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