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