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