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