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