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