It does not matter! The key is...

来源: 群众丁 于 2009-04-30 10:29:14 [] [旧帖] [给我悄悄话] 阅读数 : (254 bytes)
回答: 红色单位正方形问题解答 由 群众丁 于 2009-04-29 10:12:31

The colors of the diagonal squares do not matter. A non-red diagonal square needs to contact only one red square, and a red square needs to contact only one red square as well. The key is a diagonal square does not side-contact any other diagonal square.

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