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