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