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