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