quicko: alphabetical license

Australian license plates cycle through the alphabet.  I really don't understand how this works, but my Australian friends seem to have an intrinsic idea of what letters are due to come out next, and in which state.  Right now nearly everyone in NSW has a license plate starting with either an A or a B, which is all well and good until you go to play the "let's make an acronym out of the letters" game in the car and find that all your sentences start with either "aunts" or "boys."  And really, some go downhill drastically fast from that B ...