Riddle

What is the next 3 letters in this riddle?
o t t f f s s _ _ _


I will give the answer tommorrow. If someone answers it before then, they get an avatar that says "Riddle-King".
 
Originally posted by Tom McDonnell
e n t

What is the reasoning behind this?

I see a pattern of three double letters, so therefore three singles - fair enough.

But I don't get the secondary pattern that dicates what the letters change to - help?
 
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