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