{1: 1, 18: 1}
13 18
{1: 2, 18: 1, 13: 2}
{1: 2, 18: 2, 13: 3, 9: 3, 20: 1}
16 18
{1: 2, 18: 2, 13: 4, 9: 4, 20: 1, 5: 3, 16: 4}
{1: 2, 18: 3, 13: 5, 9: 5, 20: 1, 5: 3, 16: 5}
{1: 2, 18: 3, 13: 5, 9: 6, 20: 1, 5: 3, 16: 5, 8: 4}
{1: 2, 18: 3, 13: 5, 9: 6, 20: 1, 5: 3, 16: 5, 8: 4, 11: 7}
{1: 2, 18: 4, 13: 5, 9: 6, 20: 1, 5: 3, 16: 5, 8: 4, 11: 7, 17: 6}
10 11
{1: 2, 18: 4, 13: 5, 9: 7, 20: 1, 5: 4, 16: 5, 8: 5, 11: 7, 17: 6, 10: 7}
19 20
{1: 2, 18: 5, 13: 6, 9: 8, 20: 1, 5: 4, 16: 6, 8: 5, 11: 8, 17: 7, 10: 8, 19: 5}
8