2 2, 3 1, 4
3 3, 4 2, 5 1, 6
4 4, 5 3, 6 2, 7 1, 8
5 5, 6 4, 7 3, 8 2, 9 1, 10
6 6, 7 5, 8 4, 9 3, 10 2, 11 1, 12
4 2, 3 1, 4 4, 5 3, 6
6 3, 4 2, 5 1, 6 6, 7 5, 8 4, 9
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