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