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