<｜begin▁of▁sentence｜>### Instruction:
As a wind turbine technician, you have been tasked with analyzing the social network of Les Miserables characters to identify communities within the network. The network graph is available in a GML file named 'lesmis.gml'. You are required to utilize the walktrap function in the cdlib library to perform community detection. Following this, you need to convert the resulting communities into a JSON format for further analysis and reporting.
### Response:
import networkx as nx
from cdlib import algorithms

# Load the Les Miserables graph
g = nx.read_gml('lesmis.gml')

# Perform community detection using the Walktrap method
communities = algorithms.walktrap(g)

# Convert communities to JSON
communities_json = communities.to_json()

print(communities_json)
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