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