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1-1
2-1
2-1
2-1
2-1
2-2
2-2
3-1
3-1
3-1
3-2
3-3
3-3
3-3
3-4
3-4
3-5
3-5
3-6
3-6
3-7
3-7
3-8
3-8
3-8
3-9
3-9
4-1