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