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