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