T
E
D
k comes next, and then l.
d
the letter E
g.
E
I is the next letter.
It's the letter D of course! Haven't you heard of Jason D?!
The next term is ' D '.
The series alternates between letters from the beginning of the alphabet and letters from the end, specifically pairing 'a' with 'z', 'b' with 'y', 'c' with 'x', and 'd' with 'w'. Following this pattern, after 'd', the next letter should be 'w'. Hence, the next letter in the series is 'w'.
D
k comes next, and then l.
d
The next (and last) letter is C. Just as a countdown counts backwards, this series is "countdown" spelled backwards.
d
d