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