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例子
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a(3)=1到a(6)=13个简单图的代表:
{12,13,23} {12,13,14,23} {12,13,14,15,23} {12,13,14,15,16,23}
{12,13,24,34} {12,13,14,23,25} {12,13,14,15,23,26}
{12,13,14,23,45} {12,13,14,15,23,46}
{12,13,14,25,35} {12,13,14,15,26,36}
{12,13,24,35,45} {12,13,14,23,25,36}
{12,13,14,23,25,46}
{12,13,14,23,45,46}
{12,13,14,23,45,56}
{12,13,14,25,26,35}
{12,13,14,25,35,46}
{12,13,14,25,35,56}
{12,13,14,25,36,56}
{12,13,24,35,46,56}
(结束)
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