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