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