0
{9: 1, 19: 1}
{9: 1, 19: 1, 4: 1}
{9: 2, 19: 1, 4: 2, 1: 1, 10: 1}
{9: 1, 19: 1, 4: 2, 1: 1, 10: 2}
{9: 2, 19: 1, 4: 2, 1: 1, 10: 3, 7: 1, 11: 1}
3