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O, T, T, F, F, S, S, E, N, T, ?, ?, ?
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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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