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