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