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