<｜begin▁of▁sentence｜>### Instruction:
As a virtual assistant, a client has requested assistance with conducting community detection on a network graph representing American College football teams. The graph is stored in a GML file named football.gml. The requirement is to use the 'overlapping_seed_set_expansion' function from the cdlib library to perform overlapping community detection and then provide a JSON representation of the detected community structure.
### Response:
import networkx as nx
from cdlib import algorithms

# Load the American College football graph
G = nx.read_gml('football.gml')

# Define seed nodes, arbitrarily selected for the example
seeds = [0, 1, 2]

# Apply the overlapping seed set expansion algorithm
communities = algorithms.overlapping_seed_set_expansion(G, seeds=seeds, ninf=True, expansion='ppr', stopping='cond')

# Generate a JSON representation of the community structure
communities_json = communities.to_json()

print(communities_json)
<|EOT|>
