code: def test_monomorphism_edge_match():
      G = nx.DiGraph()
      G.add_node(1)
      G.add_node(2)
      G.add_edge(1, 2, label="A")
      G.add_edge(2, 1, label="B")
      G.add_edge(2, 2, label="C")
  
      SG = nx.DiGraph()
      SG.add_node(5)
      SG.add_node(6)
      SG.add_edge(5, 6, label="A")
  
      gm = iso.DiGraphMatcher(
          G, SG, edge_match=iso.categorical_edge_match("label", None)
      )
      assert gm.subgraph_is_monomorphic()
  
imports: import importlib.resources
  import os
  import random
  import struct
  import networkx
  from networkx.algorithms import isomorphism
label_desc: Use image node_id 9 for calling a global function with example usage: test_monomorphism_edge_match() without return types