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