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