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请教一个搜索题,急!!!

Posted by relive_7 at 2009-07-23 16:34:15
1  2
 34
 56
7  8

共8个方格,用1-8这8个数字填充刚方格
使得 
1、2、3、4 这4个方格和为 18
5、6、7、8 这4个方格和为 18
1、3、5、7 这4个方格和为 18
2、4、6、8 这4个方格和为 18
1、3、6、8 这4个方格和为 18
2、4、5、7 这4个方格和为 18

如何进行搜索,请大家赐教。

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