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