<｜begin▁of▁sentence｜>### Instruction:
Given a citation graph which you can read from graph_citation.gml, can you use the cocitation function in igraph to calculate the cocitation scores for the first three vertices and print the resulting matrix?
### Response:
from igraph import Graph

g = Graph.Read_GML('graph_citation.gml')

# Select a list of vertex indices to calculate cocitation for, here we select first three vertices
vertices_to_analyze = [0, 1, 2]

# Calculate cocitation scores
cocitation_scores = g.cocitation(vertices=vertices_to_analyze)

# Print the cocitation matrix
print(cocitation_scores)
<|EOT|>
