Either show the following relations on {0, 1, 2, 3} is an equivalence relation, or show  which qualities of an equivalence relation it lacks:  a. {(0, 0), (1, 1), (1, 2), (2, 1), (2, 2), (3, 3)}  b. { (0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (1, 2), (2, 0), (2, 2), (3, 3)}

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