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