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