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0. When A = {1, 2, 3, 4, 5} and r defined on A by xry if x + 1 = y, then r3 is
{(1, 3) (2, 4)}
{(1, 3) (2, 5)}
{(1, 4) (2, 5)}
{(1, 4) (4, 5)}
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