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