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