The evolution of P/F vs T/K raises important questions

[Mauro]

It is possibly arguable that Pch = Ke, and Pchedy = Kee, but I'm struggling to come up with an explanation for why this would occur.

In Herbal A I measure a distance of 0.14 between 'ke' and 'pch' on the distribution of the preceding character, so they are indeed rather similar. On the distribution of the following character they fare worse: 0.34. [minimum possible value = 0, maximum = 1.414, for reference k/t stand 0.07/0.11 apart, ch/sh are at 0.21/0.08

In Herbal B the distances between 'ke' and 'pch' are 0.31/0.21, so further apart than in Herbal A (though they are more similar according the following character).

In Bio/Balneo they are more dissimilar: 0.45/0.34


Note 1: Rf1a-n, all uncertain spaces are spaces, all words including a '?' have been removed.
Note 2: there are few 'pch' in the text, in Herbal A the most common is in 'pchor' with only 5 occurrences, in Herbal B it's 'ypchedy' with 7, in Bio/Balneo 'pchedy' with 17, so I'm not sure if those distances are statistically real or if they're just a random fluke.