code: def test_custom_multigraph3_different_labels(self):
      G1 = nx.MultiGraph()
  
      mapped = {1: 9, 2: 8, 3: 7, 4: 6, 5: 3, 8: 5, 9: 4, 7: 1, 6: 2}
      edges1 = [
          (1, 2),
          (1, 3),
          (1, 3),
          (2, 3),
          (2, 3),
          (3, 4),
          (4, 5),
          (4, 7),
          (4, 9),
          (4, 9),
          (4, 9),
          (5, 8),
          (5, 8),
          (8, 9),
          (8, 9),
          (5, 6),
          (6, 7),
          (6, 7),
          (6, 7),
          (5, 2),
      ]
  
      G1.add_edges_from(edges1)
      G2 = nx.relabel_nodes(G1, mapped)
  
      nx.set_node_attributes(
          G1, dict(zip(G1, it.cycle(labels_many))), "label"
      )
      nx.set_node_attributes(
          G2,
          dict(zip([mapped[n] for n in G1], it.cycle(labels_many))),
          "label",
      )
      m = vf2pp_isomorphism(G1, G2, node_label="label")
      assert m
      assert m == mapped
  
      # Delete edge maintaining isomorphism
      G1.remove_edge(4, 9)
      G2.remove_edge(4, 6)
  
      m = vf2pp_isomorphism(G1, G2, node_label="label")
      assert m
      assert m == mapped
  
      # Change edge orientation such that G1 mirrors G2
      G1.add_edges_from([(4, 9), (1, 2), (1, 2)])
      G1.remove_edges_from([(1, 3), (1, 3)])
      G2.add_edges_from([(3, 5), (7, 9)])
      G2.remove_edge(8, 9)
  
      m = vf2pp_isomorphism(G1, G2, node_label="label")
      assert not m
  
      # Make all labels the same, so G1 and G2 are also isomorphic
      for n1, n2 in zip(G1.nodes(), G2.nodes()):
          G1.nodes[n1]["label"] = "blue"
          G2.nodes[n2]["label"] = "blue"
  
      m = vf2pp_isomorphism(G1, G2, node_label="label")
      assert m
  
      G1.add_node(10)
      G2.add_node("Z")
      G1.nodes[10]["label"] = "green"
      G2.nodes["Z"]["label"] = "green"
  
      # Add different number of edges between the new nodes and themselves
      G1.add_edges_from([(10, 10), (10, 10)])
      G2.add_edges_from([("Z", "Z")])
  
      m = vf2pp_isomorphism(G1, G2, node_label="label")
      assert not m
  
      # Make the number of self-edges equal
      G1.remove_edge(10, 10)
      m = vf2pp_isomorphism(G1, G2, node_label="label")
      assert m
  
      # Connect the new node to the graph
      G1.add_edges_from([(10, 3), (10, 4)])
      G2.add_edges_from([("Z", 8), ("Z", 3)])
  
      m = vf2pp_isomorphism(G1, G2, node_label="label")
      assert m
  
      # Remove central node
      G1.remove_node(4)
      G2.remove_node(3)
      G1.add_edges_from([(5, 6), (5, 6), (5, 7)])
      G2.add_edges_from([(1, 6), (1, 6), (6, 2)])
  
      m = vf2pp_isomorphism(G1, G2, node_label="label")
      assert m
  
imports: import itertools
  import pytest
  import networkx
  from networkx import vf2pp_is_isomorphic, vf2pp_isomorphism
label_desc: Use image node_id 6 for calling the TestMultiGraphISOVF2pp obj's underlying member method code with example usage: obj.test_custom_multigraph3_different_labels() without return types