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