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