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