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