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2. 費式序列 https://blog.csdn.net/u012675743/article/details/47312119.net
3.巴斯卡三角形 https://www.cnblogs.com/xxNote/articles/3965362.htmlhtm
4.三色旗 https://www.cnblogs.com/libra-yong/p/6296244.htmlblog