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