Answer: efg

AnswerCrossword Clue
EFGD train?
EFGDH link
EFGThree of 26
EFGD-H run
EFGAlphabetic chain
EFGFifth, sixth, and seventh of a series
EFGString after D
EFGH lead-in
EFGCD followers
EFGD followers
EFGTrio after D
EFGLetter trio
EFGAlphabetic run
EFGThree of a scale
EFGBetween D and H
EFGAlphabet run
EFGD-H link
EFGAlphabetic trio
EFGThey precede HI
EFGAlphabetical run
EFGRun after D
EFGAlphabet trio
EFGD-H linkup
EFGD-H filler
EFGCD trailers
EFGAlphabetical trio
EFGThree after D
EFGD-H connection