code: def large_no_separating_set_graph():
      edge_list = [("A", "B"), ("C", "A"), ("C", "B")]
      G = nx.DiGraph(edge_list)
      return G
  
imports: from itertools import combinations
  import pytest
  import networkx
label_desc: Use image node_id 14 for calling a global function with example usage: large_no_separating_set_graph() and returns: G