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OI-codes/S2OJ/1910/data/qiandao3.in

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