I is the next letter.
SEOCNODEJAFE SE---September OC---October NO---November DE---December JA---January FE---February The next sequence will be FE for February.
A, e, b, f#, c#
f
e
E dEsEr....E
e
G comes next in the musical note sequence. After G, the sequence starts again at A.
I is the next letter.
e
S eventy E ighty N inety
m
d
l
G
E
The sequence after e f h I s is not standard or clear. Additional context or information is needed to determine the pattern or next item in the sequence.