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