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