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