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感觉题目表述有点问题1 1 0 ; a new set of stamps (two of the same type) 不知道算不算吹毛求疵，但是应该是 two types of denomination吧，虽然一般都这么理解，但是总有点怀疑。 那个括号里的数字下面有人问了，我也觉得奇怪3对应的tie也需要3张，难道不是指张数？ Followed by:
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