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