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