<｜begin▁of▁sentence｜>### Instruction:
As a screenwriter working on a crime drama series, the storyline involves two interconnected criminal networks represented by graph G1 and G2. The edge sets [(0, 1), (1, 2), (2, 0)] and [(0, 1), (1, 2), (2, 3), (3, 0)] encapsulate the relationships between the criminal organizations. To authenticate the script's accuracy, the production team needs to use the count_isomorphisms_vf2 function provided by networkx to determine the number of isomorphisms between these two criminal networks, ensuring the depiction of their connections is realistic.
### Response:
from igraph import Graph

# Define two graphs to compare
edges_g1 = [(0, 1), (1, 2), (2, 0)]
edges_g2 = [(0, 1), (1, 2), (2, 3), (3, 0)]
g1 = Graph(edges=edges_g1)
g2 = Graph(edges=edges_g2)

# Use count_isomorphisms_vf2 to determine the number of isomorphisms
num_isomorphisms = g1.count_isomorphisms_vf2(g2)
print(f'Number of isomorphisms: {num_isomorphisms}')
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