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