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