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{1,2},{1,3},{1,4},{1,5},{1,6}
{2,3},{2,4},{2,5},{2,6}
{3,4},{3,5}{3,6}
{4,5},{4,6},
{5,6}
{1,2,3},{1,2,4},{1,2,5},{1,2,6}
{1,3,4},{1,3,5},{1,3,6}
{1,4,5},{1,4,6}
{1,5,6}
{2,3,4},{2,3,5},{2,3,6}
{2,4,5}{2,4,6}
{2,5,6}
{3,4,5},{3,4,6}
{3,5,6}
{4,5,6}