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- // Copyright (C) 2001 Jeremy Siek, Douglas Gregor, Brian Osman
- //
- // Distributed under the Boost Software License, Version 1.0. (See
- // accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_GRAPH_ISOMORPHISM_HPP
- #define BOOST_GRAPH_ISOMORPHISM_HPP
- #include <utility>
- #include <vector>
- #include <iterator>
- #include <algorithm>
- #include <boost/config.hpp>
- #include <boost/assert.hpp>
- #include <boost/smart_ptr.hpp>
- #include <boost/graph/depth_first_search.hpp>
- #include <boost/detail/algorithm.hpp>
- #include <boost/pending/indirect_cmp.hpp> // for make_indirect_pmap
- #include <boost/concept/assert.hpp>
- #ifndef BOOST_GRAPH_ITERATION_MACROS_HPP
- #define BOOST_ISO_INCLUDED_ITER_MACROS // local macro, see bottom of file
- #include <boost/graph/iteration_macros.hpp>
- #endif
- namespace boost
- {
- namespace detail
- {
- template < typename Graph1, typename Graph2, typename IsoMapping,
- typename Invariant1, typename Invariant2, typename IndexMap1,
- typename IndexMap2 >
- class isomorphism_algo
- {
- typedef typename graph_traits< Graph1 >::vertex_descriptor vertex1_t;
- typedef typename graph_traits< Graph2 >::vertex_descriptor vertex2_t;
- typedef typename graph_traits< Graph1 >::edge_descriptor edge1_t;
- typedef typename graph_traits< Graph1 >::vertices_size_type size_type;
- typedef typename Invariant1::result_type invar1_value;
- typedef typename Invariant2::result_type invar2_value;
- const Graph1& G1;
- const Graph2& G2;
- IsoMapping f;
- Invariant1 invariant1;
- Invariant2 invariant2;
- std::size_t max_invariant;
- IndexMap1 index_map1;
- IndexMap2 index_map2;
- std::vector< vertex1_t > dfs_vertices;
- typedef typename std::vector< vertex1_t >::iterator vertex_iter;
- std::vector< int > dfs_num_vec;
- typedef safe_iterator_property_map<
- typename std::vector< int >::iterator, IndexMap1
- #ifdef BOOST_NO_STD_ITERATOR_TRAITS
- ,
- int, int&
- #endif /* BOOST_NO_STD_ITERATOR_TRAITS */
- >
- DFSNumMap;
- DFSNumMap dfs_num;
- std::vector< edge1_t > ordered_edges;
- typedef typename std::vector< edge1_t >::iterator edge_iter;
- std::vector< char > in_S_vec;
- typedef safe_iterator_property_map<
- typename std::vector< char >::iterator, IndexMap2
- #ifdef BOOST_NO_STD_ITERATOR_TRAITS
- ,
- char, char&
- #endif /* BOOST_NO_STD_ITERATOR_TRAITS */
- >
- InSMap;
- InSMap in_S;
- int num_edges_on_k;
- friend struct compare_multiplicity;
- struct compare_multiplicity
- {
- compare_multiplicity(Invariant1 invariant1, size_type* multiplicity)
- : invariant1(invariant1), multiplicity(multiplicity)
- {
- }
- bool operator()(const vertex1_t& x, const vertex1_t& y) const
- {
- return multiplicity[invariant1(x)]
- < multiplicity[invariant1(y)];
- }
- Invariant1 invariant1;
- size_type* multiplicity;
- };
- struct record_dfs_order : default_dfs_visitor
- {
- record_dfs_order(
- std::vector< vertex1_t >& v, std::vector< edge1_t >& e)
- : vertices(v), edges(e)
- {
- }
- void discover_vertex(vertex1_t v, const Graph1&) const
- {
- vertices.push_back(v);
- }
- void examine_edge(edge1_t e, const Graph1&) const
- {
- edges.push_back(e);
- }
- std::vector< vertex1_t >& vertices;
- std::vector< edge1_t >& edges;
- };
- struct edge_cmp
- {
- edge_cmp(const Graph1& G1, DFSNumMap dfs_num)
- : G1(G1), dfs_num(dfs_num)
- {
- }
- bool operator()(const edge1_t& e1, const edge1_t& e2) const
- {
- using namespace std;
- int u1 = dfs_num[source(e1, G1)], v1 = dfs_num[target(e1, G1)];
- int u2 = dfs_num[source(e2, G1)], v2 = dfs_num[target(e2, G1)];
- int m1 = (max)(u1, v1);
- int m2 = (max)(u2, v2);
- // lexicographical comparison
- return std::make_pair(m1, std::make_pair(u1, v1))
- < std::make_pair(m2, std::make_pair(u2, v2));
- }
- const Graph1& G1;
- DFSNumMap dfs_num;
- };
- public:
- isomorphism_algo(const Graph1& G1, const Graph2& G2, IsoMapping f,
- Invariant1 invariant1, Invariant2 invariant2,
- std::size_t max_invariant, IndexMap1 index_map1,
- IndexMap2 index_map2)
- : G1(G1)
- , G2(G2)
- , f(f)
- , invariant1(invariant1)
- , invariant2(invariant2)
- , max_invariant(max_invariant)
- , index_map1(index_map1)
- , index_map2(index_map2)
- {
- in_S_vec.resize(num_vertices(G1));
- in_S = make_safe_iterator_property_map(
- in_S_vec.begin(), in_S_vec.size(), index_map2
- #ifdef BOOST_NO_STD_ITERATOR_TRAITS
- ,
- in_S_vec.front()
- #endif /* BOOST_NO_STD_ITERATOR_TRAITS */
- );
- }
- bool test_isomorphism()
- {
- // reset isomapping
- BGL_FORALL_VERTICES_T(v, G1, Graph1)
- f[v] = graph_traits< Graph2 >::null_vertex();
- {
- std::vector< invar1_value > invar1_array;
- BGL_FORALL_VERTICES_T(v, G1, Graph1)
- invar1_array.push_back(invariant1(v));
- sort(invar1_array);
- std::vector< invar2_value > invar2_array;
- BGL_FORALL_VERTICES_T(v, G2, Graph2)
- invar2_array.push_back(invariant2(v));
- sort(invar2_array);
- if (!equal(invar1_array, invar2_array))
- return false;
- }
- std::vector< vertex1_t > V_mult;
- BGL_FORALL_VERTICES_T(v, G1, Graph1)
- V_mult.push_back(v);
- {
- std::vector< size_type > multiplicity(max_invariant, 0);
- BGL_FORALL_VERTICES_T(v, G1, Graph1)
- ++multiplicity.at(invariant1(v));
- sort(
- V_mult, compare_multiplicity(invariant1, &multiplicity[0]));
- }
- std::vector< default_color_type > color_vec(num_vertices(G1));
- safe_iterator_property_map<
- std::vector< default_color_type >::iterator, IndexMap1
- #ifdef BOOST_NO_STD_ITERATOR_TRAITS
- ,
- default_color_type, default_color_type&
- #endif /* BOOST_NO_STD_ITERATOR_TRAITS */
- >
- color_map(color_vec.begin(), color_vec.size(), index_map1);
- record_dfs_order dfs_visitor(dfs_vertices, ordered_edges);
- typedef color_traits< default_color_type > Color;
- for (vertex_iter u = V_mult.begin(); u != V_mult.end(); ++u)
- {
- if (color_map[*u] == Color::white())
- {
- dfs_visitor.start_vertex(*u, G1);
- depth_first_visit(G1, *u, dfs_visitor, color_map);
- }
- }
- // Create the dfs_num array and dfs_num_map
- dfs_num_vec.resize(num_vertices(G1));
- dfs_num = make_safe_iterator_property_map(
- dfs_num_vec.begin(), dfs_num_vec.size(), index_map1
- #ifdef BOOST_NO_STD_ITERATOR_TRAITS
- ,
- dfs_num_vec.front()
- #endif /* BOOST_NO_STD_ITERATOR_TRAITS */
- );
- size_type n = 0;
- for (vertex_iter v = dfs_vertices.begin(); v != dfs_vertices.end();
- ++v)
- dfs_num[*v] = n++;
- sort(ordered_edges, edge_cmp(G1, dfs_num));
- int dfs_num_k = -1;
- return this->match(ordered_edges.begin(), dfs_num_k);
- }
- private:
- struct match_continuation
- {
- enum
- {
- pos_G2_vertex_loop,
- pos_fi_adj_loop,
- pos_dfs_num
- } position;
- typedef typename graph_traits< Graph2 >::vertex_iterator
- vertex_iterator;
- std::pair< vertex_iterator, vertex_iterator > G2_verts;
- typedef typename graph_traits< Graph2 >::adjacency_iterator
- adjacency_iterator;
- std::pair< adjacency_iterator, adjacency_iterator > fi_adj;
- edge_iter iter;
- int dfs_num_k;
- };
- bool match(edge_iter iter, int dfs_num_k)
- {
- std::vector< match_continuation > k;
- typedef typename graph_traits< Graph2 >::vertex_iterator
- vertex_iterator;
- std::pair< vertex_iterator, vertex_iterator > G2_verts(
- vertices(G2));
- typedef typename graph_traits< Graph2 >::adjacency_iterator
- adjacency_iterator;
- std::pair< adjacency_iterator, adjacency_iterator > fi_adj;
- vertex1_t i, j;
- recur:
- if (iter != ordered_edges.end())
- {
- i = source(*iter, G1);
- j = target(*iter, G1);
- if (dfs_num[i] > dfs_num_k)
- {
- G2_verts = vertices(G2);
- while (G2_verts.first != G2_verts.second)
- {
- {
- vertex2_t u = *G2_verts.first;
- vertex1_t kp1 = dfs_vertices[dfs_num_k + 1];
- if (invariant1(kp1) == invariant2(u)
- && in_S[u] == false)
- {
- {
- f[kp1] = u;
- in_S[u] = true;
- num_edges_on_k = 0;
- match_continuation new_k;
- new_k.position = match_continuation::
- pos_G2_vertex_loop;
- new_k.G2_verts = G2_verts;
- new_k.iter = iter;
- new_k.dfs_num_k = dfs_num_k;
- k.push_back(new_k);
- ++dfs_num_k;
- goto recur;
- }
- }
- }
- G2_loop_k:
- ++G2_verts.first;
- }
- }
- else if (dfs_num[j] > dfs_num_k)
- {
- {
- vertex1_t vk = dfs_vertices[dfs_num_k];
- num_edges_on_k -= count_if(adjacent_vertices(f[vk], G2),
- make_indirect_pmap(in_S));
- for (int jj = 0; jj < dfs_num_k; ++jj)
- {
- vertex1_t j = dfs_vertices[jj];
- num_edges_on_k
- -= count(adjacent_vertices(f[j], G2), f[vk]);
- }
- }
- if (num_edges_on_k != 0)
- goto return_point_false;
- fi_adj = adjacent_vertices(f[i], G2);
- while (fi_adj.first != fi_adj.second)
- {
- {
- vertex2_t v = *fi_adj.first;
- if (invariant2(v) == invariant1(j)
- && in_S[v] == false)
- {
- f[j] = v;
- in_S[v] = true;
- num_edges_on_k = 1;
- BOOST_USING_STD_MAX();
- int next_k
- = max BOOST_PREVENT_MACRO_SUBSTITUTION(
- dfs_num_k,
- max BOOST_PREVENT_MACRO_SUBSTITUTION(
- dfs_num[i], dfs_num[j]));
- match_continuation new_k;
- new_k.position
- = match_continuation::pos_fi_adj_loop;
- new_k.fi_adj = fi_adj;
- new_k.iter = iter;
- new_k.dfs_num_k = dfs_num_k;
- ++iter;
- dfs_num_k = next_k;
- k.push_back(new_k);
- goto recur;
- }
- }
- fi_adj_loop_k:
- ++fi_adj.first;
- }
- }
- else
- {
- if (container_contains(adjacent_vertices(f[i], G2), f[j]))
- {
- ++num_edges_on_k;
- match_continuation new_k;
- new_k.position = match_continuation::pos_dfs_num;
- k.push_back(new_k);
- ++iter;
- goto recur;
- }
- }
- }
- else
- goto return_point_true;
- goto return_point_false;
- {
- return_point_true:
- return true;
- return_point_false:
- if (k.empty())
- return false;
- const match_continuation& this_k = k.back();
- switch (this_k.position)
- {
- case match_continuation::pos_G2_vertex_loop:
- {
- G2_verts = this_k.G2_verts;
- iter = this_k.iter;
- dfs_num_k = this_k.dfs_num_k;
- k.pop_back();
- in_S[*G2_verts.first] = false;
- i = source(*iter, G1);
- j = target(*iter, G1);
- goto G2_loop_k;
- }
- case match_continuation::pos_fi_adj_loop:
- {
- fi_adj = this_k.fi_adj;
- iter = this_k.iter;
- dfs_num_k = this_k.dfs_num_k;
- k.pop_back();
- in_S[*fi_adj.first] = false;
- i = source(*iter, G1);
- j = target(*iter, G1);
- goto fi_adj_loop_k;
- }
- case match_continuation::pos_dfs_num:
- {
- k.pop_back();
- goto return_point_false;
- }
- default:
- {
- BOOST_ASSERT(!"Bad position");
- #ifdef UNDER_CE
- exit(-1);
- #else
- abort();
- #endif
- }
- }
- }
- }
- };
- template < typename Graph, typename InDegreeMap >
- void compute_in_degree(const Graph& g, InDegreeMap in_degree_map)
- {
- BGL_FORALL_VERTICES_T(v, g, Graph)
- put(in_degree_map, v, 0);
- BGL_FORALL_VERTICES_T(u, g, Graph)
- BGL_FORALL_ADJ_T(u, v, g, Graph)
- put(in_degree_map, v, get(in_degree_map, v) + 1);
- }
- } // namespace detail
- template < typename InDegreeMap, typename Graph > class degree_vertex_invariant
- {
- typedef typename graph_traits< Graph >::vertex_descriptor vertex_t;
- typedef typename graph_traits< Graph >::degree_size_type size_type;
- public:
- typedef vertex_t argument_type;
- typedef size_type result_type;
- degree_vertex_invariant(const InDegreeMap& in_degree_map, const Graph& g)
- : m_in_degree_map(in_degree_map)
- , m_max_vertex_in_degree(0)
- , m_max_vertex_out_degree(0)
- , m_g(g)
- {
- BGL_FORALL_VERTICES_T(v, g, Graph)
- {
- m_max_vertex_in_degree
- = (std::max)(m_max_vertex_in_degree, get(m_in_degree_map, v));
- m_max_vertex_out_degree
- = (std::max)(m_max_vertex_out_degree, out_degree(v, g));
- }
- }
- size_type operator()(vertex_t v) const
- {
- return (m_max_vertex_in_degree + 1) * out_degree(v, m_g)
- + get(m_in_degree_map, v);
- }
- // The largest possible vertex invariant number
- size_type max BOOST_PREVENT_MACRO_SUBSTITUTION() const
- {
- return (m_max_vertex_in_degree + 1) * (m_max_vertex_out_degree + 1);
- }
- private:
- InDegreeMap m_in_degree_map;
- size_type m_max_vertex_in_degree;
- size_type m_max_vertex_out_degree;
- const Graph& m_g;
- };
- // Count actual number of vertices, even in filtered graphs.
- template < typename Graph > size_t count_vertices(const Graph& g)
- {
- size_t n = 0;
- BGL_FORALL_VERTICES_T(v, g, Graph)
- {
- (void)v;
- ++n;
- }
- return n;
- }
- template < typename Graph1, typename Graph2, typename IsoMapping,
- typename Invariant1, typename Invariant2, typename IndexMap1,
- typename IndexMap2 >
- bool isomorphism(const Graph1& G1, const Graph2& G2, IsoMapping f,
- Invariant1 invariant1, Invariant2 invariant2, std::size_t max_invariant,
- IndexMap1 index_map1, IndexMap2 index_map2)
- {
- // Graph requirements
- BOOST_CONCEPT_ASSERT((VertexListGraphConcept< Graph1 >));
- BOOST_CONCEPT_ASSERT((EdgeListGraphConcept< Graph1 >));
- BOOST_CONCEPT_ASSERT((VertexListGraphConcept< Graph2 >));
- // BOOST_CONCEPT_ASSERT(( BidirectionalGraphConcept<Graph2> ));
- typedef typename graph_traits< Graph1 >::vertex_descriptor vertex1_t;
- typedef typename graph_traits< Graph2 >::vertex_descriptor vertex2_t;
- typedef typename graph_traits< Graph1 >::vertices_size_type size_type;
- // Vertex invariant requirement
- BOOST_CONCEPT_ASSERT(
- (AdaptableUnaryFunctionConcept< Invariant1, size_type, vertex1_t >));
- BOOST_CONCEPT_ASSERT(
- (AdaptableUnaryFunctionConcept< Invariant2, size_type, vertex2_t >));
- // Property map requirements
- BOOST_CONCEPT_ASSERT(
- (ReadWritePropertyMapConcept< IsoMapping, vertex1_t >));
- typedef typename property_traits< IsoMapping >::value_type IsoMappingValue;
- BOOST_STATIC_ASSERT((is_convertible< IsoMappingValue, vertex2_t >::value));
- BOOST_CONCEPT_ASSERT((ReadablePropertyMapConcept< IndexMap1, vertex1_t >));
- typedef typename property_traits< IndexMap1 >::value_type IndexMap1Value;
- BOOST_STATIC_ASSERT((is_convertible< IndexMap1Value, size_type >::value));
- BOOST_CONCEPT_ASSERT((ReadablePropertyMapConcept< IndexMap2, vertex2_t >));
- typedef typename property_traits< IndexMap2 >::value_type IndexMap2Value;
- BOOST_STATIC_ASSERT((is_convertible< IndexMap2Value, size_type >::value));
- if (count_vertices(G1) != count_vertices(G2))
- return false;
- if (count_vertices(G1) == 0 && count_vertices(G2) == 0)
- return true;
- detail::isomorphism_algo< Graph1, Graph2, IsoMapping, Invariant1,
- Invariant2, IndexMap1, IndexMap2 >
- algo(G1, G2, f, invariant1, invariant2, max_invariant, index_map1,
- index_map2);
- return algo.test_isomorphism();
- }
- namespace detail
- {
- template < typename Graph1, typename Graph2, typename IsoMapping,
- typename IndexMap1, typename IndexMap2, typename P, typename T,
- typename R >
- bool isomorphism_impl(const Graph1& G1, const Graph2& G2, IsoMapping f,
- IndexMap1 index_map1, IndexMap2 index_map2,
- const bgl_named_params< P, T, R >& params)
- {
- std::vector< std::size_t > in_degree1_vec(num_vertices(G1));
- typedef safe_iterator_property_map<
- std::vector< std::size_t >::iterator, IndexMap1
- #ifdef BOOST_NO_STD_ITERATOR_TRAITS
- ,
- std::size_t, std::size_t&
- #endif /* BOOST_NO_STD_ITERATOR_TRAITS */
- >
- InDeg1;
- InDeg1 in_degree1(
- in_degree1_vec.begin(), in_degree1_vec.size(), index_map1);
- compute_in_degree(G1, in_degree1);
- std::vector< std::size_t > in_degree2_vec(num_vertices(G2));
- typedef safe_iterator_property_map<
- std::vector< std::size_t >::iterator, IndexMap2
- #ifdef BOOST_NO_STD_ITERATOR_TRAITS
- ,
- std::size_t, std::size_t&
- #endif /* BOOST_NO_STD_ITERATOR_TRAITS */
- >
- InDeg2;
- InDeg2 in_degree2(
- in_degree2_vec.begin(), in_degree2_vec.size(), index_map2);
- compute_in_degree(G2, in_degree2);
- degree_vertex_invariant< InDeg1, Graph1 > invariant1(in_degree1, G1);
- degree_vertex_invariant< InDeg2, Graph2 > invariant2(in_degree2, G2);
- return isomorphism(G1, G2, f,
- choose_param(get_param(params, vertex_invariant1_t()), invariant1),
- choose_param(get_param(params, vertex_invariant2_t()), invariant2),
- choose_param(get_param(params, vertex_max_invariant_t()),
- (invariant2.max)()),
- index_map1, index_map2);
- }
- template < typename G, typename Index > struct make_degree_invariant
- {
- const G& g;
- const Index& index;
- make_degree_invariant(const G& g, const Index& index)
- : g(g), index(index)
- {
- }
- typedef typename boost::graph_traits< G >::degree_size_type
- degree_size_type;
- typedef shared_array_property_map< degree_size_type, Index >
- prop_map_type;
- typedef degree_vertex_invariant< prop_map_type, G > result_type;
- result_type operator()() const
- {
- prop_map_type pm = make_shared_array_property_map(
- num_vertices(g), degree_size_type(), index);
- compute_in_degree(g, pm);
- return result_type(pm, g);
- }
- };
- } // namespace detail
- namespace graph
- {
- namespace detail
- {
- template < typename Graph1, typename Graph2 > struct isomorphism_impl
- {
- typedef bool result_type;
- typedef result_type type;
- template < typename ArgPack >
- bool operator()(const Graph1& g1, const Graph2& g2,
- const ArgPack& arg_pack) const
- {
- using namespace boost::graph::keywords;
- typedef typename boost::detail::override_const_property_result<
- ArgPack, tag::vertex_index1_map, boost::vertex_index_t,
- Graph1 >::type index1_map_type;
- typedef typename boost::detail::override_const_property_result<
- ArgPack, tag::vertex_index2_map, boost::vertex_index_t,
- Graph2 >::type index2_map_type;
- index1_map_type index1_map
- = boost::detail::override_const_property(
- arg_pack, _vertex_index1_map, g1, boost::vertex_index);
- index2_map_type index2_map
- = boost::detail::override_const_property(
- arg_pack, _vertex_index2_map, g2, boost::vertex_index);
- typedef typename graph_traits< Graph2 >::vertex_descriptor
- vertex2_t;
- typename std::vector< vertex2_t >::size_type n
- = (typename std::vector< vertex2_t >::size_type)
- num_vertices(g1);
- std::vector< vertex2_t > f(n);
- typename boost::parameter::lazy_binding< ArgPack,
- tag::vertex_invariant1,
- boost::detail::make_degree_invariant< Graph1,
- index1_map_type > >::type invariant1
- = arg_pack[_vertex_invariant1
- || boost::detail::make_degree_invariant< Graph1,
- index1_map_type >(g1, index1_map)];
- typename boost::parameter::lazy_binding< ArgPack,
- tag::vertex_invariant2,
- boost::detail::make_degree_invariant< Graph2,
- index2_map_type > >::type invariant2
- = arg_pack[_vertex_invariant2
- || boost::detail::make_degree_invariant< Graph2,
- index2_map_type >(g2, index2_map)];
- return boost::isomorphism(g1, g2,
- choose_param(
- arg_pack[_isomorphism_map | boost::param_not_found()],
- make_shared_array_property_map(
- num_vertices(g1), vertex2_t(), index1_map)),
- invariant1, invariant2,
- arg_pack[_vertex_max_invariant | (invariant2.max)()],
- index1_map, index2_map);
- }
- };
- }
- BOOST_GRAPH_MAKE_FORWARDING_FUNCTION(isomorphism, 2, 6)
- }
- // Named parameter interface
- BOOST_GRAPH_MAKE_OLD_STYLE_PARAMETER_FUNCTION(isomorphism, 2)
- // Verify that the given mapping iso_map from the vertices of g1 to the
- // vertices of g2 describes an isomorphism.
- // Note: this could be made much faster by specializing based on the graph
- // concepts modeled, but since we're verifying an O(n^(lg n)) algorithm,
- // O(n^4) won't hurt us.
- template < typename Graph1, typename Graph2, typename IsoMap >
- inline bool verify_isomorphism(
- const Graph1& g1, const Graph2& g2, IsoMap iso_map)
- {
- #if 0
- // problematic for filtered_graph!
- if (num_vertices(g1) != num_vertices(g2) || num_edges(g1) != num_edges(g2))
- return false;
- #endif
- BGL_FORALL_EDGES_T(e1, g1, Graph1)
- {
- bool found_edge = false;
- BGL_FORALL_EDGES_T(e2, g2, Graph2)
- {
- if (source(e2, g2) == get(iso_map, source(e1, g1))
- && target(e2, g2) == get(iso_map, target(e1, g1)))
- {
- found_edge = true;
- }
- }
- if (!found_edge)
- return false;
- }
- return true;
- }
- } // namespace boost
- #ifdef BOOST_ISO_INCLUDED_ITER_MACROS
- #undef BOOST_ISO_INCLUDED_ITER_MACROS
- #include <boost/graph/iteration_macros_undef.hpp>
- #endif
- #endif // BOOST_GRAPH_ISOMORPHISM_HPP
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