Question regarding the ITA2 “Baudot” code…

Published on 2011-12-22 by Mark VandeWettering

While looking at the hadie high altitude balloon project, I got to thinking about making a microcontroller that could send RTTY. I knew that traditional Baudot (more properly the ITA2 code) was a five bit code with codes designed to switch back and forth between “letters” and “figures”, but I had never looked at the actual matrix. Here is the diagram from Wikipedia:

Tell me, is there ANY rhyme or reason to this layout? It literally looks like they just scattered the letters and numbers onto the codes more or less completely at random.

I was just curious: can anyone tell me what I am missing?