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