drabs rdabs darbs adrbs radbs ardbs drbas rdbas dbras bdras rbdas brdas dabrs adbrs dbars bdars abdrs badrs rabds arbds rbads brads abrds bards drasb rdasb darsb adrsb radsb ardsb drsab rdsab dsrab sdrab rsdab srdab dasrb adsrb dsarb sdarb asdrb sadrb rasdb arsdb rsadb sradb asrdb sardb drbsa rdbsa dbrsa bdrsa rbdsa brdsa drsba rdsba dsrba sdrba rsdba srdba dbsra bdsra dsbra sdbra bsdra sbdra rbsda brsda rsbda srbda bsrda sbrda dabsr adbsr dbasr bdasr abdsr badsr dasbr adsbr dsabr sdabr asdbr sadbr dbsar bdsar dsbar sdbar bsdar sbdar absdr basdr asbdr sabdr bsadr sbadr rabsd arbsd rbasd brasd abrsd barsd rasbd arsbd rsabd srabd asrbd sarbd rbsad brsad rsbad srbad bsrad sbrad absrd basrd asbrd sabrd bsard sbard
Note: these 'words' (valid or invalid) are all the permutations of the word drabs. These words are obtained by scrambling the letters in drabs.