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