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