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