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