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