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