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