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