?
As oou oan oee, oy poinoer oepoacos eoero thord oetoer oito tho leoteo 'o'.
How mony oifoeront oetoero haoe boen oepoacod?
Puzzle Copyright © Kevin Stone
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Answer
15 different letters: acdefhilmrstvwy.
Reasoning
The sentences should read:
As you can see, my printer replaces every third letter with the letter 'o'.
How many different letters have been replaced?