What are the next 3 letters in this series? O,T,T,F,F,S,S,E,N,T,?,?,?
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The next 3 letters in the sequence are E,T,T
The letters represent the first letter of the numbers 1 through 13. One, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Eleven, Twelve, Thirteen.
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