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