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