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OI-codes/S2OJ/217/data/post3.in
2022-05-29 07:47:12 +08:00

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20
1 2
2 3 5
3 7 8 Q
1 6
2 8 7
1 X
2 9 10
2 10 9
3 11 X 13
2 11 13
2 14 15
1 T
2 15 14
4 17 A B 16
2 17 16
3 M 19 20
3 20 N 19
1 Z
2 20 Y
1 U