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