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