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Discussion of Problem 1631. Drunk King 2

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How to prove the formula?Alexey Dergunov [Samara SAU]1631. Drunk King 27 Jul 2014 04:412  
dEpicFail1631. Drunk King 28 Nov 2010 19:138  
9*9?freedevc1631. Drunk King 215 Apr 2010 23:552  
9*7Dreik1631. Drunk King 229 Oct 2008 23:514  

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