no, Y usually only exchange with X on a region called SAR


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送交者: xh 于 2006-1-19, 00:48:05:

回答: 这样计算对吗？ 由 trus 于 2006-1-19, 00:34:43:

Other part of Y is unique, usually kept intact except some rare transpositions or internal inversions, duplications.


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