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我死活不理解例子给的这个“3 (2): tie ”麻烦知道的高手一定给我解释，要不然我寝食难安我理解括号（2）应该是不同种类的邮票类型，可是给出的是2个1，应该是3个1才对，还是我理解错了应该和上面给出的1 2 3 0 ; three different stamp types接着能用吗？可是这样的话6就不是none了，我真是晕呀，知道的一定给我解答呀。多谢 Followed by: Post your reply here: |
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