Aphabetic letter pairs in words

EL - elementary

EM- demon

EN = enter

EO - neon

EP- Epoxy

EQ= obsequious

ER = hamburger

ES- Strawberries

ES = tresses

ET- Net

EU = queue

EV = nevermore

EW- Somewhat

EX - dexterous

EY - eye

EZ - mezzanine

FA = prefabricated

FB- halfback

FC: beefcake

FD = serfdom