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OI-codes/BZOJ/4455/data/8.in

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10 19
1 7
7 9
2 1
6 10
3 5
2 10
6 5
2 5
1 3
7 8
8 5
7 3
8 3
4 10
6 2
4 6
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7 2
9 1
10 2
5 7
9 6