Starting with A, how many pairs of letters - in alphabetical order - can you think of that are reasonably familiar abbreviations or "short forms" of phrases?

(Possible) Answers:

AB - blood type
BC - before Christ
CD - compact disc
DE - Delaware
HI - Hawaii
MN - Minnesota
NO - opposite of yes and abbreviation for number
OP - opportunity, as in photo op
PQ - P's and Q's (manners)
ST - Abbreviation for Saint and street
UV - ultra violet
VW - Volkwagen
XY - gender-determining chromosomes