Unique Loop Type 4
A loop in two digits with a strong link in one of them, so the other digit goes from those two cells.
How it works on this board
5 is a strong link inside the loop
2
1
9
5
7
1
2
3
8
7
2
5
1
4
4
9
1
7
1
8
4
8
7
4
3
5
9
8
4
1
2
4
5
3
4
5
6
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