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[Helmut Winkler]

It is one of the reasons that I think it means that the ms. is not a ciphre, but a plaintext and readable and understandable

This returns us to the question why the two would be mixed in a single line then.

Why not? I use different languages in the same line in my notes as well. I think it is one of the worst faults in Voynich research to suspect some deep secret whenever someone does not understand something, in most cases it is just lack of knowledge of the  subject in questuon (there are lots of examples in nearly every thread)