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哦，谢谢二位，明白了:)

Posted by sothink at 2005-03-05 23:45:55 on Problem 2188
In Reply To:Re:请问为啥sample是4 而不是2呢，交换两次不就可以了么 Posted by:ArXoR at 2005-03-05 23:43:12 
> Since the cows have short arms they are limited to swapping ""adjacent"" pairs of wire endpoints on either the top or bottom holder.^_^
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