sh_ and ch_ compose the same words

[nickpelling]

What a complex set of rules you posit were necessary to generate a meaningless text! EVA ee can follow ch and sh (indeed, this is almost mandated in B pages), but the almost-visually-identical ch and sh cannot. And we haven't even considered here the issue of why eech and eesh should be so rare.

At the core of Voynichese's behaviour lie a number of sets of deep-rooted adjacency asymmetries, of which the ch/sh complex is just one. Whatever the actual reason for those asymmetries, the claim that they are simply due to some kind of shape harmony seems to me to be grossly inadequate.