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