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