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