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