Meursault, that's not what I meant, but I was very vague, so my meaning was unclear. I assume the highlighting of the three that span the removed item should include the empty cells, but perhaps not. If that is required, the perhaps the three other empty cells could be candidates for highlighting for reasons I gave earlier.
I still have memories of that gallows puzzle a while back, when it seemed obvious to me that the right thing to do was to draw the gallows with all the bits joined up. Instead, the official solution showed a DIY kit that would have fallen apart. I very nearly stopped sending in entries at that point.