ltrba tlrba lrtba rltba trlba rtlba ltbra tlbra lbtra bltra tblra btlra lrbta rlbta lbrta blrta rblta brlta trbla rtbla tbrla btrla rbtla brtla ltrab tlrab lrtab rltab trlab rtlab ltarb tlarb latrb altrb talrb atlrb lratb rlatb lartb alrtb raltb arltb tralb rtalb tarlb atrlb ratlb artlb ltbar tlbar lbtar bltar tblar btlar ltabr tlabr latbr altbr talbr atlbr lbatr blatr labtr albtr baltr abltr tbalr btalr tablr atblr batlr abtlr lrbat rlbat lbrat blrat rblat brlat lrabt rlabt larbt alrbt ralbt arlbt lbart blart labrt albrt balrt ablrt rbalt bralt rablt arblt barlt abrlt trbal rtbal tbral btral rbtal brtal trabl rtabl tarbl atrbl ratbl artbl tbarl btarl tabrl atbrl batrl abtrl rbatl bratl rabtl arbtl bartl abrtl
Note: these 'words' (valid or invalid) are all the permutations of the word ltrba. These words are obtained by scrambling the letters in ltrba.