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