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