E. the grey ball has (M, T, B, M, T, B) repitition. The black ball bounds in the tunnel for 1, 2, 3, ... grid
回复:图形逻辑
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• 回复:回复:图形逻辑 -216mancheng- ♂ (212 bytes) () 11/01/2010 postreply 10:50:20
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