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