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