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