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