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I am unsure if this is the fastest way to test if LineStrings cross each other. Is there a better method.

for line_1, line_2, in itertools.combinations(lines, 2):
    crosses = line_1.crosses(line_2)
    if crosses is True:
         print(line_1, line_2)

Obviously this gets pretty slow with large files, I have found maybe loading it into an rtree index may speed this up.

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