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