1和2 1和3 1和4 1和5 1和6 1和7 1和8 1和9
2和3 2和4 2和5 2和6 2和7 2和8 2和9
3和4 3和5 3和6 3和7 3和8 3和9
4和5 4和6 4和7 4和8 4和9
5和6 5和7 5和8 5和9
6和7 6和8 6和9
7和8 7和9
8和9 所以这样有36种 依次这样排
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