{0}
{0, 1}
{0, 1, 3}
{0, 1, 3, 4}
{0, 1, 3, 4, 7}
{0, 1, 3, 4, 7, 8}
{0, 1, 3, 4, 7, 8, 9}
{0, 1, 3, 4, 7, 8, 9, 6}
{0, 1, 3, 4, 7, 8, 9, 6, 5}
0 9 11 10 17 18 23 18 20 22