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