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