What?!?!?!? Pattern!!!!!

Published: Nov 30, 1999
Riddle: Complete this pattern...
What other three letters with be added on to

OTTFFSS!!!!
Answer: etn because its goes 12345678910 in start of each number
What?!?!?!? pattern!!!!! Riddle Meme.
What?!?!?!? pattern!!!!! Riddle Meme.
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