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