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a=513+n,b=513+n-1 c=513-n-1 and d=513-n-2. 1<=n<=511. I lik

皆兄弟也 2010-10-12 15:33:34 ( reads)

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jinjing

2010-10-12 16:21:40

Thanks.For integer,I draw a snake with feet. 1<=n, OK.