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