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