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例子
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a（1）=1到a（8）=14子集：
{1} {2} {3} {1,4} {3,5} {5,6} {1,6,7} {3,7,8}
{2,4} {4,5} {1,4,6} {2,5,7} {4,6,8}
{3,4} {1,2,5} {2,3,6} {2,6,7} {4,7,8}
{2,4,6} {3,4,7} {5,6,8}
{3,4,6} {3,5,7} {5,7,8}
{3,6,7} {6,7,8}
{4,5,7} {1,2,7,8}
{4,6,7} {1,3,6,8}
{5,6,7} {1,4,5,8}
{1,2,4,7}{2,3,5,8}
{2,3,6,8}
{2,4,5,8}
{3,4,5,8}
{1,2,3,4,8}
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