Grouped W-Wing
A W-Wing whose strong link ends on a group of cells inside a box.
How it works on this board
A grouped strong link on 4 makes 1 true in at least one of the two bivalue cells
2
3
6
5
9
1
8
4
3
8
3
9
8
3
2
3
6
2
7
2
8
3
7
3
4
5
8
6
3
9
3
2
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