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