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