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