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