# No. 3: What's the next in this letter sequence?

Part of a series of similar puzzles - the answer to one will give you the type of thinking required for the others.

What's the next letter in this series? What's the relationship?

u
d
t
c
c
s
s
o
n
d
o
d
t


To be explicit, note the knowledge tag below.

• Did you come up with this sequence yourself? – micsthepick Oct 22 '17 at 20:45
• The question is my own - the sequence should be at least familiar to around 400 million people – eedrah Oct 22 '17 at 21:32