A . A、Y1-RQ-Y2，RQ-Y3-Y4，Y5-Y6-Y7B . B、Y1-a-Y2，a-Y3-Y4，Y5-Y6-Y7C . C、Y1-a-Y2，Y3-Y4-Y5，a-Y6-Y7D . D、Y1-RQ-Y2，Y3-Y4-Y5，QR-Y6-Y7
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