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