"The Currier languages revisited" revisited

[MarcoP]

I find the subject of an A/B switch vs a progressive drift very interesting. It would be great if this problem could get a clear answer.
I hadn't previously realized that Scribe 4 apparently played a major role in the A/B transition or switch.

As always, it is likely I made errors, but I tried computing the frequency of the bigram ‘ed’ in each zodiac page. It’s lucky that the order of these pages is known. I processed Circle and Label text both separately and together. As a reference, the average frequency of 'ed' in Currier B is ~4%.