Next letter

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A nice short puzzle, perfect for posing at the start of class.

Puzzle

What are the next letters in the sequence: O T T F F S S E?

Help

Hint
The next letter is N
Answer
N T E T T ...
Solution
The letters in the sequence are the initials of the natural numbers: One, Two, Three, etc. So the sequence continues: N T E T T F F S S E N T.