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