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