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