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3. Suppose relation R(A,B,C) has the tuples: . B A 1 3 4 3 4 6 2 5 3 1 2 6 and relation S(A,B,C) has the tuples: B N NN 2 5 3 2 5 4 4 5 6 1 2 3 Compute (R-S) U (S-R), often called the "symmetric difference" of Rand S