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例子
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a（3）=49边缘组：
{} {12} {12,13} {12,13,21} {12,13,21,23}
{13} {12,21} {12,13,23} {12,13,21,31}
{21} {12,23} {12,13,31} {12,13,23,32}
{23} {12,31} {12,13,32} {12,13,31,32}
{31} {12,32} {12,21,23} {12,21,23,32}
{32} {13,21} {12,21,31} {12,21,31,32}
{13,23}{12,21,32}{13,21,23,31}
{13,31} {12,23,32} {13,23,31,32}
{13,32} {12,31,32} {21,23,31,32}
{21,23} {13,21,23}
{21,31} {13,21,31}
{21,32} {13,23,31}
{23,31} {13,23,32}
｛23，32｝｛13，31，32｝
{31,32} {21,23,31}
{21,23,32}
{21,31,32}
{23,31,32}
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