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