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