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