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