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OI-codes/S2OJ/1910/data/qiandao4.in

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8 5 20 2
8 2
4 4
1 4
4 3
6 2
5 4
2 5
5 2
1 4
5 2
8 4
6 1
3 4
4 3
6 3
4 5
7 4
6 4
4 1
2 2