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