O T T F F

What are the next two letters in this sequence?

O T T F F _ _

Spoiler

S S … each letter corresponds to the first letter of each number starting from 1, 2, 3, …

i.e. One, Two, Three, Four, Five, Six, Seven

2 responses to “O T T F F”

  1. This is a nice one 🙂

  2. OTTFFSS
    ONE , TWO, THREE, FOUR, FIVE, SIX, SEVEN

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