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