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