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