & jb) | (f & m) | (f & h) | (f & i) |
+(f & j) | (f & k) | (l & s) | (l & n) | (l & o) | (l & p) | (l & q) |
+(r & y) | (r & t) | (r & u) | (r & v) | (r & w) | (fb & x) | (x & z) |
+(ab & x) | (bb & x) | (cb & x)))'
+test 3,5 = `ltl2tgba --low --any --stats=%s,%e "$f"`
+
+cat >foo <<EOF
+HOA: v1
+States: 3
+Start: 0
+AP: 0
+Acceptance: 0 t
+--BODY--
+State: 0
+[t] 1
+State: 1
+[t] 0
+State: 2
+[t] 2
+--END--
+EOF
+test 2,2 = `autfilt --stats=%S,%s foo`

From 2dd134b0aa6051dbc698a51b14d18c541448ad08 Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Mon, 19 Jun 2017 18:00:10 +0200
Subject: [PATCH 09/13] doc: Jessie -> Stretch

* doc/org/install.org: Update.
---
 doc/org/install.org | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/doc/org/install.org b/doc/org/install.org
index c60d5c64d..871cdf512 100644
--- a/doc/org/install.org
+++ b/doc/org/install.org
@@ -55,7 +55,7 @@ process.
 
 We build Debian packages for amd64 and i386, for both releases and the
 development versions.  Packages for releases are built for Debian
-Jessie (a.k.a. Debian stable) while packages for development are built
+Stretch (a.k.a. Debian stable) while packages for development are built
 for Sid (a.k.a. Debian unstable).
 
 Here is how to install the stable packages:
@@ -83,12 +83,6 @@ examples).  The packages containing the libraries (=libspot0=,
 =libbddx0=, =libspotltsmin0=) are automatically installed as
 dependencies of the previous packages.
 
-The stable packages should work in a recent *Ubuntu* as well, provided you
-also add a path to a repository that distributes the GCC 4.9 runtime.
-You can do that for instance with:
-
-#+BEGIN_SRC sh
-add-apt-repository -y ppa:ubuntu-toolchain-r/test
 #+END_SRC
 
 * Installing from git

From 3f71521625d421d819d2a83c1f215d735620dd5b Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Tue, 20 Jun 2017 15:17:28 +0200
Subject: [PATCH 10/13] [buddy] fix handling of bdd_apply_biimp

* src/bddop.c: Fix shortcut.
---
 buddy/src/bddop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/buddy/src/bddop.c b/buddy/src/bddop.c
index b61eb9a96..5bd5821ee 100644
--- a/buddy/src/bddop.c
+++ b/buddy/src/bddop.c
@@ -656,8 +656,8 @@ static BDD apply_rec(BDD l, BDD r)
            l = r;                                       \
            r = tmp;                                     \
          }                                              \
-       if (ISCONST(l))                                  \
-         return 0;                                      \
+       if (ISONE(l))                                    \
+         return rec(r);                                 \
        break;                                           \
      case bddop_less:  /* l < r = r - l */              \
        {                                                \

From d62d8482087d8422139483353d65482886a167b9 Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Tue, 20 Jun 2017 16:09:56 +0200
Subject: [PATCH 11/13] ltsmin: catch exceptions by reference

* spot/ltsmin/ltsmin.cc, tests/ltsmin/modelcheck.cc: Here.
---
 spot/ltsmin/ltsmin.cc      | 2 +-
 tests/ltsmin/modelcheck.cc | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/spot/ltsmin/ltsmin.cc b/spot/ltsmin/ltsmin.cc
index b8e53610d..8dd65c309 100644
--- a/spot/ltsmin/ltsmin.cc
+++ b/spot/ltsmin/ltsmin.cc
@@ -1112,7 +1112,7 @@ namespace spot
       {
         convert_aps(to_observe, iface, dict, dead, *ps);
       }
-    catch (std::runtime_error)
+    catch (const std::runtime_error&)
       {
         delete ps;
         dict->unregister_all_my_variables(iface.get());
diff --git a/tests/ltsmin/modelcheck.cc b/tests/ltsmin/modelcheck.cc
index 1b32d285e..7a5cc9f7e 100644
--- a/tests/ltsmin/modelcheck.cc
+++ b/tests/ltsmin/modelcheck.cc
@@ -1,5 +1,5 @@
 // -*- coding: utf-8 -*-
-// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016 Laboratoire de
+// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016, 2017 Laboratoire de
 // Recherche et Developpement de l'Epita (LRDE)
 //
 // This file is part of Spot, a model checking library.
@@ -282,7 +282,7 @@ checked_main(int argc, char **argv)
           {
             res = ec->check();
           }
-        catch (std::bad_alloc)
+        catch (const std::bad_alloc&)
           {
             std::cerr << "Out of memory during emptiness check."
                       << std::endl;
@@ -326,7 +326,7 @@ checked_main(int argc, char **argv)
               {
                 run = res->accepting_run();
               }
-            catch (std::bad_alloc)
+            catch (const std::bad_alloc&)
               {
                 std::cerr << "Out of memory while looking for counterexample."
                           << std::endl;

From af000edbf929800872a9de8a851139d33feab0d2 Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Thu, 22 Jun 2017 06:58:01 +0200
Subject: [PATCH 12/13] Release Spot 2.3.5

* NEWS, configure.ac, doc/org/setup.org: Update version.
---
 NEWS              |  7 +++++--
 configure.ac      |  2 +-
 doc/org/setup.org | 10 +++++-----
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/NEWS b/NEWS
index 21d59a354..277178a3b 100644
--- a/NEWS
+++ b/NEWS
@@ -1,8 +1,8 @@
-New in spot 2.3.4.dev (not yet released)
+New in spot 2.3.5 (2017-06-22)
 
   Bugs fixed:
 
-  - We have fixed new cases where translating multiple formula in a
+  - We have fixed new cases where translating multiple formulas in a
     single ltl2tgba run could produce automata different from those
     produced by individual runs.
 
@@ -17,6 +17,9 @@ New in spot 2.3.4.dev (not yet released)
     a number of reachable states/edges/transitions, but %S was
     incorrectly counting all states even unreachable.
 
+  - Our verson of BuDDy had an incorrect optimization for the
+    biimp operator.
+
 New in spot 2.3.4 (2017-05-11)
 
   Bugs fixed:
diff --git a/configure.ac b/configure.ac
index f4004c6c0..d94d434be 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,7 +21,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ([2.61])
-AC_INIT([spot], [2.3.4.dev], [spot@lrde.epita.fr])
+AC_INIT([spot], [2.3.5], [spot@lrde.epita.fr])
 AC_CONFIG_AUX_DIR([tools])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([1.11 gnu tar-ustar color-tests parallel-tests])
diff --git a/doc/org/setup.org b/doc/org/setup.org
index 9e28e96ca..d1b1c869d 100644
--- a/doc/org/setup.org
+++ b/doc/org/setup.org
@@ -1,8 +1,8 @@
 #+OPTIONS: H:2 num:nil toc:t html-postamble:nil
 #+EMAIL: spot@lrde.epita.fr
 #+HTML_LINK_HOME: index.html
-#+MACRO: SPOTVERSION 2.3.4
-#+MACRO: LASTRELEASE 2.3.4
-#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.3.4.tar.gz][=spot-2.3.4.tar.gz=]]
-#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-3-4/NEWS][summary of the changes]]
-#+MACRO: LASTDATE 2017-05-11
+#+MACRO: SPOTVERSION 2.3.5
+#+MACRO: LASTRELEASE 2.3.5
+#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.3.5.tar.gz][=spot-2.3.5.tar.gz=]]
+#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-3-5/NEWS][summary of the changes]]
+#+MACRO: LASTDATE 2017-06-22

From 6c3daf0cd4319d84891cfb586f9ec9168db2a70e Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Thu, 22 Jun 2017 07:03:15 +0200
Subject: [PATCH 13/13] bump version

* NEWS, configure.ac: Bump version to 2.3.5.dev.
---
 NEWS         | 4 ++++
 configure.ac | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index 277178a3b..56b7760e7 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+New in spot 2.3.5.dev (not yet released)
+
+  Nothing yet.
+
 New in spot 2.3.5 (2017-06-22)
 
   Bugs fixed:
diff --git a/configure.ac b/configure.ac
index d94d434be..b81b820d6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,7 +21,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ([2.61])
-AC_INIT([spot], [2.3.5], [spot@lrde.epita.fr])
+AC_INIT([spot], [2.3.5.dev], [spot@lrde.epita.fr])
 AC_CONFIG_AUX_DIR([tools])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([1.11 gnu tar-ustar color-tests parallel-tests])