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例子
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a(4)=28边缘组:
{13,24} {12,13,24} {12,13,14,23} {12,13,14,23,24} {12,13,14,23,24,34}
{14,23} {12,14,23} {12,13,14,24} {12,13,14,23,34}
{13,14,23} {12,13,23,24} {12,13,14,24,34}
{13,14,24} {12,13,24,34} {12,13,23,24,34}
{13,23,24} {12,14,23,24} {12,14,23,24,34}
{13,24,34} {12,14,23,34} {13,14,23,24,34}
{14,23,24} {13,14,23,24}
{14,23,34} {13,14,23,34}
{13,14,24,34}
{13,23,24,34}
{14、23、24、34}
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