The "gallows" characters

[Davidsch]

-job-

i am feeling stupid, because i do not understand your numbers on "replacement counts"

In Pliny's vocabulary, if we take a word containing an "m" and replace it with an "s", we get a valid word 7% of the time. There are other valid substitutions but they yield less than 5% - i'm only listing the most significant ones.

Bible (Latin):
m replaced by s: 136/1887 7.0%
o replaced by i: 107/1828 6.0%


"The following gives the percentage of words that are still valid after a character substitution, in some texts of roughly equivalent lengths"
Pliny:  m replaced by s: 213/3074 7.0%

What does this mean in plain English ?

What is the software you use for this analysis, what rules ?