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现有下图左边所示的“四连方”纸片五种，每种的数量足够多，要在如下图右边所示的5×5方格网上，放“四连方”，“四连方”可以翻转，四连方的每个小方格都要与方格网的某个小方格重合，任意两个“四连方”不能有重叠部分，那么最少放几个“四连方”就不能再放了？
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举一反三
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