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