>>/19999/
Q obviously thought it would be too easy if the third blank was filled in:
CAAJ
CABJ
CACJ
CADJ
CAEJ
CAFJ
CAGJ
CAHJ
CAIJ
CAJJ
CAKJ
CALJ
CAMJ
CANJ
CAOJ
CAPJ
CAQJ
CARJ
CASJ
CATJ
CAUJ
CAVJ
CAWJ
CAXJ
CAYJ
CAZJ
Which one is it??

My only new thought:
Could "J" stand for "Jr"?