I think the approach should be be which color is likely to have one, which is white. Where could white not go. I position 6 bc it had to be directly below grew.

Vinny Gambini: this is the most understandable approach to this question for me. It has baffled my brain for the last two hours. I could not understand how -s -> -u when to be correct it would need to read s -> -u. When you explained that I needed to weaken their conclusion, and one way to do ...