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Which of the relations given by the following sets of
O {(5, 4), (4,3), (3, 2), (4, 5), (2, 1)}
O {(5,4), (5, 6), (5, 8), (5, 10), (5, 12)}
O {(1, 2), (-4, 8), (-3, 5), (1, - 2), (7, 12)}
O {(6, 1), (3, 1), (3, 5), (2, 4), (-1,2)}


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