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