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{1,3,1,2,4,5} {1} {1,2,3,4,5} {2,3,4,5}
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{3,4,5,6,7,8} {5,8} {3,5,7,8} {4,5,6,8}
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={1,2,3}, ={3,4,5},则 (A.){1,2,3,4} (B.){1,2,4,5} ( ){1,2,5} ( ){3}