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