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