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Discussion of Problem 1609. Tram Tile

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But how to solve this problem??caoqinxiang1609. Tram Tile10 May 2018 13:466  
Could you tell me how to solve this problem?yuyan1609. Tram Tile21 Jan 2009 12:541  
Give some Hint,pleaseolao1609. Tram Tile29 Apr 2008 21:221  
How to prove that...DK [Samara SAU 1: X2008]1609. Tram Tile27 Apr 2008 02:013  

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