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例子
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a（0）=1到a（6）=17子集：
{} {1} {1,2} {1,2} {1,2,4} {1,2,4} {1,2,4}
{1,3} {1,3,4} {1,2,5} {1,2,5}
{2,3} {2,3,4} {1,3,4} {1,2,6}
{1,3,5} {1,3,4}
{2,3,4} {1,3,5}
{2,3,5} {1,3,6}
{2,4,5} {1,4,6}
{3,4,5} {1,5,6}
{2,3,4}
{2,3,5}
{2,3,6}
{2,4,5}
{2,5,6}
｛3，4，5｝
{3,4,6}
{3,5,6}
{4,5,6}
a（0）=1到a（6）=17套系统：
{1} {1}{2} {1}{2} {1}{2}{3} {1}{2}{3} {1}{2}{3}
{1}{12} {1}{12}{3} {1}{12}{3} {1}{12}{3}
{2}{12} {2}{12}{3} {1}{2}{13} {1}{2}{13}
{2}{12}{3} {1}{2}{23}
{2}{3}{13} {1}{3}{23}
{1}{12}{13} {2}{12}{3}
{12}{3}{13} {2}{3}{13}
{2}{12}{13} {1}{12}{13}
{1}{12}{23}
{1}{13}{23}
{12}{3}{13}
{12}{3}{23}
{2} ｛12｝｛13｝
{2}{12}{23}
{2}{13}{23}
{3}{13}{23}
{12}{13}{23}
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