T
I
d
k comes next, and then l.
d j f m a
K as in asdfghjk across you keyboard
T
I
what is the next sequence a, d, g, j
k
d
J
It's K!
k comes next, and then l.
I think it's M.B is the second letter, C is the third, D is the 4th. The difference between these letters is one. D-G is 3 and G-J is 3 so I'd assume that the next letter is the third after J which is M.2-3-4-7-10-13
The sequence alternates between skipping letters. Starting with "j," it skips "i" to "h," then skips "f" to "g," and skips "e" to "d." Following this pattern, the next letter after "d" would skip "c," resulting in "b."
G. J. D. Dalton has written: 'The beef and milk enterprise'
Check out the link for the sequence.