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