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