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Puzzle ZIRB 


??

What are the next three letters in this sequence:
HDD
TMRUTC
TCSO
TMRD

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Answer
HDD.

The initial letters from the nursery rhyme, Hickory Dickory Dock.
Hickory, dickory, dock,
The mouse ran up the clock,
The clock struck one,
The mouse ran down,
Hickory, dickory, dock.