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EXAMPLE
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The a(1) = 1 through a(6) = 14 subsets:
{1} {1,2} {1,2} {1,3} {1,2,4} {1,2,4}
{1,3} {1,2,4} {1,2,5} {1,2,5}
{2,3} {2,3,4} {1,3,5} {1,2,6}
{2,3,4} {1,3,5}
{2,4,5} {1,3,6}
{3,4,5} {1,4,6}
{2,3,4}
{2,3,6}
{2,4,5}
{2,5,6}
{3,4,5}
{3,4,6}
{3,5,6}
{4,5,6}
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