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