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