<｜begin▁of▁sentence｜>### Instruction:
Given the condensed matter collaborations 2005 graph read from the GML file named cond-mat-2005.gml, can you use the Walktrap community detection algorithm provided by cdlib to detect communities within the network? Additionally, can you provide a JSON representation of the detected community structure?
### Response:
import networkx as nx
from cdlib import algorithms

# Read the graph from the GML file
G = nx.read_gml('cond-mat-2005.gml')

# Apply the Walktrap community detection algorithm
communities = algorithms.walktrap(G)

# Convert the community structure to a JSON representation
communities_json = communities.to_json()

# Print the JSON representation
print(communities_json)
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