burds ubrds bruds rbuds urbds rubds budrs ubdrs bdurs dburs udbrs dubrs brdus rbdus bdrus dbrus rdbus drbus urdbs rudbs udrbs durbs rdubs drubs bursd ubrsd brusd rbusd urbsd rubsd busrd ubsrd bsurd sburd usbrd subrd brsud rbsud bsrud sbrud rsbud srbud ursbd rusbd usrbd surbd rsubd srubd budsr ubdsr bdusr dbusr udbsr dubsr busdr ubsdr bsudr sbudr usbdr subdr bdsur dbsur bsdur sbdur dsbur sdbur udsbr dusbr usdbr sudbr dsubr sdubr brdsu rbdsu bdrsu dbrsu rdbsu drbsu brsdu rbsdu bsrdu sbrdu rsbdu srbdu bdsru dbsru bsdru sbdru dsbru sdbru rdsbu drsbu rsdbu srdbu dsrbu sdrbu urdsb rudsb udrsb dursb rdusb drusb ursdb rusdb usrdb surdb rsudb srudb udsrb dusrb usdrb sudrb dsurb sdurb rdsub drsub rsdub srdub dsrub sdrub
Note: these 'words' (valid or invalid) are all the permutations of the word burds. These words are obtained by scrambling the letters in burds.