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