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