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