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