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規律是:111---表示前一個數“1”是1個1;21---表示前一個數“11”是由2個1組成;1211---表示前一個數“21”是由1個2、1個1組成;111221---即11 12 21,表示前一個數“1211”是依次由1個1,1個2,2個1組成;所以下一個是312211回答完畢
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