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I did a quick spot-check and found out that a couple of letters have been replaced by similar looking letters from other alphabets:
a = а (Cyrillic small letter a)
o = ο (Greek small letter omicron)
u = υ (Greek small letter ypsilon)
v = ν (Greek small letter nu)
Since they were consistently replaced throughout the sample, they're probably not used for watermarking, unless the author replaced other letters in the epub versions sold by other sites.
Whatever the motivation, it's a stupid idea, because it'll prevent readers from looking up words.
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