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