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有一堆火柴梗,如果2根2根数,最后余1根;3根3根数,余2根;4根4根数,余3根;5根5根数,余4根。
There are a bunch of matchstick, if 2 2, the last remaining 1; 3 3, more than 2; 4 4, more than 3; 5 5, more than 4.