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