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