After I made the original set of Prime videos, I stumbled onto this approach to accomplish the same (albeit a little less "permanent") goal -- namely, allowing you to use multi-character variable names within the Prime's Solve app.
It would be a very short video if I did, because I know next to nothing about programming the Prime. The good news is that Eddie Shore has a good document available at drive.google.com/open?id=1SUllOMpjRor0k1gbOgk0hCarBTRgEpfR
