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