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