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