ch and sh as dual-function elements

[Labyrinthinesecurity]

I've noticed a pattern with your posts in that you appear to identify some property using statistical or ML algorithms and then confirm the presence or absence of this property via permutation testing. I'm not sure these are valid results. Given a purely random sequence one can identify many features that are just the properties of this particular random sequence. When the sequence is shuffled, the features are gone, but this doesn't mean there was any significance in these features in the first place.

A quick practical example, I have a python script that prints a random string of 50 lowercase characters and then prints a permutation of the same string.

I ran it and the first resulting string (the Original) was:

ehzcjusashtecbfuzjsrjgnyzoqqpeyvfnhzxbechhffwsddvp

Ok, I see "a feature" - there are three instances of double characters here clustered at the second half of the string, two of them near the very end. I can try to "confirm", that this is "a real feature", by looking at the second string (same letter, different order):

tazfscebzpogehufvwfnhyehnjurchzzbqvfqdcjsephdsxyjs

Now, there is only one instance of a double character here, a decrease of 66.6%! Interesting? Not really, because the fact is these are just two random strings made of the same letters in a completely random fashion.

The Voynich Manuscript is a fixed artifact with a certain sequence of characters. There may be reason for some of the properties of this sequence and there is definitely no reason at all for some other properties of this sequence. If a certain property is lost after shuffling the data, this by itself is not a proof of anything.

The tail/no-tail distinction is not something extracted from the text itself. It is an independently observable physical property of the manuscript, otherwise of course it would be fatal. So I think it makes the permutation results not circular, unlike maybe many similar claims on the manuscript?