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