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