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【简答题】
集合A={a 1 ,a 2 ,a 3 ,a 4 },R={(a 1 ,a 2 ),(a 2 ,a 3 ),(a 3 ,a 4 )},求r(s(R)),s(r(R)),t(s(R)),r(t(R)),t(r(R))。
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