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