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