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