<｜begin▁of▁sentence｜>### Instruction:
As a network data analyst, you're working on a project to analyze the Internet AS Graph to identify communities within the network. Your data is stored in a gml file named as-22july06.gml. You're exploring the possibility of using the greedy modularity community detection algorithm in the NetworkX library to perform community detection. Your goal is to save the discovered communities to a JSON file for further analysis and visualization.
### Response:
import networkx as nx
from cdlib import algorithms

# Create a graph from the Internet AS graph
G = nx.read_gml('as-22july06.gml')

# Apply the greedy modularity community detection algorithm
communities = algorithms.greedy_modularity(G)

# Saving the communities to a JSON file
with open('communities.json', 'w') as f:
    f.write(communities.to_json())
<|EOT|>
