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