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4Â¥: Originally posted by hank612 at 2014-01-09 00:26:11
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qy_fighting: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2014-01-09 23:04:05
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2Â¥: Originally posted by qy_fighting at 2014-01-06 23:55:22
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k[x,y]/(x^2-y^2).
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