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