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