<｜begin▁of▁sentence｜>### Instruction:
As an artificial intelligence ethicist, you have been asked to analyze the network of astrophysics collaborations among researchers. You are required to use the head_tail function in the cdlib library to perform community detection with a head/tail division rule of 0.8 on the provided astrophysics collaboration graph, which can be read from a gml file named astro-ph.gml. After performing community detection, you need to generate and print a JSON representation of the resulting NodeClustering object. This analysis will help identify distinct communities within the astrophysics collaboration network.
### Response:
from cdlib import algorithms
import networkx as nx

G = nx.read_gml('astro-ph.gml')
coms = algorithms.head_tail(G, head_tail_ratio=0.8)
print(coms.to_json())
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