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