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例子
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a(0)=1到a(5)=11图的非同构表示(未显示空列):
{} {12,13,23} {12,13,24,34} {12,13,24,35,45}
{13,14,23,24,34} {12,14,25,34,35,45}
{12,13,14,23,24,34} {12,15,25,34,35,45}
{13,14,23,24,35,45}
{12,13,24,25,34,35,45}
{13,15,24,25,34,35,45}
{14,15,24,25,34,35,45}
{12,13,15,24,25,34,35,45}
{14,15,23,24,25,34,35,45}
{13,14,15,23,24,25,34,35,45}
{12,13,14,15,23,24,25,34,35,45}
(结束)
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