diff --git a/.#my_bliss.pyx b/.#my_bliss.pyx
new file mode 120000
index 0000000..2da3818
--- /dev/null
+++ b/.#my_bliss.pyx
@@ -0,0 +1 @@
+sholtzen@Stevens-MacBook-Pro.local.13952
\ No newline at end of file
diff --git a/benchmarks.py b/benchmarks.py
new file mode 100644
index 0000000..ce4d7c7
--- /dev/null
+++ b/benchmarks.py
@@ -0,0 +1,15 @@
+from my_graphs import *
+import cProfile, pstats, StringIO
+from collections import deque
+import my_bliss
+import timeit
+
+
+G = graphs.CycleGraph(500)
+
+def my_fun():
+    my_bliss.canonical_form(G, certificate=True, return_graph=False)
+
+
+if __name__ == "__main__":
+    print timeit.timeit(stmt="my_fun()", setup="from __main__ import my_fun", number=100)
diff --git a/my_bliss.c b/my_bliss.c
deleted file mode 100644
index 06f2230..0000000
--- a/my_bliss.c
+++ /dev/null
@@ -1 +0,0 @@
-#error Do not use this file, it is the result of a failed Cython compilation.
diff --git a/my_bliss.cpp b/my_bliss.cpp
index 04ba653..d6d7672 100644
--- a/my_bliss.cpp
+++ b/my_bliss.cpp
@@ -904,7 +904,7 @@ struct __pyx_opt_args_8my_bliss_automorphism_group;
 struct __pyx_opt_args_8my_bliss_orbits_and_canonical_labeling;
 struct __pyx_opt_args_8my_bliss_raw_automorphism_generators;
 
-/* "my_bliss.pyx":287
+/* "my_bliss.pyx":288
  * #####################################################
  * 
  * cdef canonical_form_from_edge_list(int Vnr, list Vout, list Vin, int Lnr=1, list labels=[],             # <<<<<<<<<<<<<<
@@ -920,7 +920,7 @@ struct __pyx_opt_args_8my_bliss_canonical_form_from_edge_list {
   int certificate;
 };
 
-/* "my_bliss.pyx":369
+/* "my_bliss.pyx":370
  *         return new_edges
  * 
  * cpdef canonical_form(G, partition=None, return_graph=False, use_edge_labels=True, certificate=False):             # <<<<<<<<<<<<<<
@@ -935,7 +935,7 @@ struct __pyx_opt_args_8my_bliss_canonical_form {
   PyObject *certificate;
 };
 
-/* "my_bliss.pyx":498
+/* "my_bliss.pyx":499
  * #####################################################
  * 
  * cdef automorphism_group_gens_from_edge_list(int Vnr, Vout, Vin, int Lnr=1, labels=[],             # <<<<<<<<<<<<<<
@@ -951,7 +951,7 @@ struct __pyx_opt_args_8my_bliss_automorphism_group_gens_from_edge_list {
   int directed;
 };
 
-/* "my_bliss.pyx":559
+/* "my_bliss.pyx":560
  * 
  * 
  * cpdef automorphism_group(G, partition=None, use_edge_labels=True):             # <<<<<<<<<<<<<<
@@ -964,7 +964,7 @@ struct __pyx_opt_args_8my_bliss_automorphism_group {
   PyObject *use_edge_labels;
 };
 
-/* "my_bliss.pyx":750
+/* "my_bliss.pyx":751
  * 
  * 
  * cpdef orbits_and_canonical_labeling(G, partition=None, use_edge_labels=True):             # <<<<<<<<<<<<<<
@@ -977,7 +977,7 @@ struct __pyx_opt_args_8my_bliss_orbits_and_canonical_labeling {
   PyObject *use_edge_labels;
 };
 
-/* "my_bliss.pyx":866
+/* "my_bliss.pyx":867
  *     return g
  * 
  * cpdef raw_automorphism_generators(G, partition=None, use_edge_labels=True):             # <<<<<<<<<<<<<<
@@ -1811,6 +1811,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form(PyObject *, int __pyx_skip_dis
 static PyObject *__pyx_f_8my_bliss_automorphism_group_gens_from_edge_list(int, PyObject *, PyObject *, struct __pyx_opt_args_8my_bliss_automorphism_group_gens_from_edge_list *__pyx_optional_args); /*proto*/
 static PyObject *__pyx_f_8my_bliss_automorphism_group(PyObject *, int __pyx_skip_dispatch, struct __pyx_opt_args_8my_bliss_automorphism_group *__pyx_optional_args); /*proto*/
 static PyObject *__pyx_f_8my_bliss_orbits_and_canonical_labeling(PyObject *, int __pyx_skip_dispatch, struct __pyx_opt_args_8my_bliss_orbits_and_canonical_labeling *__pyx_optional_args); /*proto*/
+static PyObject *__pyx_f_8my_bliss_bliss_graph(PyObject *, PyObject *, PyObject *, PyObject *, int __pyx_skip_dispatch); /*proto*/
 static PyObject *__pyx_f_8my_bliss_raw_automorphism_generators(PyObject *, int __pyx_skip_dispatch, struct __pyx_opt_args_8my_bliss_raw_automorphism_generators *__pyx_optional_args); /*proto*/
 #define __Pyx_MODULE_NAME "my_bliss"
 extern int __pyx_module_is_main_my_bliss;
@@ -1841,7 +1842,9 @@ static const char __pyx_k_labels[] = "labels";
 static const char __pyx_k_sorted[] = "sorted";
 static const char __pyx_k_DiGraph[] = "DiGraph";
 static const char __pyx_k_KeyError[] = "KeyError";
+static const char __pyx_k_int2vert[] = "int2vert";
 static const char __pyx_k_operator[] = "operator";
+static const char __pyx_k_vert2int[] = "vert2int";
 static const char __pyx_k_enumerate[] = "enumerate";
 static const char __pyx_k_iteritems[] = "iteritems";
 static const char __pyx_k_partition[] = "partition";
@@ -1886,6 +1889,7 @@ static PyObject *__pyx_n_s_extend;
 static PyObject *__pyx_kp_s_failed_to_allocate_s_bytes;
 static PyObject *__pyx_kp_s_failed_to_allocate_s_s_bytes;
 static PyObject *__pyx_n_s_import;
+static PyObject *__pyx_n_s_int2vert;
 static PyObject *__pyx_n_s_is_directed;
 static PyObject *__pyx_n_s_itemgetter;
 static PyObject *__pyx_n_s_items;
@@ -1907,10 +1911,12 @@ static PyObject *__pyx_n_s_sage_groups_perm_gps_permgroup;
 static PyObject *__pyx_n_s_sorted;
 static PyObject *__pyx_n_s_test;
 static PyObject *__pyx_n_s_use_edge_labels;
+static PyObject *__pyx_n_s_vert2int;
 static PyObject *__pyx_pf_8my_bliss_canonical_form(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_G, PyObject *__pyx_v_partition, PyObject *__pyx_v_return_graph, PyObject *__pyx_v_use_edge_labels, PyObject *__pyx_v_certificate); /* proto */
 static PyObject *__pyx_pf_8my_bliss_2automorphism_group(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_G, PyObject *__pyx_v_partition, PyObject *__pyx_v_use_edge_labels); /* proto */
 static PyObject *__pyx_pf_8my_bliss_4orbits_and_canonical_labeling(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_G, PyObject *__pyx_v_partition, PyObject *__pyx_v_use_edge_labels); /* proto */
-static PyObject *__pyx_pf_8my_bliss_6raw_automorphism_generators(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_G, PyObject *__pyx_v_partition, PyObject *__pyx_v_use_edge_labels); /* proto */
+static PyObject *__pyx_pf_8my_bliss_6bliss_graph(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_G, PyObject *__pyx_v_partition, PyObject *__pyx_v_vert2int, PyObject *__pyx_v_int2vert); /* proto */
+static PyObject *__pyx_pf_8my_bliss_8raw_automorphism_generators(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_G, PyObject *__pyx_v_partition, PyObject *__pyx_v_use_edge_labels); /* proto */
 static __Pyx_CachedCFunction __pyx_umethod_PyDict_Type_items = {0, &__pyx_n_s_items, 0, 0, 0};
 static __Pyx_CachedCFunction __pyx_umethod_PyDict_Type_iteritems = {0, &__pyx_n_s_iteritems, 0, 0, 0};
 static PyObject *__pyx_int_0;
@@ -1922,7 +1928,7 @@ static PyObject *__pyx_tuple_;
 /* Late includes */
 #include "macros.h"
 
-/* "my_bliss.pyx":69
+/* "my_bliss.pyx":70
  *         unsigned int get_hash()
  * 
  * cdef void add_gen(void *user_param, unsigned int n, const unsigned int *aut):             # <<<<<<<<<<<<<<
@@ -1955,9 +1961,9 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
   int __pyx_t_11;
   int __pyx_t_12;
   __Pyx_RefNannySetupContext("add_gen", 0);
-  __Pyx_TraceCall("add_gen", __pyx_f[0], 69, 0, __PYX_ERR(0, 69, __pyx_L1_error));
+  __Pyx_TraceCall("add_gen", __pyx_f[0], 70, 0, __PYX_ERR(0, 70, __pyx_L1_error));
 
-  /* "my_bliss.pyx":87
+  /* "my_bliss.pyx":88
  *     - ``aut`` -- ``int *``; an automorphism of the graph
  *     """
  *     cdef int tmp    = 0             # <<<<<<<<<<<<<<
@@ -1966,7 +1972,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
  */
   __pyx_v_tmp = 0;
 
-  /* "my_bliss.pyx":88
+  /* "my_bliss.pyx":89
  *     """
  *     cdef int tmp    = 0
  *     cdef int marker = 0             # <<<<<<<<<<<<<<
@@ -1975,7 +1981,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
  */
   __pyx_v_marker = 0;
 
-  /* "my_bliss.pyx":89
+  /* "my_bliss.pyx":90
  *     cdef int tmp    = 0
  *     cdef int marker = 0
  *     cdef int cur    = 0             # <<<<<<<<<<<<<<
@@ -1984,29 +1990,29 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
  */
   __pyx_v_cur = 0;
 
-  /* "my_bliss.pyx":90
+  /* "my_bliss.pyx":91
  *     cdef int marker = 0
  *     cdef int cur    = 0
  *     cdef list perm  = []             # <<<<<<<<<<<<<<
  *     cdef bint* done = <bint*> check_calloc(n, sizeof(bint))
  *     cdef int i
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 90, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 91, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_perm = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":91
+  /* "my_bliss.pyx":92
  *     cdef int cur    = 0
  *     cdef list perm  = []
  *     cdef bint* done = <bint*> check_calloc(n, sizeof(bint))             # <<<<<<<<<<<<<<
  *     cdef int i
  *     for i in range(n):
  */
-  __pyx_t_2 = __pyx_f_9cysignals_6memory_check_calloc(__pyx_v_n, (sizeof(int))); if (unlikely(__pyx_t_2 == ((void *)NULL) && PyErr_Occurred())) __PYX_ERR(0, 91, __pyx_L1_error)
+  __pyx_t_2 = __pyx_f_9cysignals_6memory_check_calloc(__pyx_v_n, (sizeof(int))); if (unlikely(__pyx_t_2 == ((void *)NULL) && PyErr_Occurred())) __PYX_ERR(0, 92, __pyx_L1_error)
   __pyx_v_done = ((int *)__pyx_t_2);
 
-  /* "my_bliss.pyx":93
+  /* "my_bliss.pyx":94
  *     cdef bint* done = <bint*> check_calloc(n, sizeof(bint))
  *     cdef int i
  *     for i in range(n):             # <<<<<<<<<<<<<<
@@ -2018,7 +2024,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
   for (__pyx_t_5 = 0; __pyx_t_5 < __pyx_t_4; __pyx_t_5+=1) {
     __pyx_v_i = __pyx_t_5;
 
-    /* "my_bliss.pyx":94
+    /* "my_bliss.pyx":95
  *     cdef int i
  *     for i in range(n):
  *         done[i] = False             # <<<<<<<<<<<<<<
@@ -2028,7 +2034,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
     (__pyx_v_done[__pyx_v_i]) = 0;
   }
 
-  /* "my_bliss.pyx":96
+  /* "my_bliss.pyx":97
  *         done[i] = False
  * 
  *     gens, int_to_vertex = <object> <PyObject *> user_param             # <<<<<<<<<<<<<<
@@ -2043,7 +2049,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
     if (unlikely(size != 2)) {
       if (size > 2) __Pyx_RaiseTooManyValuesError(2);
       else if (size >= 0) __Pyx_RaiseNeedMoreValuesError(size);
-      __PYX_ERR(0, 96, __pyx_L1_error)
+      __PYX_ERR(0, 97, __pyx_L1_error)
     }
     #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
     if (likely(PyTuple_CheckExact(sequence))) {
@@ -2056,15 +2062,15 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
     __Pyx_INCREF(__pyx_t_6);
     __Pyx_INCREF(__pyx_t_7);
     #else
-    __pyx_t_6 = PySequence_ITEM(sequence, 0); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 96, __pyx_L1_error)
+    __pyx_t_6 = PySequence_ITEM(sequence, 0); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 97, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_6);
-    __pyx_t_7 = PySequence_ITEM(sequence, 1); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 96, __pyx_L1_error)
+    __pyx_t_7 = PySequence_ITEM(sequence, 1); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 97, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_7);
     #endif
     __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
   } else {
     Py_ssize_t index = -1;
-    __pyx_t_8 = PyObject_GetIter(__pyx_t_1); if (unlikely(!__pyx_t_8)) __PYX_ERR(0, 96, __pyx_L1_error)
+    __pyx_t_8 = PyObject_GetIter(__pyx_t_1); if (unlikely(!__pyx_t_8)) __PYX_ERR(0, 97, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_8);
     __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
     __pyx_t_9 = Py_TYPE(__pyx_t_8)->tp_iternext;
@@ -2072,7 +2078,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
     __Pyx_GOTREF(__pyx_t_6);
     index = 1; __pyx_t_7 = __pyx_t_9(__pyx_t_8); if (unlikely(!__pyx_t_7)) goto __pyx_L5_unpacking_failed;
     __Pyx_GOTREF(__pyx_t_7);
-    if (__Pyx_IternextUnpackEndCheck(__pyx_t_9(__pyx_t_8), 2) < 0) __PYX_ERR(0, 96, __pyx_L1_error)
+    if (__Pyx_IternextUnpackEndCheck(__pyx_t_9(__pyx_t_8), 2) < 0) __PYX_ERR(0, 97, __pyx_L1_error)
     __pyx_t_9 = NULL;
     __Pyx_DECREF(__pyx_t_8); __pyx_t_8 = 0;
     goto __pyx_L6_unpacking_done;
@@ -2080,7 +2086,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
     __Pyx_DECREF(__pyx_t_8); __pyx_t_8 = 0;
     __pyx_t_9 = NULL;
     if (__Pyx_IterFinish() == 0) __Pyx_RaiseNeedMoreValuesError(index);
-    __PYX_ERR(0, 96, __pyx_L1_error)
+    __PYX_ERR(0, 97, __pyx_L1_error)
     __pyx_L6_unpacking_done:;
   }
   __pyx_v_gens = __pyx_t_6;
@@ -2088,7 +2094,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
   __pyx_v_int_to_vertex = __pyx_t_7;
   __pyx_t_7 = 0;
 
-  /* "my_bliss.pyx":98
+  /* "my_bliss.pyx":99
  *     gens, int_to_vertex = <object> <PyObject *> user_param
  * 
  *     while True:             # <<<<<<<<<<<<<<
@@ -2097,7 +2103,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
  */
   while (1) {
 
-    /* "my_bliss.pyx":99
+    /* "my_bliss.pyx":100
  * 
  *     while True:
  *         while cur < n and done[cur]:             # <<<<<<<<<<<<<<
@@ -2116,7 +2122,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
       __pyx_L11_bool_binop_done:;
       if (!__pyx_t_10) break;
 
-      /* "my_bliss.pyx":100
+      /* "my_bliss.pyx":101
  *     while True:
  *         while cur < n and done[cur]:
  *             cur += 1             # <<<<<<<<<<<<<<
@@ -2126,7 +2132,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
       __pyx_v_cur = (__pyx_v_cur + 1);
     }
 
-    /* "my_bliss.pyx":101
+    /* "my_bliss.pyx":102
  *         while cur < n and done[cur]:
  *             cur += 1
  *         if cur == n:             # <<<<<<<<<<<<<<
@@ -2136,7 +2142,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
     __pyx_t_10 = ((__pyx_v_cur == __pyx_v_n) != 0);
     if (__pyx_t_10) {
 
-      /* "my_bliss.pyx":102
+      /* "my_bliss.pyx":103
  *             cur += 1
  *         if cur == n:
  *             break             # <<<<<<<<<<<<<<
@@ -2145,7 +2151,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
  */
       goto __pyx_L8_break;
 
-      /* "my_bliss.pyx":101
+      /* "my_bliss.pyx":102
  *         while cur < n and done[cur]:
  *             cur += 1
  *         if cur == n:             # <<<<<<<<<<<<<<
@@ -2154,7 +2160,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
  */
     }
 
-    /* "my_bliss.pyx":104
+    /* "my_bliss.pyx":105
  *             break
  * 
  *         marker = tmp = cur             # <<<<<<<<<<<<<<
@@ -2164,16 +2170,16 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
     __pyx_v_marker = __pyx_v_cur;
     __pyx_v_tmp = __pyx_v_cur;
 
-    /* "my_bliss.pyx":105
+    /* "my_bliss.pyx":106
  * 
  *         marker = tmp = cur
  *         cycle = [int_to_vertex[cur]]             # <<<<<<<<<<<<<<
  *         done[cur] = True
  * 
  */
-    __pyx_t_1 = __Pyx_GetItemInt(__pyx_v_int_to_vertex, __pyx_v_cur, int, 1, __Pyx_PyInt_From_int, 0, 1, 1); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 105, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_GetItemInt(__pyx_v_int_to_vertex, __pyx_v_cur, int, 1, __Pyx_PyInt_From_int, 0, 1, 1); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 106, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
-    __pyx_t_7 = PyList_New(1); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 105, __pyx_L1_error)
+    __pyx_t_7 = PyList_New(1); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 106, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_7);
     __Pyx_GIVEREF(__pyx_t_1);
     PyList_SET_ITEM(__pyx_t_7, 0, __pyx_t_1);
@@ -2181,7 +2187,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
     __Pyx_XDECREF_SET(__pyx_v_cycle, ((PyObject*)__pyx_t_7));
     __pyx_t_7 = 0;
 
-    /* "my_bliss.pyx":106
+    /* "my_bliss.pyx":107
  *         marker = tmp = cur
  *         cycle = [int_to_vertex[cur]]
  *         done[cur] = True             # <<<<<<<<<<<<<<
@@ -2190,7 +2196,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
  */
     (__pyx_v_done[__pyx_v_cur]) = 1;
 
-    /* "my_bliss.pyx":108
+    /* "my_bliss.pyx":109
  *         done[cur] = True
  * 
  *         while aut[tmp] != marker:             # <<<<<<<<<<<<<<
@@ -2201,7 +2207,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
       __pyx_t_10 = (((__pyx_v_aut[__pyx_v_tmp]) != __pyx_v_marker) != 0);
       if (!__pyx_t_10) break;
 
-      /* "my_bliss.pyx":109
+      /* "my_bliss.pyx":110
  * 
  *         while aut[tmp] != marker:
  *             tmp = aut[tmp]             # <<<<<<<<<<<<<<
@@ -2210,7 +2216,7 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
  */
       __pyx_v_tmp = (__pyx_v_aut[__pyx_v_tmp]);
 
-      /* "my_bliss.pyx":110
+      /* "my_bliss.pyx":111
  *         while aut[tmp] != marker:
  *             tmp = aut[tmp]
  *             done[tmp] = True             # <<<<<<<<<<<<<<
@@ -2219,43 +2225,43 @@ static void __pyx_f_8my_bliss_add_gen(void *__pyx_v_user_param, unsigned int __p
  */
       (__pyx_v_done[__pyx_v_tmp]) = 1;
 
-      /* "my_bliss.pyx":111
+      /* "my_bliss.pyx":112
  *             tmp = aut[tmp]
  *             done[tmp] = True
  *             cycle.append(int_to_vertex[tmp])             # <<<<<<<<<<<<<<
  * 
  *         perm.append(tuple(cycle))
  */
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+    /* "my_bliss.pyx":114
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-    __pyx_t_7 = PyList_AsTuple(__pyx_v_cycle); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 113, __pyx_L1_error)
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-  /* "my_bliss.pyx":114
+  /* "my_bliss.pyx":115
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  *         perm.append(tuple(cycle))
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-  __pyx_t_12 = __Pyx_PyObject_Append(__pyx_v_gens, __pyx_v_perm); if (unlikely(__pyx_t_12 == ((int)-1))) __PYX_ERR(0, 114, __pyx_L1_error)
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-  /* "my_bliss.pyx":116
+  /* "my_bliss.pyx":117
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-  /* "my_bliss.pyx":69
+  /* "my_bliss.pyx":70
  *         unsigned int get_hash()
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-/* "my_bliss.pyx":118
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-  /* "my_bliss.pyx":119
+  /* "my_bliss.pyx":120
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   goto __pyx_L0;
 
-  /* "my_bliss.pyx":118
+  /* "my_bliss.pyx":119
  *     sig_free(done)
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  * cdef void empty_hook(void *user_param , unsigned int n, const unsigned int *aut):             # <<<<<<<<<<<<<<
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-/* "my_bliss.pyx":125
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@@ -2367,10 +2373,10 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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-  /* "my_bliss.pyx":155
+  /* "my_bliss.pyx":156
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@@ -2379,7 +2385,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
  */
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-  /* "my_bliss.pyx":161
+  /* "my_bliss.pyx":162
  *     cdef int x,y, lab
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@@ -2389,7 +2395,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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-    /* "my_bliss.pyx":162
+    /* "my_bliss.pyx":163
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@@ -2398,7 +2404,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
  */
     __pyx_v_g = new bliss::Graph(__pyx_v_Vnr);
 
-    /* "my_bliss.pyx":163
+    /* "my_bliss.pyx":164
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-      /* "my_bliss.pyx":164
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-      /* "my_bliss.pyx":163
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@@ -2430,7 +2436,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
  */
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-    /* "my_bliss.pyx":161
+    /* "my_bliss.pyx":162
  *     cdef int x,y, lab
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@@ -2440,7 +2446,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
     goto __pyx_L3;
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-  /* "my_bliss.pyx":166
+  /* "my_bliss.pyx":167
  *             raise MemoryError("allocation failed")
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@@ -2468,14 +2474,14 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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+    /* "my_bliss.pyx":168
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@@ -2484,7 +2490,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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-    /* "my_bliss.pyx":168
+    /* "my_bliss.pyx":169
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@@ -2494,20 +2500,20 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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-      /* "my_bliss.pyx":169
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-      /* "my_bliss.pyx":168
+      /* "my_bliss.pyx":169
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@@ -2516,7 +2522,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
  */
     }
 
-    /* "my_bliss.pyx":170
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@@ -2528,7 +2534,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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-      /* "my_bliss.pyx":171
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@@ -2540,7 +2546,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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-        /* "my_bliss.pyx":172
+        /* "my_bliss.pyx":173
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@@ -2553,17 +2559,17 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
   }
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-  /* "my_bliss.pyx":174
+  /* "my_bliss.pyx":175
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-  __pyx_t_6 = PyObject_Length(__pyx_v_Vout); if (unlikely(__pyx_t_6 == ((Py_ssize_t)-1))) __PYX_ERR(0, 174, __pyx_L1_error)
+  __pyx_t_6 = PyObject_Length(__pyx_v_Vout); if (unlikely(__pyx_t_6 == ((Py_ssize_t)-1))) __PYX_ERR(0, 175, __pyx_L1_error)
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-  /* "my_bliss.pyx":176
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@@ -2575,33 +2581,33 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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-    /* "my_bliss.pyx":177
+    /* "my_bliss.pyx":178
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+    __pyx_t_2 = __Pyx_GetItemInt(__pyx_v_Vin, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 179, __pyx_L1_error)
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-    /* "my_bliss.pyx":179
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@@ -2611,7 +2617,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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-      /* "my_bliss.pyx":180
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@@ -2620,7 +2626,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
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-      /* "my_bliss.pyx":179
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       goto __pyx_L12;
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+      __pyx_t_2 = __Pyx_GetItemInt(__pyx_v_labels, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 183, __pyx_L1_error)
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+      __pyx_t_12 = __Pyx_PyInt_As_int(__pyx_t_2); if (unlikely((__pyx_t_12 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 183, __pyx_L1_error)
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       __pyx_v_lab = __pyx_t_12;
     }
     __pyx_L12:;
 
-    /* "my_bliss.pyx":184
+    /* "my_bliss.pyx":185
  *             lab = labels[i]
  * 
  *         if lab:             # <<<<<<<<<<<<<<
@@ -2656,7 +2662,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
     __pyx_t_1 = (__pyx_v_lab != 0);
     if (__pyx_t_1) {
 
-      /* "my_bliss.pyx":185
+      /* "my_bliss.pyx":186
  * 
  *         if lab:
  *             lab += 1             # <<<<<<<<<<<<<<
@@ -2665,7 +2671,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
  */
       __pyx_v_lab = (__pyx_v_lab + 1);
 
-      /* "my_bliss.pyx":186
+      /* "my_bliss.pyx":187
  *         if lab:
  *             lab += 1
  *             for j in range(logLnr - 1, -1, -1):             # <<<<<<<<<<<<<<
@@ -2675,7 +2681,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
       for (__pyx_t_9 = (__pyx_v_logLnr - 1); __pyx_t_9 > -1L; __pyx_t_9-=1) {
         __pyx_v_j = __pyx_t_9;
 
-        /* "my_bliss.pyx":187
+        /* "my_bliss.pyx":188
  *             lab += 1
  *             for j in range(logLnr - 1, -1, -1):
  *                 if lab & (1 << j):             # <<<<<<<<<<<<<<
@@ -2685,7 +2691,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
         __pyx_t_1 = ((__pyx_v_lab & (1 << __pyx_v_j)) != 0);
         if (__pyx_t_1) {
 
-          /* "my_bliss.pyx":188
+          /* "my_bliss.pyx":189
  *             for j in range(logLnr - 1, -1, -1):
  *                 if lab & (1 << j):
  *                     g.add_edge(j * Vnr + x, j * Vnr + y)             # <<<<<<<<<<<<<<
@@ -2694,7 +2700,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
  */
           __pyx_v_g->add_edge(((__pyx_v_j * __pyx_v_Vnr) + __pyx_v_x), ((__pyx_v_j * __pyx_v_Vnr) + __pyx_v_y));
 
-          /* "my_bliss.pyx":187
+          /* "my_bliss.pyx":188
  *             lab += 1
  *             for j in range(logLnr - 1, -1, -1):
  *                 if lab & (1 << j):             # <<<<<<<<<<<<<<
@@ -2704,7 +2710,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
         }
       }
 
-      /* "my_bliss.pyx":184
+      /* "my_bliss.pyx":185
  *             lab = labels[i]
  * 
  *         if lab:             # <<<<<<<<<<<<<<
@@ -2714,7 +2720,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
       goto __pyx_L13;
     }
 
-    /* "my_bliss.pyx":190
+    /* "my_bliss.pyx":191
  *                     g.add_edge(j * Vnr + x, j * Vnr + y)
  *         else:
  *             g.add_edge(x, y)             # <<<<<<<<<<<<<<
@@ -2727,33 +2733,33 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
     __pyx_L13:;
   }
 
-  /* "my_bliss.pyx":192
+  /* "my_bliss.pyx":193
  *             g.add_edge(x, y)
  * 
  *     if not bool(partition):             # <<<<<<<<<<<<<<
  *         partition = [list(range(Vnr))]
  *     cdef int Pnr = len(partition)
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-  __pyx_t_1 = __Pyx_PyObject_IsTrue(__pyx_v_partition); if (unlikely(__pyx_t_1 < 0)) __PYX_ERR(0, 192, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyObject_IsTrue(__pyx_v_partition); if (unlikely(__pyx_t_1 < 0)) __PYX_ERR(0, 193, __pyx_L1_error)
   __pyx_t_13 = ((!((!(!__pyx_t_1)) != 0)) != 0);
   if (__pyx_t_13) {
 
-    /* "my_bliss.pyx":193
+    /* "my_bliss.pyx":194
  * 
  *     if not bool(partition):
  *         partition = [list(range(Vnr))]             # <<<<<<<<<<<<<<
  *     cdef int Pnr = len(partition)
  *     for i in range(Pnr):
  */
-    __pyx_t_2 = __Pyx_PyInt_From_int(__pyx_v_Vnr); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 193, __pyx_L1_error)
+    __pyx_t_2 = __Pyx_PyInt_From_int(__pyx_v_Vnr); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 194, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
-    __pyx_t_4 = __Pyx_PyObject_CallOneArg(__pyx_builtin_range, __pyx_t_2); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 193, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_CallOneArg(__pyx_builtin_range, __pyx_t_2); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 194, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_4);
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-    __pyx_t_2 = PySequence_List(__pyx_t_4); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 193, __pyx_L1_error)
+    __pyx_t_2 = PySequence_List(__pyx_t_4); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 194, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
     __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
-    __pyx_t_4 = PyList_New(1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 193, __pyx_L1_error)
+    __pyx_t_4 = PyList_New(1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 194, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_4);
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@@ -2761,7 +2767,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
     __Pyx_DECREF_SET(__pyx_v_partition, __pyx_t_4);
     __pyx_t_4 = 0;
 
-    /* "my_bliss.pyx":192
+    /* "my_bliss.pyx":193
  *             g.add_edge(x, y)
  * 
  *     if not bool(partition):             # <<<<<<<<<<<<<<
@@ -2770,17 +2776,17 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
  */
   }
 
-  /* "my_bliss.pyx":194
+  /* "my_bliss.pyx":195
  *     if not bool(partition):
  *         partition = [list(range(Vnr))]
  *     cdef int Pnr = len(partition)             # <<<<<<<<<<<<<<
  *     for i in range(Pnr):
  *         for v in partition[i]:
  */
-  __pyx_t_6 = PyObject_Length(__pyx_v_partition); if (unlikely(__pyx_t_6 == ((Py_ssize_t)-1))) __PYX_ERR(0, 194, __pyx_L1_error)
+  __pyx_t_6 = PyObject_Length(__pyx_v_partition); if (unlikely(__pyx_t_6 == ((Py_ssize_t)-1))) __PYX_ERR(0, 195, __pyx_L1_error)
   __pyx_v_Pnr = __pyx_t_6;
 
-  /* "my_bliss.pyx":195
+  /* "my_bliss.pyx":196
  *         partition = [list(range(Vnr))]
  *     cdef int Pnr = len(partition)
  *     for i in range(Pnr):             # <<<<<<<<<<<<<<
@@ -2792,22 +2798,22 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
   for (__pyx_t_6 = 0; __pyx_t_6 < __pyx_t_8; __pyx_t_6+=1) {
     __pyx_v_i = __pyx_t_6;
 
-    /* "my_bliss.pyx":196
+    /* "my_bliss.pyx":197
  *     cdef int Pnr = len(partition)
  *     for i in range(Pnr):
  *         for v in partition[i]:             # <<<<<<<<<<<<<<
  *             if Lnr == 1:
  *                 g.change_color(v, i)
  */
-    __pyx_t_4 = __Pyx_GetItemInt(__pyx_v_partition, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 196, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_GetItemInt(__pyx_v_partition, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 197, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_4);
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       __pyx_t_14 = NULL;
     } else {
-      __pyx_t_9 = -1; __pyx_t_2 = PyObject_GetIter(__pyx_t_4); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 196, __pyx_L1_error)
+      __pyx_t_9 = -1; __pyx_t_2 = PyObject_GetIter(__pyx_t_4); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 197, __pyx_L1_error)
       __Pyx_GOTREF(__pyx_t_2);
-      __pyx_t_14 = Py_TYPE(__pyx_t_2)->tp_iternext; if (unlikely(!__pyx_t_14)) __PYX_ERR(0, 196, __pyx_L1_error)
+      __pyx_t_14 = Py_TYPE(__pyx_t_2)->tp_iternext; if (unlikely(!__pyx_t_14)) __PYX_ERR(0, 197, __pyx_L1_error)
     }
     __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
     for (;;) {
@@ -2815,17 +2821,17 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
         if (likely(PyList_CheckExact(__pyx_t_2))) {
           if (__pyx_t_9 >= PyList_GET_SIZE(__pyx_t_2)) break;
           #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
-          __pyx_t_4 = PyList_GET_ITEM(__pyx_t_2, __pyx_t_9); __Pyx_INCREF(__pyx_t_4); __pyx_t_9++; if (unlikely(0 < 0)) __PYX_ERR(0, 196, __pyx_L1_error)
+          __pyx_t_4 = PyList_GET_ITEM(__pyx_t_2, __pyx_t_9); __Pyx_INCREF(__pyx_t_4); __pyx_t_9++; if (unlikely(0 < 0)) __PYX_ERR(0, 197, __pyx_L1_error)
           #else
-          __pyx_t_4 = PySequence_ITEM(__pyx_t_2, __pyx_t_9); __pyx_t_9++; if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 196, __pyx_L1_error)
+          __pyx_t_4 = PySequence_ITEM(__pyx_t_2, __pyx_t_9); __pyx_t_9++; if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 197, __pyx_L1_error)
           __Pyx_GOTREF(__pyx_t_4);
           #endif
         } else {
           if (__pyx_t_9 >= PyTuple_GET_SIZE(__pyx_t_2)) break;
           #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
-          __pyx_t_4 = PyTuple_GET_ITEM(__pyx_t_2, __pyx_t_9); __Pyx_INCREF(__pyx_t_4); __pyx_t_9++; if (unlikely(0 < 0)) __PYX_ERR(0, 196, __pyx_L1_error)
+          __pyx_t_4 = PyTuple_GET_ITEM(__pyx_t_2, __pyx_t_9); __Pyx_INCREF(__pyx_t_4); __pyx_t_9++; if (unlikely(0 < 0)) __PYX_ERR(0, 197, __pyx_L1_error)
           #else
-          __pyx_t_4 = PySequence_ITEM(__pyx_t_2, __pyx_t_9); __pyx_t_9++; if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 196, __pyx_L1_error)
+          __pyx_t_4 = PySequence_ITEM(__pyx_t_2, __pyx_t_9); __pyx_t_9++; if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 197, __pyx_L1_error)
           __Pyx_GOTREF(__pyx_t_4);
           #endif
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@@ -2835,7 +2841,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
           PyObject* exc_type = PyErr_Occurred();
           if (exc_type) {
             if (likely(__Pyx_PyErr_GivenExceptionMatches(exc_type, PyExc_StopIteration))) PyErr_Clear();
-            else __PYX_ERR(0, 196, __pyx_L1_error)
+            else __PYX_ERR(0, 197, __pyx_L1_error)
           }
           break;
         }
@@ -2844,7 +2850,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
       __Pyx_XDECREF_SET(__pyx_v_v, __pyx_t_4);
       __pyx_t_4 = 0;
 
-      /* "my_bliss.pyx":197
+      /* "my_bliss.pyx":198
  *     for i in range(Pnr):
  *         for v in partition[i]:
  *             if Lnr == 1:             # <<<<<<<<<<<<<<
@@ -2854,17 +2860,17 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
       __pyx_t_13 = ((__pyx_v_Lnr == 1) != 0);
       if (__pyx_t_13) {
 
-        /* "my_bliss.pyx":198
+        /* "my_bliss.pyx":199
  *         for v in partition[i]:
  *             if Lnr == 1:
  *                 g.change_color(v, i)             # <<<<<<<<<<<<<<
  *             else:
  *                 for j in range(logLnr):
  */
-        __pyx_t_15 = __Pyx_PyInt_As_unsigned_int(__pyx_v_v); if (unlikely((__pyx_t_15 == (unsigned int)-1) && PyErr_Occurred())) __PYX_ERR(0, 198, __pyx_L1_error)
+        __pyx_t_15 = __Pyx_PyInt_As_unsigned_int(__pyx_v_v); if (unlikely((__pyx_t_15 == (unsigned int)-1) && PyErr_Occurred())) __PYX_ERR(0, 199, __pyx_L1_error)
         __pyx_v_g->change_color(__pyx_t_15, __pyx_v_i);
 
-        /* "my_bliss.pyx":197
+        /* "my_bliss.pyx":198
  *     for i in range(Pnr):
  *         for v in partition[i]:
  *             if Lnr == 1:             # <<<<<<<<<<<<<<
@@ -2874,7 +2880,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
         goto __pyx_L22;
       }
 
-      /* "my_bliss.pyx":200
+      /* "my_bliss.pyx":201
  *                 g.change_color(v, i)
  *             else:
  *                 for j in range(logLnr):             # <<<<<<<<<<<<<<
@@ -2887,26 +2893,26 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
         for (__pyx_t_10 = 0; __pyx_t_10 < __pyx_t_16; __pyx_t_10+=1) {
           __pyx_v_j = __pyx_t_10;
 
-          /* "my_bliss.pyx":201
+          /* "my_bliss.pyx":202
  *             else:
  *                 for j in range(logLnr):
  *                     g.change_color(j * Vnr + v, j * Pnr + i)             # <<<<<<<<<<<<<<
  *     return g
  * 
  */
-          __pyx_t_4 = PyInt_FromSsize_t((__pyx_v_j * __pyx_v_Vnr)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 201, __pyx_L1_error)
+          __pyx_t_4 = PyInt_FromSsize_t((__pyx_v_j * __pyx_v_Vnr)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 202, __pyx_L1_error)
           __Pyx_GOTREF(__pyx_t_4);
-          __pyx_t_3 = PyNumber_Add(__pyx_t_4, __pyx_v_v); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 201, __pyx_L1_error)
+          __pyx_t_3 = PyNumber_Add(__pyx_t_4, __pyx_v_v); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 202, __pyx_L1_error)
           __Pyx_GOTREF(__pyx_t_3);
           __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
-          __pyx_t_15 = __Pyx_PyInt_As_unsigned_int(__pyx_t_3); if (unlikely((__pyx_t_15 == (unsigned int)-1) && PyErr_Occurred())) __PYX_ERR(0, 201, __pyx_L1_error)
+          __pyx_t_15 = __Pyx_PyInt_As_unsigned_int(__pyx_t_3); if (unlikely((__pyx_t_15 == (unsigned int)-1) && PyErr_Occurred())) __PYX_ERR(0, 202, __pyx_L1_error)
           __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
           __pyx_v_g->change_color(__pyx_t_15, ((__pyx_v_j * __pyx_v_Pnr) + __pyx_v_i));
         }
       }
       __pyx_L22:;
 
-      /* "my_bliss.pyx":196
+      /* "my_bliss.pyx":197
  *     cdef int Pnr = len(partition)
  *     for i in range(Pnr):
  *         for v in partition[i]:             # <<<<<<<<<<<<<<
@@ -2917,7 +2923,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
   }
 
-  /* "my_bliss.pyx":202
+  /* "my_bliss.pyx":203
  *                 for j in range(logLnr):
  *                     g.change_color(j * Vnr + v, j * Pnr + i)
  *     return g             # <<<<<<<<<<<<<<
@@ -2927,7 +2933,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
   __pyx_r = __pyx_v_g;
   goto __pyx_L0;
 
-  /* "my_bliss.pyx":125
+  /* "my_bliss.pyx":126
  * #####################################################
  * 
  * cdef Graph *bliss_graph_from_labelled_edges(int Vnr, int Lnr, Vout, Vin, labels, partition):             # <<<<<<<<<<<<<<
@@ -2951,7 +2957,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph_from_labelled_edges(int __pyx
   return __pyx_r;
 }
 
-/* "my_bliss.pyx":204
+/* "my_bliss.pyx":205
  *     return g
  * 
  * cdef Digraph *bliss_digraph_from_labelled_edges(int Vnr, int Lnr, Vout, Vin, labels, partition):             # <<<<<<<<<<<<<<
@@ -2992,10 +2998,10 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
   unsigned int __pyx_t_17;
   unsigned int __pyx_t_18;
   __Pyx_RefNannySetupContext("bliss_digraph_from_labelled_edges", 0);
-  __Pyx_TraceCall("bliss_digraph_from_labelled_edges", __pyx_f[0], 204, 0, __PYX_ERR(0, 204, __pyx_L1_error));
+  __Pyx_TraceCall("bliss_digraph_from_labelled_edges", __pyx_f[0], 205, 0, __PYX_ERR(0, 205, __pyx_L1_error));
   __Pyx_INCREF(__pyx_v_partition);
 
-  /* "my_bliss.pyx":234
+  /* "my_bliss.pyx":235
  *     """
  *     cdef Py_ssize_t i, j
  *     cdef int logLnr = 0             # <<<<<<<<<<<<<<
@@ -3004,7 +3010,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  */
   __pyx_v_logLnr = 0;
 
-  /* "my_bliss.pyx":240
+  /* "my_bliss.pyx":241
  *     cdef int x, y, lab
  * 
  *     if Lnr == 1:             # <<<<<<<<<<<<<<
@@ -3014,7 +3020,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
   __pyx_t_1 = ((__pyx_v_Lnr == 1) != 0);
   if (__pyx_t_1) {
 
-    /* "my_bliss.pyx":241
+    /* "my_bliss.pyx":242
  * 
  *     if Lnr == 1:
  *         g = new Digraph(Vnr)             # <<<<<<<<<<<<<<
@@ -3023,7 +3029,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  */
     __pyx_v_g = new bliss::Digraph(__pyx_v_Vnr);
 
-    /* "my_bliss.pyx":242
+    /* "my_bliss.pyx":243
  *     if Lnr == 1:
  *         g = new Digraph(Vnr)
  *         if not g:             # <<<<<<<<<<<<<<
@@ -3033,20 +3039,20 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     __pyx_t_1 = ((!(__pyx_v_g != 0)) != 0);
     if (unlikely(__pyx_t_1)) {
 
-      /* "my_bliss.pyx":243
+      /* "my_bliss.pyx":244
  *         g = new Digraph(Vnr)
  *         if not g:
  *             raise MemoryError("allocation failed")             # <<<<<<<<<<<<<<
  *     else:
  *         logLnr = len(numpy.binary_repr(Lnr))
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-      __pyx_t_2 = __Pyx_PyObject_Call(__pyx_builtin_MemoryError, __pyx_tuple_, NULL); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 243, __pyx_L1_error)
+      __pyx_t_2 = __Pyx_PyObject_Call(__pyx_builtin_MemoryError, __pyx_tuple_, NULL); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 244, __pyx_L1_error)
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       __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-      __PYX_ERR(0, 243, __pyx_L1_error)
+      __PYX_ERR(0, 244, __pyx_L1_error)
 
-      /* "my_bliss.pyx":242
+      /* "my_bliss.pyx":243
  *     if Lnr == 1:
  *         g = new Digraph(Vnr)
  *         if not g:             # <<<<<<<<<<<<<<
@@ -3055,7 +3061,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  */
     }
 
-    /* "my_bliss.pyx":240
+    /* "my_bliss.pyx":241
  *     cdef int x, y, lab
  * 
  *     if Lnr == 1:             # <<<<<<<<<<<<<<
@@ -3065,7 +3071,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     goto __pyx_L3;
   }
 
-  /* "my_bliss.pyx":245
+  /* "my_bliss.pyx":246
  *             raise MemoryError("allocation failed")
  *     else:
  *         logLnr = len(numpy.binary_repr(Lnr))             # <<<<<<<<<<<<<<
@@ -3073,12 +3079,12 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  *         if not g:
  */
   /*else*/ {
-    __Pyx_GetModuleGlobalName(__pyx_t_3, __pyx_n_s_numpy); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 245, __pyx_L1_error)
+    __Pyx_GetModuleGlobalName(__pyx_t_3, __pyx_n_s_numpy); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 246, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_3);
-    __pyx_t_4 = __Pyx_PyObject_GetAttrStr(__pyx_t_3, __pyx_n_s_binary_repr); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 245, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_GetAttrStr(__pyx_t_3, __pyx_n_s_binary_repr); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 246, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_4);
     __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-    __pyx_t_3 = __Pyx_PyInt_From_int(__pyx_v_Lnr); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 245, __pyx_L1_error)
+    __pyx_t_3 = __Pyx_PyInt_From_int(__pyx_v_Lnr); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 246, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_3);
     __pyx_t_5 = NULL;
     if (CYTHON_UNPACK_METHODS && unlikely(PyMethod_Check(__pyx_t_4))) {
@@ -3093,14 +3099,14 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     __pyx_t_2 = (__pyx_t_5) ? __Pyx_PyObject_Call2Args(__pyx_t_4, __pyx_t_5, __pyx_t_3) : __Pyx_PyObject_CallOneArg(__pyx_t_4, __pyx_t_3);
     __Pyx_XDECREF(__pyx_t_5); __pyx_t_5 = 0;
     __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-    if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 245, __pyx_L1_error)
+    if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 246, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
     __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
-    __pyx_t_6 = PyObject_Length(__pyx_t_2); if (unlikely(__pyx_t_6 == ((Py_ssize_t)-1))) __PYX_ERR(0, 245, __pyx_L1_error)
+    __pyx_t_6 = PyObject_Length(__pyx_t_2); if (unlikely(__pyx_t_6 == ((Py_ssize_t)-1))) __PYX_ERR(0, 246, __pyx_L1_error)
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
     __pyx_v_logLnr = __pyx_t_6;
 
-    /* "my_bliss.pyx":246
+    /* "my_bliss.pyx":247
  *     else:
  *         logLnr = len(numpy.binary_repr(Lnr))
  *         g = new Digraph(Vnr * logLnr)             # <<<<<<<<<<<<<<
@@ -3109,7 +3115,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  */
     __pyx_v_g = new bliss::Digraph((__pyx_v_Vnr * __pyx_v_logLnr));
 
-    /* "my_bliss.pyx":247
+    /* "my_bliss.pyx":248
  *         logLnr = len(numpy.binary_repr(Lnr))
  *         g = new Digraph(Vnr * logLnr)
  *         if not g:             # <<<<<<<<<<<<<<
@@ -3119,20 +3125,20 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     __pyx_t_1 = ((!(__pyx_v_g != 0)) != 0);
     if (unlikely(__pyx_t_1)) {
 
-      /* "my_bliss.pyx":248
+      /* "my_bliss.pyx":249
  *         g = new Digraph(Vnr * logLnr)
  *         if not g:
  *             raise MemoryError("allocation failed")             # <<<<<<<<<<<<<<
  *         for j in range(1, logLnr):
  *             for i in range((j - 1) * Vnr, j * Vnr):
  */
-      __pyx_t_2 = __Pyx_PyObject_Call(__pyx_builtin_MemoryError, __pyx_tuple_, NULL); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 248, __pyx_L1_error)
+      __pyx_t_2 = __Pyx_PyObject_Call(__pyx_builtin_MemoryError, __pyx_tuple_, NULL); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 249, __pyx_L1_error)
       __Pyx_GOTREF(__pyx_t_2);
       __Pyx_Raise(__pyx_t_2, 0, 0, 0);
       __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-      __PYX_ERR(0, 248, __pyx_L1_error)
+      __PYX_ERR(0, 249, __pyx_L1_error)
 
-      /* "my_bliss.pyx":247
+      /* "my_bliss.pyx":248
  *         logLnr = len(numpy.binary_repr(Lnr))
  *         g = new Digraph(Vnr * logLnr)
  *         if not g:             # <<<<<<<<<<<<<<
@@ -3141,7 +3147,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  */
     }
 
-    /* "my_bliss.pyx":249
+    /* "my_bliss.pyx":250
  *         if not g:
  *             raise MemoryError("allocation failed")
  *         for j in range(1, logLnr):             # <<<<<<<<<<<<<<
@@ -3153,7 +3159,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     for (__pyx_t_6 = 1; __pyx_t_6 < __pyx_t_8; __pyx_t_6+=1) {
       __pyx_v_j = __pyx_t_6;
 
-      /* "my_bliss.pyx":250
+      /* "my_bliss.pyx":251
  *             raise MemoryError("allocation failed")
  *         for j in range(1, logLnr):
  *             for i in range((j - 1) * Vnr, j * Vnr):             # <<<<<<<<<<<<<<
@@ -3165,7 +3171,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
       for (__pyx_t_11 = ((__pyx_v_j - 1) * __pyx_v_Vnr); __pyx_t_11 < __pyx_t_10; __pyx_t_11+=1) {
         __pyx_v_i = __pyx_t_11;
 
-        /* "my_bliss.pyx":251
+        /* "my_bliss.pyx":252
  *         for j in range(1, logLnr):
  *             for i in range((j - 1) * Vnr, j * Vnr):
  *                 g.add_edge(i, i + Vnr)             # <<<<<<<<<<<<<<
@@ -3178,17 +3184,17 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
   }
   __pyx_L3:;
 
-  /* "my_bliss.pyx":253
+  /* "my_bliss.pyx":254
  *                 g.add_edge(i, i + Vnr)
  * 
  *     cdef int Enr = len(Vout)             # <<<<<<<<<<<<<<
  * 
  *     for i in range(Enr):
  */
-  __pyx_t_6 = PyObject_Length(__pyx_v_Vout); if (unlikely(__pyx_t_6 == ((Py_ssize_t)-1))) __PYX_ERR(0, 253, __pyx_L1_error)
+  __pyx_t_6 = PyObject_Length(__pyx_v_Vout); if (unlikely(__pyx_t_6 == ((Py_ssize_t)-1))) __PYX_ERR(0, 254, __pyx_L1_error)
   __pyx_v_Enr = __pyx_t_6;
 
-  /* "my_bliss.pyx":255
+  /* "my_bliss.pyx":256
  *     cdef int Enr = len(Vout)
  * 
  *     for i in range(Enr):             # <<<<<<<<<<<<<<
@@ -3200,33 +3206,33 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
   for (__pyx_t_6 = 0; __pyx_t_6 < __pyx_t_8; __pyx_t_6+=1) {
     __pyx_v_i = __pyx_t_6;
 
-    /* "my_bliss.pyx":256
+    /* "my_bliss.pyx":257
  * 
  *     for i in range(Enr):
  *         x = Vout[i]             # <<<<<<<<<<<<<<
  *         y = Vin[i]
  *         if Lnr == 1:
  */
-    __pyx_t_2 = __Pyx_GetItemInt(__pyx_v_Vout, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 256, __pyx_L1_error)
+    __pyx_t_2 = __Pyx_GetItemInt(__pyx_v_Vout, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 257, __pyx_L1_error)
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-    __pyx_t_12 = __Pyx_PyInt_As_int(__pyx_t_2); if (unlikely((__pyx_t_12 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 256, __pyx_L1_error)
+    __pyx_t_12 = __Pyx_PyInt_As_int(__pyx_t_2); if (unlikely((__pyx_t_12 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 257, __pyx_L1_error)
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-    /* "my_bliss.pyx":257
+    /* "my_bliss.pyx":258
  *     for i in range(Enr):
  *         x = Vout[i]
  *         y = Vin[i]             # <<<<<<<<<<<<<<
  *         if Lnr == 1:
  *             lab = 0
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-    __pyx_t_2 = __Pyx_GetItemInt(__pyx_v_Vin, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 257, __pyx_L1_error)
+    __pyx_t_2 = __Pyx_GetItemInt(__pyx_v_Vin, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 258, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
-    __pyx_t_12 = __Pyx_PyInt_As_int(__pyx_t_2); if (unlikely((__pyx_t_12 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 257, __pyx_L1_error)
+    __pyx_t_12 = __Pyx_PyInt_As_int(__pyx_t_2); if (unlikely((__pyx_t_12 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 258, __pyx_L1_error)
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
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-    /* "my_bliss.pyx":258
+    /* "my_bliss.pyx":259
  *         x = Vout[i]
  *         y = Vin[i]
  *         if Lnr == 1:             # <<<<<<<<<<<<<<
@@ -3236,7 +3242,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     __pyx_t_1 = ((__pyx_v_Lnr == 1) != 0);
     if (__pyx_t_1) {
 
-      /* "my_bliss.pyx":259
+      /* "my_bliss.pyx":260
  *         y = Vin[i]
  *         if Lnr == 1:
  *             lab = 0             # <<<<<<<<<<<<<<
@@ -3245,7 +3251,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  */
       __pyx_v_lab = 0;
 
-      /* "my_bliss.pyx":258
+      /* "my_bliss.pyx":259
  *         x = Vout[i]
  *         y = Vin[i]
  *         if Lnr == 1:             # <<<<<<<<<<<<<<
@@ -3255,7 +3261,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
       goto __pyx_L12;
     }
 
-    /* "my_bliss.pyx":261
+    /* "my_bliss.pyx":262
  *             lab = 0
  *         else:
  *             lab = labels[i]             # <<<<<<<<<<<<<<
@@ -3263,15 +3269,15 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  *         if lab:
  */
     /*else*/ {
-      __pyx_t_2 = __Pyx_GetItemInt(__pyx_v_labels, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 261, __pyx_L1_error)
+      __pyx_t_2 = __Pyx_GetItemInt(__pyx_v_labels, __pyx_v_i, Py_ssize_t, 1, PyInt_FromSsize_t, 0, 1, 1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 262, __pyx_L1_error)
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-      __pyx_t_12 = __Pyx_PyInt_As_int(__pyx_t_2); if (unlikely((__pyx_t_12 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 261, __pyx_L1_error)
+      __pyx_t_12 = __Pyx_PyInt_As_int(__pyx_t_2); if (unlikely((__pyx_t_12 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 262, __pyx_L1_error)
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     __pyx_L12:;
 
-    /* "my_bliss.pyx":263
+    /* "my_bliss.pyx":264
  *             lab = labels[i]
  * 
  *         if lab:             # <<<<<<<<<<<<<<
@@ -3281,7 +3287,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     __pyx_t_1 = (__pyx_v_lab != 0);
     if (__pyx_t_1) {
 
-      /* "my_bliss.pyx":264
+      /* "my_bliss.pyx":265
  * 
  *         if lab:
  *             lab += 1             # <<<<<<<<<<<<<<
@@ -3290,7 +3296,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  */
       __pyx_v_lab = (__pyx_v_lab + 1);
 
-      /* "my_bliss.pyx":265
+      /* "my_bliss.pyx":266
  *         if lab:
  *             lab += 1
  *             for j in range(logLnr - 1, -1, -1):             # <<<<<<<<<<<<<<
@@ -3300,7 +3306,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
       for (__pyx_t_9 = (__pyx_v_logLnr - 1); __pyx_t_9 > -1L; __pyx_t_9-=1) {
         __pyx_v_j = __pyx_t_9;
 
-        /* "my_bliss.pyx":266
+        /* "my_bliss.pyx":267
  *             lab += 1
  *             for j in range(logLnr - 1, -1, -1):
  *                 if lab & (1 << j):             # <<<<<<<<<<<<<<
@@ -3310,7 +3316,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
         __pyx_t_1 = ((__pyx_v_lab & (1 << __pyx_v_j)) != 0);
         if (__pyx_t_1) {
 
-          /* "my_bliss.pyx":267
+          /* "my_bliss.pyx":268
  *             for j in range(logLnr - 1, -1, -1):
  *                 if lab & (1 << j):
  *                     g.add_edge(j * Vnr + x, j * Vnr + y)             # <<<<<<<<<<<<<<
@@ -3319,7 +3325,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  */
           __pyx_v_g->add_edge(((__pyx_v_j * __pyx_v_Vnr) + __pyx_v_x), ((__pyx_v_j * __pyx_v_Vnr) + __pyx_v_y));
 
-          /* "my_bliss.pyx":266
+          /* "my_bliss.pyx":267
  *             lab += 1
  *             for j in range(logLnr - 1, -1, -1):
  *                 if lab & (1 << j):             # <<<<<<<<<<<<<<
@@ -3329,7 +3335,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
         }
       }
 
-      /* "my_bliss.pyx":263
+      /* "my_bliss.pyx":264
  *             lab = labels[i]
  * 
  *         if lab:             # <<<<<<<<<<<<<<
@@ -3339,7 +3345,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
       goto __pyx_L13;
     }
 
-    /* "my_bliss.pyx":269
+    /* "my_bliss.pyx":270
  *                     g.add_edge(j * Vnr + x, j * Vnr + y)
  *         else:
  *             g.add_edge(x, y)             # <<<<<<<<<<<<<<
@@ -3352,33 +3358,33 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     __pyx_L13:;
   }
 
-  /* "my_bliss.pyx":271
+  /* "my_bliss.pyx":272
  *             g.add_edge(x, y)
  * 
  *     if not bool(partition):             # <<<<<<<<<<<<<<
  *         partition = [list(range(Vnr))]
  *     cdef Pnr = len(partition)
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-  __pyx_t_1 = __Pyx_PyObject_IsTrue(__pyx_v_partition); if (unlikely(__pyx_t_1 < 0)) __PYX_ERR(0, 271, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyObject_IsTrue(__pyx_v_partition); if (unlikely(__pyx_t_1 < 0)) __PYX_ERR(0, 272, __pyx_L1_error)
   __pyx_t_13 = ((!((!(!__pyx_t_1)) != 0)) != 0);
   if (__pyx_t_13) {
 
-    /* "my_bliss.pyx":272
+    /* "my_bliss.pyx":273
  * 
  *     if not bool(partition):
  *         partition = [list(range(Vnr))]             # <<<<<<<<<<<<<<
  *     cdef Pnr = len(partition)
  *     for i in range(Pnr):
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-    __pyx_t_2 = __Pyx_PyInt_From_int(__pyx_v_Vnr); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 272, __pyx_L1_error)
+    __pyx_t_2 = __Pyx_PyInt_From_int(__pyx_v_Vnr); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 273, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
-    __pyx_t_4 = __Pyx_PyObject_CallOneArg(__pyx_builtin_range, __pyx_t_2); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 272, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_CallOneArg(__pyx_builtin_range, __pyx_t_2); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 273, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_4);
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-    __pyx_t_2 = PySequence_List(__pyx_t_4); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 272, __pyx_L1_error)
+    __pyx_t_2 = PySequence_List(__pyx_t_4); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 273, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
     __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
-    __pyx_t_4 = PyList_New(1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 272, __pyx_L1_error)
+    __pyx_t_4 = PyList_New(1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 273, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_4);
     __Pyx_GIVEREF(__pyx_t_2);
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@@ -3386,7 +3392,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     __Pyx_DECREF_SET(__pyx_v_partition, __pyx_t_4);
     __pyx_t_4 = 0;
 
-    /* "my_bliss.pyx":271
+    /* "my_bliss.pyx":272
  *             g.add_edge(x, y)
  * 
  *     if not bool(partition):             # <<<<<<<<<<<<<<
@@ -3395,47 +3401,47 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
  */
   }
 
-  /* "my_bliss.pyx":273
+  /* "my_bliss.pyx":274
  *     if not bool(partition):
  *         partition = [list(range(Vnr))]
  *     cdef Pnr = len(partition)             # <<<<<<<<<<<<<<
  *     for i in range(Pnr):
  *         for v in partition[i]:
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-    /* "my_bliss.pyx":275
+    /* "my_bliss.pyx":276
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-      __pyx_t_16 = Py_TYPE(__pyx_t_2)->tp_iternext; if (unlikely(!__pyx_t_16)) __PYX_ERR(0, 275, __pyx_L1_error)
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@@ -3443,17 +3449,17 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
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+          __pyx_t_4 = PyTuple_GET_ITEM(__pyx_t_2, __pyx_t_9); __Pyx_INCREF(__pyx_t_4); __pyx_t_9++; if (unlikely(0 < 0)) __PYX_ERR(0, 276, __pyx_L1_error)
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@@ -3463,7 +3469,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
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-            else __PYX_ERR(0, 275, __pyx_L1_error)
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@@ -3472,7 +3478,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
       __Pyx_XDECREF_SET(__pyx_v_v, __pyx_t_4);
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-      /* "my_bliss.pyx":276
+      /* "my_bliss.pyx":277
  *     for i in range(Pnr):
  *         for v in partition[i]:
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@@ -3482,17 +3488,17 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
       __pyx_t_13 = ((__pyx_v_Lnr == 1) != 0);
       if (__pyx_t_13) {
 
-        /* "my_bliss.pyx":277
+        /* "my_bliss.pyx":278
  *         for v in partition[i]:
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  *                 g.change_color(v, i)             # <<<<<<<<<<<<<<
  *             else:
  *                 for j in range(logLnr):
  */
-        __pyx_t_17 = __Pyx_PyInt_As_unsigned_int(__pyx_v_v); if (unlikely((__pyx_t_17 == (unsigned int)-1) && PyErr_Occurred())) __PYX_ERR(0, 277, __pyx_L1_error)
+        __pyx_t_17 = __Pyx_PyInt_As_unsigned_int(__pyx_v_v); if (unlikely((__pyx_t_17 == (unsigned int)-1) && PyErr_Occurred())) __PYX_ERR(0, 278, __pyx_L1_error)
         __pyx_v_g->change_color(__pyx_t_17, __pyx_v_i);
 
-        /* "my_bliss.pyx":276
+        /* "my_bliss.pyx":277
  *     for i in range(Pnr):
  *         for v in partition[i]:
  *             if Lnr == 1:             # <<<<<<<<<<<<<<
@@ -3502,7 +3508,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
         goto __pyx_L22;
       }
 
-      /* "my_bliss.pyx":279
+      /* "my_bliss.pyx":280
  *                 g.change_color(v, i)
  *             else:
  *                 for j in range(logLnr):             # <<<<<<<<<<<<<<
@@ -3515,39 +3521,39 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
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           __pyx_v_j = __pyx_t_10;
 
-          /* "my_bliss.pyx":280
+          /* "my_bliss.pyx":281
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  *                     g.change_color(j * Vnr + v, j * Pnr + i)             # <<<<<<<<<<<<<<
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+          __pyx_t_3 = PyInt_FromSsize_t(__pyx_v_j); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 281, __pyx_L1_error)
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+          __pyx_t_5 = PyNumber_Add(__pyx_t_4, __pyx_t_3); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 281, __pyx_L1_error)
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       __pyx_L22:;
 
-      /* "my_bliss.pyx":275
+      /* "my_bliss.pyx":276
  *     cdef Pnr = len(partition)
  *     for i in range(Pnr):
  *         for v in partition[i]:             # <<<<<<<<<<<<<<
@@ -3558,7 +3564,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
   }
 
-  /* "my_bliss.pyx":281
+  /* "my_bliss.pyx":282
  *                 for j in range(logLnr):
  *                     g.change_color(j * Vnr + v, j * Pnr + i)
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@@ -3568,7 +3574,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
   __pyx_r = __pyx_v_g;
   goto __pyx_L0;
 
-  /* "my_bliss.pyx":204
+  /* "my_bliss.pyx":205
  *     return g
  * 
  * cdef Digraph *bliss_digraph_from_labelled_edges(int Vnr, int Lnr, Vout, Vin, labels, partition):             # <<<<<<<<<<<<<<
@@ -3593,7 +3599,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(int _
   return __pyx_r;
 }
 
-/* "my_bliss.pyx":287
+/* "my_bliss.pyx":288
  * #####################################################
  * 
  * cdef canonical_form_from_edge_list(int Vnr, list Vout, list Vin, int Lnr=1, list labels=[],             # <<<<<<<<<<<<<<
@@ -3605,7 +3611,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   int __pyx_v_Lnr = ((int)1);
   PyObject *__pyx_v_labels = __pyx_k__2;
 
-  /* "my_bliss.pyx":288
+  /* "my_bliss.pyx":289
  * 
  * cdef canonical_form_from_edge_list(int Vnr, list Vout, list Vin, int Lnr=1, list labels=[],
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@@ -3646,7 +3652,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   int __pyx_t_13;
   int __pyx_t_14;
   __Pyx_RefNannySetupContext("canonical_form_from_edge_list", 0);
-  __Pyx_TraceCall("canonical_form_from_edge_list", __pyx_f[0], 287, 0, __PYX_ERR(0, 287, __pyx_L1_error));
+  __Pyx_TraceCall("canonical_form_from_edge_list", __pyx_f[0], 288, 0, __PYX_ERR(0, 288, __pyx_L1_error));
   if (__pyx_optional_args) {
     if (__pyx_optional_args->__pyx_n > 0) {
       __pyx_v_Lnr = __pyx_optional_args->Lnr;
@@ -3665,7 +3671,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
     }
   }
 
-  /* "my_bliss.pyx":317
+  /* "my_bliss.pyx":318
  *     # We need this to convert the numbers from <unsigned int> to
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  *     assert <unsigned long>(Vnr) <= <unsigned long>LONG_MAX             # <<<<<<<<<<<<<<
@@ -3676,24 +3682,24 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
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       PyErr_SetNone(PyExc_AssertionError);
-      __PYX_ERR(0, 317, __pyx_L1_error)
+      __PYX_ERR(0, 318, __pyx_L1_error)
     }
   }
   #endif
 
-  /* "my_bliss.pyx":325
+  /* "my_bliss.pyx":326
  *     cdef dict relabel
  * 
  *     cdef list new_edges = []             # <<<<<<<<<<<<<<
  *     cdef long e, f
  * 
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 325, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 326, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_new_edges = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":328
+  /* "my_bliss.pyx":329
  *     cdef long e, f
  * 
  *     if directed:             # <<<<<<<<<<<<<<
@@ -3703,7 +3709,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   __pyx_t_2 = (__pyx_v_directed != 0);
   if (__pyx_t_2) {
 
-    /* "my_bliss.pyx":329
+    /* "my_bliss.pyx":330
  * 
  *     if directed:
  *         d = bliss_digraph_from_labelled_edges(Vnr, Lnr, Vout, Vin, labels, partition)             # <<<<<<<<<<<<<<
@@ -3712,7 +3718,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
  */
     __pyx_v_d = __pyx_f_8my_bliss_bliss_digraph_from_labelled_edges(__pyx_v_Vnr, __pyx_v_Lnr, __pyx_v_Vout, __pyx_v_Vin, __pyx_v_labels, __pyx_v_partition);
 
-    /* "my_bliss.pyx":330
+    /* "my_bliss.pyx":331
  *     if directed:
  *         d = bliss_digraph_from_labelled_edges(Vnr, Lnr, Vout, Vin, labels, partition)
  *         aut = d.canonical_form(s, empty_hook, NULL)             # <<<<<<<<<<<<<<
@@ -3721,7 +3727,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
  */
     __pyx_v_aut = __pyx_v_d->canonical_form(__pyx_v_s, __pyx_f_8my_bliss_empty_hook, NULL);
 
-    /* "my_bliss.pyx":328
+    /* "my_bliss.pyx":329
  *     cdef long e, f
  * 
  *     if directed:             # <<<<<<<<<<<<<<
@@ -3731,7 +3737,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
     goto __pyx_L3;
   }
 
-  /* "my_bliss.pyx":332
+  /* "my_bliss.pyx":333
  *         aut = d.canonical_form(s, empty_hook, NULL)
  *     else:
  *         g = bliss_graph_from_labelled_edges(Vnr, Lnr, Vout, Vin, labels, partition)             # <<<<<<<<<<<<<<
@@ -3741,7 +3747,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   /*else*/ {
     __pyx_v_g = __pyx_f_8my_bliss_bliss_graph_from_labelled_edges(__pyx_v_Vnr, __pyx_v_Lnr, __pyx_v_Vout, __pyx_v_Vin, __pyx_v_labels, __pyx_v_partition);
 
-    /* "my_bliss.pyx":333
+    /* "my_bliss.pyx":334
  *     else:
  *         g = bliss_graph_from_labelled_edges(Vnr, Lnr, Vout, Vin, labels, partition)
  *         aut = g.canonical_form(s, empty_hook, NULL)             # <<<<<<<<<<<<<<
@@ -3752,7 +3758,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   }
   __pyx_L3:;
 
-  /* "my_bliss.pyx":335
+  /* "my_bliss.pyx":336
  *         aut = g.canonical_form(s, empty_hook, NULL)
  * 
  *     for i in range(len(Vout)):             # <<<<<<<<<<<<<<
@@ -3761,14 +3767,14 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
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   if (unlikely(__pyx_v_Vout == Py_None)) {
     PyErr_SetString(PyExc_TypeError, "object of type 'NoneType' has no len()");
-    __PYX_ERR(0, 335, __pyx_L1_error)
+    __PYX_ERR(0, 336, __pyx_L1_error)
   }
-  __pyx_t_3 = PyList_GET_SIZE(__pyx_v_Vout); if (unlikely(__pyx_t_3 == ((Py_ssize_t)-1))) __PYX_ERR(0, 335, __pyx_L1_error)
+  __pyx_t_3 = PyList_GET_SIZE(__pyx_v_Vout); if (unlikely(__pyx_t_3 == ((Py_ssize_t)-1))) __PYX_ERR(0, 336, __pyx_L1_error)
   __pyx_t_4 = __pyx_t_3;
   for (__pyx_t_5 = 0; __pyx_t_5 < __pyx_t_4; __pyx_t_5+=1) {
     __pyx_v_i = __pyx_t_5;
 
-    /* "my_bliss.pyx":336
+    /* "my_bliss.pyx":337
  * 
  *     for i in range(len(Vout)):
  *         x = Vout[i]             # <<<<<<<<<<<<<<
@@ -3777,14 +3783,14 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
  */
     if (unlikely(__pyx_v_Vout == Py_None)) {
       PyErr_SetString(PyExc_TypeError, "'NoneType' object is not subscriptable");
-      __PYX_ERR(0, 336, __pyx_L1_error)
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-      /* "my_bliss.pyx":341
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-        /* "my_bliss.pyx":342
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-    /* "my_bliss.pyx":350
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@@ -4100,7 +4106,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
     __pyx_L6:;
   }
 
-  /* "my_bliss.pyx":356
+  /* "my_bliss.pyx":357
  *                 new_edges.append((e, f, lab) if e > f else (f, e, lab))
  * 
  *     if certificate:             # <<<<<<<<<<<<<<
@@ -4110,7 +4116,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   __pyx_t_7 = (__pyx_v_certificate != 0);
   if (__pyx_t_7) {
 
-    /* "my_bliss.pyx":357
+    /* "my_bliss.pyx":358
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  *     if certificate:
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@@ -4118,17 +4124,17 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
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  */
     { /* enter inner scope */
-      __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 357, __pyx_L1_error)
+      __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 358, __pyx_L1_error)
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@@ -4136,7 +4142,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
     __pyx_v_relabel = ((PyObject*)__pyx_t_1);
     __pyx_t_1 = 0;
 
-    /* "my_bliss.pyx":356
+    /* "my_bliss.pyx":357
  *                 new_edges.append((e, f, lab) if e > f else (f, e, lab))
  * 
  *     if certificate:             # <<<<<<<<<<<<<<
@@ -4145,7 +4151,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
  */
   }
 
-  /* "my_bliss.pyx":359
+  /* "my_bliss.pyx":360
  *         relabel = {v: <long>aut[v] for v in range(Vnr)}
  * 
  *     if directed:             # <<<<<<<<<<<<<<
@@ -4155,7 +4161,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   __pyx_t_7 = (__pyx_v_directed != 0);
   if (__pyx_t_7) {
 
-    /* "my_bliss.pyx":360
+    /* "my_bliss.pyx":361
  * 
  *     if directed:
  *         del d             # <<<<<<<<<<<<<<
@@ -4164,7 +4170,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
  */
     delete __pyx_v_d;
 
-    /* "my_bliss.pyx":359
+    /* "my_bliss.pyx":360
  *         relabel = {v: <long>aut[v] for v in range(Vnr)}
  * 
  *     if directed:             # <<<<<<<<<<<<<<
@@ -4174,7 +4180,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
     goto __pyx_L13;
   }
 
-  /* "my_bliss.pyx":362
+  /* "my_bliss.pyx":363
  *         del d
  *     else:
  *         del g             # <<<<<<<<<<<<<<
@@ -4186,7 +4192,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   }
   __pyx_L13:;
 
-  /* "my_bliss.pyx":364
+  /* "my_bliss.pyx":365
  *         del g
  * 
  *     if certificate:             # <<<<<<<<<<<<<<
@@ -4196,7 +4202,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   __pyx_t_7 = (__pyx_v_certificate != 0);
   if (__pyx_t_7) {
 
-    /* "my_bliss.pyx":365
+    /* "my_bliss.pyx":366
  * 
  *     if certificate:
  *         return new_edges, relabel             # <<<<<<<<<<<<<<
@@ -4204,8 +4210,8 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
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-    __pyx_t_1 = PyTuple_New(2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 365, __pyx_L1_error)
+    if (unlikely(!__pyx_v_relabel)) { __Pyx_RaiseUnboundLocalError("relabel"); __PYX_ERR(0, 366, __pyx_L1_error) }
+    __pyx_t_1 = PyTuple_New(2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 366, __pyx_L1_error)
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     __Pyx_GIVEREF(__pyx_v_new_edges);
@@ -4217,7 +4223,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
     __pyx_t_1 = 0;
     goto __pyx_L0;
 
-    /* "my_bliss.pyx":364
+    /* "my_bliss.pyx":365
  *         del g
  * 
  *     if certificate:             # <<<<<<<<<<<<<<
@@ -4226,7 +4232,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
  */
   }
 
-  /* "my_bliss.pyx":367
+  /* "my_bliss.pyx":368
  *         return new_edges, relabel
  *     else:
  *         return new_edges             # <<<<<<<<<<<<<<
@@ -4240,7 +4246,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
     goto __pyx_L0;
   }
 
-  /* "my_bliss.pyx":287
+  /* "my_bliss.pyx":288
  * #####################################################
  * 
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@@ -4268,7 +4274,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form_from_edge_list(int __pyx_v_Vnr
   return __pyx_r;
 }
 
-/* "my_bliss.pyx":369
+/* "my_bliss.pyx":370
  *         return new_edges
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@@ -4335,7 +4341,7 @@ static PyObject *__pyx_f_8my_bliss_canonical_form(PyObject *__pyx_v_G, CYTHON_UN
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   int __pyx_t_22;
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-  __Pyx_TraceCall("canonical_form", __pyx_f[0], 369, 0, __PYX_ERR(0, 369, __pyx_L1_error));
+  __Pyx_TraceCall("canonical_form", __pyx_f[0], 370, 0, __PYX_ERR(0, 370, __pyx_L1_error));
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@@ -4352,14 +4358,14 @@ static PyObject *__pyx_f_8my_bliss_canonical_form(PyObject *__pyx_v_G, CYTHON_UN
   }
   __Pyx_INCREF(__pyx_v_partition);
 
-  /* "my_bliss.pyx":440
+  /* "my_bliss.pyx":441
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  *     cdef unsigned long Vnr = G.order()             # <<<<<<<<<<<<<<
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  * 
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-  __pyx_t_2 = __Pyx_PyObject_GetAttrStr(__pyx_v_G, __pyx_n_s_order); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 440, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_PyObject_GetAttrStr(__pyx_v_G, __pyx_n_s_order); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 441, __pyx_L1_error)
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@@ -4373,14 +4379,14 @@ static PyObject *__pyx_f_8my_bliss_canonical_form(PyObject *__pyx_v_G, CYTHON_UN
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-  if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 440, __pyx_L1_error)
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+  __pyx_t_4 = __Pyx_PyInt_As_unsigned_long(__pyx_t_1); if (unlikely((__pyx_t_4 == (unsigned long)-1) && PyErr_Occurred())) __PYX_ERR(0, 441, __pyx_L1_error)
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-  /* "my_bliss.pyx":441
+  /* "my_bliss.pyx":442
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  *     assert Vnr <= <unsigned long>LONG_MAX             # <<<<<<<<<<<<<<
@@ -4391,19 +4397,19 @@ static PyObject *__pyx_f_8my_bliss_canonical_form(PyObject *__pyx_v_G, CYTHON_UN
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-      __PYX_ERR(0, 441, __pyx_L1_error)
+      __PYX_ERR(0, 442, __pyx_L1_error)
     }
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   #endif
 
-  /* "my_bliss.pyx":443
+  /* "my_bliss.pyx":444
  *     assert Vnr <= <unsigned long>LONG_MAX
  * 
  *     cdef bint directed = G.is_directed()             # <<<<<<<<<<<<<<
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  *     cdef int labInd
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-  __pyx_t_2 = __Pyx_PyObject_GetAttrStr(__pyx_v_G, __pyx_n_s_is_directed); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 443, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_PyObject_GetAttrStr(__pyx_v_G, __pyx_n_s_is_directed); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 444, __pyx_L1_error)
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@@ -4417,62 +4423,62 @@ static PyObject *__pyx_f_8my_bliss_canonical_form(PyObject *__pyx_v_G, CYTHON_UN
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-  if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 443, __pyx_L1_error)
+  if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 444, __pyx_L1_error)
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   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
   __pyx_v_directed = __pyx_t_5;
 
-  /* "my_bliss.pyx":446
+  /* "my_bliss.pyx":447
  * 
  *     cdef int labInd
  *     cdef list Vout   = []             # <<<<<<<<<<<<<<
  *     cdef list Vin    = []
  *     cdef list labels = []
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 446, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 447, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_Vout = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":447
+  /* "my_bliss.pyx":448
  *     cdef int labInd
  *     cdef list Vout   = []
  *     cdef list Vin    = []             # <<<<<<<<<<<<<<
  *     cdef list labels = []
  * 
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 447, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 448, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_Vin = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":448
+  /* "my_bliss.pyx":449
  *     cdef list Vout   = []
  *     cdef list Vin    = []
  *     cdef list labels = []             # <<<<<<<<<<<<<<
  * 
  *     cdef list int2vert = list(G)
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 448, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 449, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_labels = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":450
+  /* "my_bliss.pyx":451
  *     cdef list labels = []
  * 
  *     cdef list int2vert = list(G)             # <<<<<<<<<<<<<<
  *     cdef dict vert2int = {v: i for i, v in enumerate(int2vert)}
  *     cdef list edge_labels = []
  */
-  __pyx_t_1 = PySequence_List(__pyx_v_G); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 450, __pyx_L1_error)
+  __pyx_t_1 = PySequence_List(__pyx_v_G); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 451, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_int2vert = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":451
+  /* "my_bliss.pyx":452
  * 
  *     cdef list int2vert = list(G)
  *     cdef dict vert2int = {v: i for i, v in enumerate(int2vert)}             # <<<<<<<<<<<<<<
@@ -4480,25 +4486,25 @@ static PyObject *__pyx_f_8my_bliss_canonical_form(PyObject *__pyx_v_G, CYTHON_UN
  *     cdef dict edge_labels_rev = {}
  */
   { /* enter inner scope */
-    __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 451, __pyx_L5_error)
+    __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 452, __pyx_L5_error)
     __Pyx_GOTREF(__pyx_t_1);
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       #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
-      __pyx_t_3 = PyList_GET_ITEM(__pyx_t_2, __pyx_t_7); __Pyx_INCREF(__pyx_t_3); __pyx_t_7++; if (unlikely(0 < 0)) __PYX_ERR(0, 451, __pyx_L5_error)
+      __pyx_t_3 = PyList_GET_ITEM(__pyx_t_2, __pyx_t_7); __Pyx_INCREF(__pyx_t_3); __pyx_t_7++; if (unlikely(0 < 0)) __PYX_ERR(0, 452, __pyx_L5_error)
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+      __pyx_t_3 = PySequence_ITEM(__pyx_t_2, __pyx_t_7); __pyx_t_7++; if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 452, __pyx_L5_error)
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       __pyx_t_3 = 0;
       __pyx_8genexpr1__pyx_v_i = __pyx_t_6;
       __pyx_t_6 = (__pyx_t_6 + 1);
-      __pyx_t_3 = PyInt_FromSsize_t(__pyx_8genexpr1__pyx_v_i); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 451, __pyx_L5_error)
+      __pyx_t_3 = PyInt_FromSsize_t(__pyx_8genexpr1__pyx_v_i); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 452, __pyx_L5_error)
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-      if (unlikely(PyDict_SetItem(__pyx_t_1, (PyObject*)__pyx_8genexpr1__pyx_v_v, (PyObject*)__pyx_t_3))) __PYX_ERR(0, 451, __pyx_L5_error)
+      if (unlikely(PyDict_SetItem(__pyx_t_1, (PyObject*)__pyx_8genexpr1__pyx_v_v, (PyObject*)__pyx_t_3))) __PYX_ERR(0, 452, __pyx_L5_error)
       __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
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     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
@@ -4512,31 +4518,31 @@ static PyObject *__pyx_f_8my_bliss_canonical_form(PyObject *__pyx_v_G, CYTHON_UN
   __pyx_v_vert2int = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":452
+  /* "my_bliss.pyx":453
  *     cdef list int2vert = list(G)
  *     cdef dict vert2int = {v: i for i, v in enumerate(int2vert)}
  *     cdef list edge_labels = []             # <<<<<<<<<<<<<<
  *     cdef dict edge_labels_rev = {}
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  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 452, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 453, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_edge_labels = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":453
+  /* "my_bliss.pyx":454
  *     cdef dict vert2int = {v: i for i, v in enumerate(int2vert)}
  *     cdef list edge_labels = []
  *     cdef dict edge_labels_rev = {}             # <<<<<<<<<<<<<<
  *     cdef int Lnr = 0
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-  __pyx_t_1 = __Pyx_PyDict_NewPresized(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 453, __pyx_L1_error)
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   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":454
+  /* "my_bliss.pyx":455
  *     cdef list edge_labels = []
  *     cdef dict edge_labels_rev = {}
  *     cdef int Lnr = 0             # <<<<<<<<<<<<<<
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-      /* "my_bliss.pyx":461
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   { /* enter inner scope */
-    __pyx_t_2 = PyDict_New(); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 479, __pyx_L43_error)
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-      /* "my_bliss.pyx":483
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-      /* "my_bliss.pyx":484
+      /* "my_bliss.pyx":485
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       goto __pyx_L48;
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+    /* "my_bliss.pyx":487
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-      /* "my_bliss.pyx":487
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-    /* "my_bliss.pyx":540
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-  __pyx_t_3 = PyList_New(0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 544, __pyx_L1_error)
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-  /* "my_bliss.pyx":545
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-  /* "my_bliss.pyx":547
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-    /* "my_bliss.pyx":548
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-    /* "my_bliss.pyx":549
+    /* "my_bliss.pyx":550
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-    /* "my_bliss.pyx":550
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-    /* "my_bliss.pyx":547
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-    /* "my_bliss.pyx":553
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-    /* "my_bliss.pyx":554
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-  /* "my_bliss.pyx":498
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-        /* "my_bliss.pyx":731
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-    /* "my_bliss.pyx":738
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+    __pyx_t_19 = __Pyx_PyList_Append(__pyx_v_labels, __pyx_t_9); if (unlikely(__pyx_t_19 == ((int)-1))) __PYX_ERR(0, 739, __pyx_L1_error)
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-    /* "my_bliss.pyx":725
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  *     for x,y,lab in G.edge_iterator(labels=True):             # <<<<<<<<<<<<<<
@@ -7049,25 +7055,25 @@ static PyObject *__pyx_f_8my_bliss_automorphism_group(PyObject *__pyx_v_G, CYTHO
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-  __pyx_t_2 = PyList_New(0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 740, __pyx_L1_error)
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-  /* "my_bliss.pyx":793
+  /* "my_bliss.pyx":794
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-  __pyx_t_2 = PyList_New(1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 793, __pyx_L1_error)
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-  /* "my_bliss.pyx":794
+  /* "my_bliss.pyx":795
  *     # computing this permutation group may not be necessary for my application
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   PyObject *__pyx_v_x = NULL;
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-  bliss::Graph *__pyx_r;
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-  /* "my_bliss.pyx":815
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+        __pyx_t_3 = PyTuple_GET_ITEM(__pyx_t_2, __pyx_t_6); __Pyx_INCREF(__pyx_t_3); __pyx_t_6++; if (unlikely(0 < 0)) __PYX_ERR(0, 821, __pyx_L1_error)
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@@ -8667,7 +8674,7 @@ static bliss::Graph *__pyx_f_8my_bliss_bliss_graph(PyObject *__pyx_v_G, PyObject
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-    /* "my_bliss.pyx":822
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-    /* "my_bliss.pyx":820
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  *     for i, v in enumerate(G):             # <<<<<<<<<<<<<<
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-  /* "my_bliss.pyx":824
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-      /* "my_bliss.pyx":862
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-        __pyx_t_13 = Py_TYPE(__pyx_t_8)->tp_iternext; if (unlikely(!__pyx_t_13)) __PYX_ERR(0, 862, __pyx_L1_error)
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@@ -9463,17 +9585,17 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph(PyObject *__pyx_v_G, PyOb
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+            __pyx_t_2 = PyTuple_GET_ITEM(__pyx_t_8, __pyx_t_12); __Pyx_INCREF(__pyx_t_2); __pyx_t_12++; if (unlikely(0 < 0)) __PYX_ERR(0, 863, __pyx_L1_error)
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@@ -9483,7 +9605,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph(PyObject *__pyx_v_G, PyOb
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-              else __PYX_ERR(0, 862, __pyx_L1_error)
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             break;
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@@ -9492,21 +9614,21 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph(PyObject *__pyx_v_G, PyOb
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         __pyx_t_2 = 0;
 
-        /* "my_bliss.pyx":863
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  *                 g.change_color(vert2int[v], i)             # <<<<<<<<<<<<<<
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  * 
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+        __pyx_t_2 = __Pyx_PyObject_GetItem(__pyx_v_vert2int, __pyx_v_v); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 864, __pyx_L1_error)
         __Pyx_GOTREF(__pyx_t_2);
-        __pyx_t_11 = __Pyx_PyInt_As_unsigned_int(__pyx_t_2); if (unlikely((__pyx_t_11 == (unsigned int)-1) && PyErr_Occurred())) __PYX_ERR(0, 863, __pyx_L1_error)
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         __pyx_v_g->change_color(__pyx_t_11, __pyx_t_4);
 
-        /* "my_bliss.pyx":862
+        /* "my_bliss.pyx":863
  *     if partition:
  *         for i in range(1, len(partition)):
  *             for v in partition[i]:             # <<<<<<<<<<<<<<
@@ -9516,7 +9638,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph(PyObject *__pyx_v_G, PyOb
       }
       __Pyx_DECREF(__pyx_t_8); __pyx_t_8 = 0;
 
-      /* "my_bliss.pyx":861
+      /* "my_bliss.pyx":862
  * 
  *     if partition:
  *         for i in range(1, len(partition)):             # <<<<<<<<<<<<<<
@@ -9526,7 +9648,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph(PyObject *__pyx_v_G, PyOb
     }
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-    /* "my_bliss.pyx":860
+    /* "my_bliss.pyx":861
  *         g.add_edge(vert2int[x], vert2int[y])
  * 
  *     if partition:             # <<<<<<<<<<<<<<
@@ -9535,7 +9657,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph(PyObject *__pyx_v_G, PyOb
  */
   }
 
-  /* "my_bliss.pyx":864
+  /* "my_bliss.pyx":865
  *             for v in partition[i]:
  *                 g.change_color(vert2int[v], i)
  *     return g             # <<<<<<<<<<<<<<
@@ -9545,8 +9667,8 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph(PyObject *__pyx_v_G, PyOb
   __pyx_r = __pyx_v_g;
   goto __pyx_L0;
 
-  /* "my_bliss.pyx":833
- *     return g
+  /* "my_bliss.pyx":834
+ *     return <Py_ssize_t> g;
  * 
  * cdef Digraph *bliss_digraph(G, partition, vert2int, int2vert):             # <<<<<<<<<<<<<<
  *     r"""
@@ -9572,7 +9694,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph(PyObject *__pyx_v_G, PyOb
   return __pyx_r;
 }
 
-/* "my_bliss.pyx":866
+/* "my_bliss.pyx":867
  *     return g
  * 
  * cpdef raw_automorphism_generators(G, partition=None, use_edge_labels=True):             # <<<<<<<<<<<<<<
@@ -9580,7 +9702,7 @@ static bliss::Digraph *__pyx_f_8my_bliss_bliss_digraph(PyObject *__pyx_v_G, PyOb
  *     cdef unsigned long Vnr = G.order()
  */
 
-static PyObject *__pyx_pw_8my_bliss_7raw_automorphism_generators(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
+static PyObject *__pyx_pw_8my_bliss_9raw_automorphism_generators(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
 static PyObject *__pyx_f_8my_bliss_raw_automorphism_generators(PyObject *__pyx_v_G, CYTHON_UNUSED int __pyx_skip_dispatch, struct __pyx_opt_args_8my_bliss_raw_automorphism_generators *__pyx_optional_args) {
   PyObject *__pyx_v_partition = ((PyObject *)Py_None);
   PyObject *__pyx_v_use_edge_labels = ((PyObject *)Py_True);
@@ -9629,7 +9751,7 @@ static PyObject *__pyx_f_8my_bliss_raw_automorphism_generators(PyObject *__pyx_v
   int __pyx_t_19;
   struct __pyx_opt_args_8my_bliss_automorphism_group_gens_from_edge_list __pyx_t_20;
   __Pyx_RefNannySetupContext("raw_automorphism_generators", 0);
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@@ -9640,14 +9762,14 @@ static PyObject *__pyx_f_8my_bliss_raw_automorphism_generators(PyObject *__pyx_v
   }
   __Pyx_INCREF(__pyx_v_partition);
 
-  /* "my_bliss.pyx":868
+  /* "my_bliss.pyx":869
  * cpdef raw_automorphism_generators(G, partition=None, use_edge_labels=True):
  *     # compute the automorphism group, and then use this to compute orbits
  *     cdef unsigned long Vnr = G.order()             # <<<<<<<<<<<<<<
  *     assert Vnr <= <unsigned long>LONG_MAX
  * 
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-  __pyx_t_2 = __Pyx_PyObject_GetAttrStr(__pyx_v_G, __pyx_n_s_order); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 868, __pyx_L1_error)
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@@ -9661,14 +9783,14 @@ static PyObject *__pyx_f_8my_bliss_raw_automorphism_generators(PyObject *__pyx_v
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+  __pyx_t_4 = __Pyx_PyInt_As_unsigned_long(__pyx_t_1); if (unlikely((__pyx_t_4 == (unsigned long)-1) && PyErr_Occurred())) __PYX_ERR(0, 869, __pyx_L1_error)
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   __pyx_v_Vnr = __pyx_t_4;
 
-  /* "my_bliss.pyx":869
+  /* "my_bliss.pyx":870
  *     # compute the automorphism group, and then use this to compute orbits
  *     cdef unsigned long Vnr = G.order()
  *     assert Vnr <= <unsigned long>LONG_MAX             # <<<<<<<<<<<<<<
@@ -9679,19 +9801,19 @@ static PyObject *__pyx_f_8my_bliss_raw_automorphism_generators(PyObject *__pyx_v
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-      __PYX_ERR(0, 869, __pyx_L1_error)
+      __PYX_ERR(0, 870, __pyx_L1_error)
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   }
   #endif
 
-  /* "my_bliss.pyx":871
+  /* "my_bliss.pyx":872
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  * 
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  * 
  *     cdef int labInd
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+  __pyx_t_2 = __Pyx_PyObject_GetAttrStr(__pyx_v_G, __pyx_n_s_is_directed); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 872, __pyx_L1_error)
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@@ -9705,62 +9827,62 @@ static PyObject *__pyx_f_8my_bliss_raw_automorphism_generators(PyObject *__pyx_v
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-  if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 871, __pyx_L1_error)
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+  __pyx_t_5 = __Pyx_PyObject_IsTrue(__pyx_t_1); if (unlikely((__pyx_t_5 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 872, __pyx_L1_error)
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
   __pyx_v_directed = __pyx_t_5;
 
-  /* "my_bliss.pyx":874
+  /* "my_bliss.pyx":875
  * 
  *     cdef int labInd
  *     cdef list Vout   = []             # <<<<<<<<<<<<<<
  *     cdef list Vin    = []
  *     cdef list labels = []
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 874, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 875, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_Vout = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":875
+  /* "my_bliss.pyx":876
  *     cdef int labInd
  *     cdef list Vout   = []
  *     cdef list Vin    = []             # <<<<<<<<<<<<<<
  *     cdef list labels = []
  * 
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 875, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 876, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_Vin = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":876
+  /* "my_bliss.pyx":877
  *     cdef list Vout   = []
  *     cdef list Vin    = []
  *     cdef list labels = []             # <<<<<<<<<<<<<<
  * 
  *     cdef list int2vert = list(G)
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 876, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 877, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_labels = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":878
+  /* "my_bliss.pyx":879
  *     cdef list labels = []
  * 
  *     cdef list int2vert = list(G)             # <<<<<<<<<<<<<<
  *     cdef dict vert2int = {v: i for i, v in enumerate(int2vert)}
  *     cdef list edge_labels = []
  */
-  __pyx_t_1 = PySequence_List(__pyx_v_G); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 878, __pyx_L1_error)
+  __pyx_t_1 = PySequence_List(__pyx_v_G); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 879, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_int2vert = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "my_bliss.pyx":879
+  /* "my_bliss.pyx":880
  * 
  *     cdef list int2vert = list(G)
  *     cdef dict vert2int = {v: i for i, v in enumerate(int2vert)}             # <<<<<<<<<<<<<<
@@ -9768,25 +9890,25 @@ static PyObject *__pyx_f_8my_bliss_raw_automorphism_generators(PyObject *__pyx_v
  *     cdef dict edge_labels_rev = {}
  */
   { /* enter inner scope */
-    __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 879, __pyx_L5_error)
+    __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 880, __pyx_L5_error)
     __Pyx_GOTREF(__pyx_t_1);
     __pyx_t_6 = 0;
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       #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
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+      __pyx_t_3 = PyList_GET_ITEM(__pyx_t_2, __pyx_t_7); __Pyx_INCREF(__pyx_t_3); __pyx_t_7++; if (unlikely(0 < 0)) __PYX_ERR(0, 880, __pyx_L5_error)
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  *             raise MemoryError("allocation failed")             # <<<<<<<<<<<<<<
  *     else:
  *         logLnr = len(numpy.binary_repr(Lnr))
  */
-  __pyx_tuple_ = PyTuple_Pack(1, __pyx_kp_s_allocation_failed); if (unlikely(!__pyx_tuple_)) __PYX_ERR(0, 243, __pyx_L1_error)
+  __pyx_tuple_ = PyTuple_Pack(1, __pyx_kp_s_allocation_failed); if (unlikely(!__pyx_tuple_)) __PYX_ERR(0, 244, __pyx_L1_error)
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   __Pyx_GIVEREF(__pyx_tuple_);
 
-  /* "my_bliss.pyx":248
+  /* "my_bliss.pyx":249
  *         g = new Digraph(Vnr * logLnr)
  *         if not g:
  *             raise MemoryError("allocation failed")             # <<<<<<<<<<<<<<
  *         for j in range(1, logLnr):
  *             for i in range((j - 1) * Vnr, j * Vnr):
  */
-  __pyx_tuple_ = PyTuple_Pack(1, __pyx_kp_s_allocation_failed); if (unlikely(!__pyx_tuple_)) __PYX_ERR(0, 248, __pyx_L1_error)
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-  /* "my_bliss.pyx":818
+  /* "my_bliss.pyx":819
  * 
  *     if not g:
  *         raise MemoryError("allocation failed")             # <<<<<<<<<<<<<<
  * 
  *     for i, v in enumerate(G):
  */
-  __pyx_tuple_ = PyTuple_Pack(1, __pyx_kp_s_allocation_failed); if (unlikely(!__pyx_tuple_)) __PYX_ERR(0, 818, __pyx_L1_error)
+  __pyx_tuple_ = PyTuple_Pack(1, __pyx_kp_s_allocation_failed); if (unlikely(!__pyx_tuple_)) __PYX_ERR(0, 819, __pyx_L1_error)
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-  /* "my_bliss.pyx":851
+  /* "my_bliss.pyx":852
  * 
  *     if not g:
  *         raise MemoryError("allocation failed")             # <<<<<<<<<<<<<<
  * 
  *     for i, v in enumerate(G):
  */
-  __pyx_tuple_ = PyTuple_Pack(1, __pyx_kp_s_allocation_failed); if (unlikely(!__pyx_tuple_)) __PYX_ERR(0, 851, __pyx_L1_error)
+  __pyx_tuple_ = PyTuple_Pack(1, __pyx_kp_s_allocation_failed); if (unlikely(!__pyx_tuple_)) __PYX_ERR(0, 852, __pyx_L1_error)
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   __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
 
-  /* "my_bliss.pyx":287
+  /* "my_bliss.pyx":288
  * #####################################################
  * 
  * cdef canonical_form_from_edge_list(int Vnr, list Vout, list Vin, int Lnr=1, list labels=[],             # <<<<<<<<<<<<<<
  *                                        list partition=None, bint directed=False, bint certificate=False):
  *     r"""
  */
-  __pyx_t_2 = PyList_New(0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 287, __pyx_L1_error)
+  __pyx_t_2 = PyList_New(0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 288, __pyx_L1_error)
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   __Pyx_GIVEREF(__pyx_t_2);
   __pyx_t_2 = 0;
 
-  /* "my_bliss.pyx":498
+  /* "my_bliss.pyx":499
  * #####################################################
  * 
  * cdef automorphism_group_gens_from_edge_list(int Vnr, Vout, Vin, int Lnr=1, labels=[],             # <<<<<<<<<<<<<<
  *                                                 int2vert=[], partition=None, bint directed=False):
  *     r"""
  */
-  __pyx_t_2 = PyList_New(0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 498, __pyx_L1_error)
+  __pyx_t_2 = PyList_New(0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 499, __pyx_L1_error)
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   __pyx_t_2 = 0;
 
-  /* "my_bliss.pyx":499
+  /* "my_bliss.pyx":500
  * 
  * cdef automorphism_group_gens_from_edge_list(int Vnr, Vout, Vin, int Lnr=1, labels=[],
  *                                                 int2vert=[], partition=None, bint directed=False):             # <<<<<<<<<<<<<<
  *     r"""
  *     Return an unsorted list of labelled edges of a canonical form.
  */
-  __pyx_t_2 = PyList_New(0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 499, __pyx_L1_error)
+  __pyx_t_2 = PyList_New(0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 500, __pyx_L1_error)
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diff --git a/my_bliss.pyx b/my_bliss.pyx
index 0f577d1..addc65d 100644
--- a/my_bliss.pyx
+++ b/my_bliss.pyx
@@ -798,7 +798,7 @@ cpdef orbits_and_canonical_labeling(G, partition=None, use_edge_labels=True):
 # old direct interactions graphs <-> bliss graphs
 #####################################################
 
-cdef Graph *bliss_graph(G, partition, vert2int, int2vert):
+cpdef object bliss_graph(G, partition, vert2int, int2vert):
     r"""
     Return a bliss copy of a graph G
 
@@ -829,7 +829,7 @@ cdef Graph *bliss_graph(G, partition, vert2int, int2vert):
         for i in range(1, len(partition)):
             for v in partition[i]:
                 g.change_color(vert2int[v], i)
-    return g
+    return <Py_ssize_t> g;
 
 cdef Digraph *bliss_digraph(G, partition, vert2int, int2vert):
     r"""
diff --git a/orbitgen.py b/orbitgen.py
index 4ebad28..4c412bd 100644
--- a/orbitgen.py
+++ b/orbitgen.py
@@ -15,8 +15,6 @@ def bfs_foldrep(graph, colors, fixcolors, acc, f):
     reps = set()
     while len(queue) != 0:
         c = queue.popleft()
-        # print("----")
-        # print("Current color: %s" % (c + fixcolors))
         # TODO: turn this into a single GI call by having it return both the
         # automorphism group and the canonical form
         gcanon, cert = my_bliss.canonical_form(graph, partition=c + fixcolors, certificate=True,
@@ -34,47 +32,46 @@ def bfs_foldrep(graph, colors, fixcolors, acc, f):
 
         if (gcanon, (tuple(c_canon[0]), tuple(c_canon[1]))) in reps:
             continue
-        acc = f(acc, graph, c)
+
+        A, orbits = graph.automorphism_group(partition=c + fixcolors, orbits=True,
+                                             algorithm="bliss")
+        acc = f(acc, graph, c, A)
         reps.add((gcanon, (tuple(c_canon[0]), tuple(c_canon[1]))))
 
         if len(c_canon[0]) + 1 <= len(colors) / 2.0:
             # if we can add more colors, try to
 
-            gens = my_bliss.raw_automorphism_generators(graph, partition=c + fixcolors)
-            # big speed hack: compute orbits from generators. avoid calling GAP for this.
-            vset = set(colors)
-            seenset = set()
-            cur_orbit = set()
-            cur_point = graph.vertices()[0]
-            orbits = []
-            while True:
-                if cur_point in cur_orbit:
-                    orbits += [cur_orbit.copy()]
-                    cur_orbit = set()
-                    # see if there are any more vertices
-                    remaining = vset - seenset
-                    if len(remaining) == 0:
-                        break
-                    cur_point = remaining.pop()
-                seenset.add(cur_point)
-                cur_orbit.add(cur_point)
-                # apply a generator to this point
-                for gen in gens:
-                    # a generator is a list of cycles, so we go one level deeper
-                    for cyc in gen:
-                        try:
-                            i = cyc.index(cur_point)
-                            cur_point = cyc[(i + 1) % len(cyc)]
-                            break
-                        except:
-                            continue
-
+            # gens = my_bliss.raw_automorphism_generators(graph, partition=c + fixcolors)
+            # # big speed hack: compute orbits from generators. avoid calling GAP for this.
+            # vset = set(colors)
+            # seenset = set()
+            # orbits = []
+            # def step_point(point):
+            #     res = []
+            #     for gen in gens:
+            #         # a generator is a list of cycles, so we go one level deeper
+            #         for cyc in gen:
+            #             try:
+            #                 i = cyc.index(point)
+            #                 res.append(cyc[(i + 1) % len(cyc)])
+            #             except:
+            #                 continue
+            #     return res
+            # def dfs_find_orbit(gens, point, cur_orbit):
+            #     frontier = step_point(point)
+            #     cur_orbit.update(frontier)
+            #     for new_point in cur_orbit - set(frontier):
+            #         cur_orbit.update(dfs_find_orbit(gens, new_point, cur_orbit))
+            #     return cur_orbit
+            # while vset != seenset:
+            #     diff = vset - seenset
+            #     cur_point = diff.pop()
+            #     new_orbit = dfs_find_orbit(gens, cur_point, set([cur_point]))
+            #     seenset.update(new_orbit)
+            #     orbits.append(new_orbit)
             # if we need the full automorphism group, we can compute it here.
-            # A, orbits = graph.automorphism_group(partition=c + fixcolors, orbits=True,
-            #                                      algorithm="bliss")
             # expand this node and add it to the queue
             for o in orbits:
-                # print("Considering orbit %s" % o)
                 e = o.pop() # pick an element in the orbit arbitrarily
                 # check if this orbit is already true, or if it is any of the fixed colors
                 if e in c[0] or e in [y for x in fixcolors for y in x]:
@@ -87,7 +84,7 @@ def bfs_foldrep(graph, colors, fixcolors, acc, f):
 def genrep_bfs(G):
     colors = G.vertices()
     # folding function
-    def add_vertex(acc, g, color):
+    def add_vertex(acc, g, color, A):
         if len(color[0]) < len(g.vertices()) / 2.0:
             return acc + [color] + [color[::-1]]
 
@@ -98,7 +95,7 @@ def add_vertex(acc, g, color):
 def genrep_bfs_factor(G, varnodes, colornodes):
     colors = varnodes
     # folding function
-    def add_vertex(acc, g, color):
+    def add_vertex(acc, g, color, A):
         if len(color[0]) < len(varnodes) / 2.0:
             return acc + [color] + [color[::-1]]
 
@@ -128,7 +125,6 @@ def sum_prob(acc, g, color):
 def bruteforce_partition(G, potential):
     # evaluate the potential on every assignment to variables
     def recurse(c1, c2):
-        print(c1)
         if len(c1) == 0:
             return 0
         tot = potential([c1, c2])
@@ -162,15 +158,15 @@ def find_representatives():
     # G = graphs.EmptyGraph()
     # for v in range(0, 300):
     #     G.add_vertex(v)
-    # G = gen_complete_pairwise_factor(100)
+    G = gen_complete_pairwise_factor(100)
     # G = graphs.CompleteGraph(5)
-    # G = gen_friends_smokers(10)
+    # G = gen_pigeonhole(5,5)
     # G = graphs.CycleGraph(20)
     # G = gen_complete_extra(20)
-    G = gen_friends_smokers_factor(7)
+    # G = gen_friends_smokers_factor(6)
     # G = G.complement()
     # r = genrep_bfs(G)
-    r = genrep_bfs_factor(G[0].complement(), G[1][0], [G[1][1]])
+    r = genrep_bfs_factor(G[0], G[1][0], [G[1][1]])
     for x in r:
         print(x)
     print("Found configurations: %d" % len(r))