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