问题
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6/28,21/98,18/84,9/42,()A.25/60B.12/44C.12/56D.25/78
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21,28,33,42,43,60,() A.45 B.56 C.75 D.92
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6/28,21/98,18/84,9/42,() A.25/60B.12/44C.12/56D.25/78
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6/28,21/98,18/84,9/42,() A.25/60B.12/44C.12/56D.25/78
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21, 28, 33, 42, 43, 60, ().A.45B.56C.75 D.92
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21, 28, 33, 42, 43, 60, ().A.45B.56C.75 D.92