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