<｜begin▁of▁sentence｜>### Instruction:
Given two graphs where the first graph has 4 vertices connected in a single line (0-1-2-3) and the second graph has 3 vertices connected in a single line (0-1-2), can you use the count_subisomorphisms_vf2 function in igraph to determine the number of subisomorphisms between the first graph and the second graph?
### Response:
import igraph as ig

# Create first graph
g1 = ig.Graph()
g1.add_vertices(4)
g1.add_edges([(0,1), (1,2), (2,3)])

# Create second graph
g2 = ig.Graph()
g2.add_vertices(3)
g2.add_edges([(0,1), (1,2)])

# count the subisomorphisms
num_subisomorphisms = g1.count_subisomorphisms_vf2(g2)
print(f'Number of subisomorphisms: {num_subisomorphisms}')
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