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