Mmm, I notice the veteran cashiers at the local grocery have EVERY produce code memorized. I mean, you could go through there with some tamarind pods or tomatillos and they'll just know the code for it. They got nothing to do but sit there, swipe stuff through the laser scanner and memorize every piece of inventory the store has. I bet if they just had numeric codes and not laser scanners, it wouldn't take them all that long to memorize the codes for every piece of inventory. A few months at most. But for some reason, they'd still have to call for a price check on tampons when you're in there buying them for your girlfriend.