I have a code but it's UGLY. Just a quick dirty routine to suite my needs. It might not be 'plug-and-play' and would likely require some editing on your part. What you're asking for is very easy if your grid bubbles always have either "1, 2, 3...." or "A, B, C....". That's actually LISP's strong suite. If the grid bubbles start having prefix's, suffix's, dashes (like "2-1") or letters combined with numbers (e: A3), things start getting tricky. The code gets more complicated. But at the same time, using the code gets more complicated as well. Like how does the code know to either return "A4" after "A3" or "B3"...