test 1 failed
expected:
11
1 1
1 2
1 2
1 2
4 4
4 6
4 9
4 9
8 9
9 9
9 9

got:
13
1 1
1 2
1 2
1 2
4 4
4 6
9 9
9 9
9 9
9 9
8 10
4 10
4 10