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