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the solution:
3
1
6
2
7
5
4
8
9
7
5
9
1
4
8
2
3
6
8
2
4
9
6
3
1
5
7
6
8
7
5
9
1
3
4
2
2
9
3
7
8
4
5
6
1
1
4
5
3
2
6
9
7
8
4
7
1
6
5
2
8
9
3
5
6
2
8
3
9
7
1
4
9
3
8
4
1
7
6
2
5