将它的 2^m-2 个非空真子集 与 它补集的 2^(n-m)-1 个非空子集构成的并集 都与它相交。
将它的 2^m-2 个非空真子集 与 它补集的 2^(n-m)-1 个非空子集构成的并集 都与它相交。
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