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