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I have lines_list_copy of the form:
[['a1', 'b1', 'c1', 'd1', 'e1'], ['a2', 'b2', 'c2', 'd2', 'e2'], ... ]
I needed to remove all duplicate entries where a,b,c,d are identical. So note that I don't care about what value e has. So for example, If lines_list_copy = [['a1', 'b1', 'c1', 'd1', 'e1...