Answer: ABCDEFGHIJKLM

AnswerCrossword Clue
ABCDEFGHIJKLMFirst half of a series
ABCDEFGHIJKLMPart of a speller's repertoire
ABCDEFGHIJKLMPart of a sequence
ABCDEFGHIJKLMHalf of a decoder ring
ABCDEFGHIJKLMFirst half of things we all memorized