Zompist Bboard Again

How *did* it happen that Proto-Eastern *Endanor became Axunašin Inbamu? That d -> b change seems unlikely, and (maybe I'm missing something) but I don't see anything on the Proto-Eastern page that would suggest how this occurred.

Can confirm that the big-bright-pictures 1980s "how computer programming works" book I had when I was 5 or 6 assumed that we'd be using octal, although it also covered binary and hexadecimal. [and now, although computers are everywhere, children are no longer given doring kindersley books...