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