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import networkx as nx
def test_is_at_free():
is_at_free = nx.asteroidal.is_at_free
cycle = nx.cycle_graph(6)
assert not is_at_free(cycle)
path = nx.path_graph(6)
assert is_at_free(path)
small_graph = nx.complete_graph(2)
assert is_at_free(small_graph)
petersen = nx.petersen_graph()
assert not is_at_free(petersen)
clique = nx.complete_graph(6)
assert is_at_free(clique)
line_clique = nx.line_graph(clique)
assert not is_at_free(line_clique)
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