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