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