Shit. I'm not even sure if I remember the rule anymore. I think I know what it was, gimme a sec to run through the list and see.
EDIT: Yep, okay, I remember the rule now. Gimme a sec to dig up the app, now... (wonder if I still have that...?)
EDIT: Yes! Still got the tool too. (Wasn't sure, due to a computer replacement in the recent past; but that was obviously before I made the tool. Either that or I actually copied a random two-second throw-together app that's in a place I don't usually keep source code. xD)
White Koans
AAA ATE RARE RATE
AAAA ATG RASE SATE
AAAAA ATT RAT
Black Koans
ABC BAC RAG RAHE
ACB EAT RAGE SAGE
AGE GREAT RAGG TEAR