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