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例子
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a（1）=1到a（8）=12个子集：
{1} {1,2} {1,3} {1,2,4} {1,2,5} {1,2,6} {1,2,7} {1,3,8}
{2,3} {2,3,4} {1,3,5} {1,3,6} {1,3,7} {1,5,8}
{2,4,5} {1,4,6} {1,4,7} {5,7,8}
{3,4,5} {2,3,6} {1,5,7} {1,2,4,8}
{2,5,6} {2,3,7} {1,4,6,8}
{3,4,6} {2,4,7} {2,3,4,8}
{3,5,6} {2,6,7} {2,4,5,8}
{4,5,6}{4,5,7}{2,4,7,8}
{4,6,7} {3,4,6,8}
{3,5,6,7} {3,6,7,8}
{4,5,6,8}
{4,6,7,8}
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