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