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