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