The "gallows" characters

[Davidsch]

Well, who/what  defines what is still a readable word in general ?
And how on earth do you define that for the Voynese words ?

I tried such a thing before and have so many examples what can be replaced 
in a word and in a sentence, that almost ANYTHING is possible.

So probably I am missing something essential here, or anything can be replaced by anything, see below.
In the last case, we can generate many other numbers.

Your program that generated the "valid" replacements has one or more rules defined based on position or cohesion?
 or do you simply replace ANY given letter?


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Just some examples:

The quick brown fox jumps over the lazy dog

Glue:
variation1: Thequick brownfox jumpsover thelazy dog
variation2: Thequickbrownfox jumpsoverthelazy dog
etc..

One or more letter replacement
1he quick brown fox jumps over 1he lazy dog
1he quic1 brown fox jumps over 1he lazy dog
1he quic1 brow1 fox jumps over 1he lazy dog
1he quic1 brow1 fo1 jump over 1he lazy dog
etc..

vowels:
Th1 qu1ck br1wn f1x j1mps 1v1r th1 l1zy d1g
etc. etc.

deletion/subtraction:
Th quck brwn fx jmps vr th lzy dg
variation1:
T_ quick brown fox jumps o_ t laz_ dog

random insertion:
The2 qu2ick br2own fox2 ju2mps ove2r 2the l2azy d2og
etc.

and many many more other possible variations