sh_ and ch_ compose the same words

[nickpelling]

You discussed Voynichese words containing both ch  and sh, true: but there you also asserted that ch and sh are constrained by the shape of the characters next to them. I find this hard to understand, given that ch and sh have such a strong affinity for being followed by e and ee, yet have such a strong phobia for being followed by sh and ch.

I'm therefore not sure I can accept this kind of shape-driven argument when ch and ee have such similar shapes.