frabs rfabs farbs afrbs rafbs arfbs frbas rfbas fbras bfras rbfas brfas fabrs afbrs fbars bfars abfrs bafrs rabfs arbfs rbafs brafs abrfs barfs frasb rfasb farsb afrsb rafsb arfsb frsab rfsab fsrab sfrab rsfab srfab fasrb afsrb fsarb sfarb asfrb safrb rasfb arsfb rsafb srafb asrfb sarfb frbsa rfbsa fbrsa bfrsa rbfsa brfsa frsba rfsba fsrba sfrba rsfba srfba fbsra bfsra fsbra sfbra bsfra sbfra rbsfa brsfa rsbfa srbfa bsrfa sbrfa fabsr afbsr fbasr bfasr abfsr bafsr fasbr afsbr fsabr sfabr asfbr safbr fbsar bfsar fsbar sfbar bsfar sbfar absfr basfr asbfr sabfr bsafr sbafr rabsf arbsf rbasf brasf abrsf barsf rasbf arsbf rsabf srabf asrbf sarbf rbsaf brsaf rsbaf srbaf bsraf sbraf absrf basrf asbrf sabrf bsarf sbarf
Note: these 'words' (valid or invalid) are all the permutations of the word frabs. These words are obtained by scrambling the letters in frabs.