rband brand rabnd arbnd barnd abrnd rbnad brnad rnbad nrbad bnrad nbrad ranbd arnbd rnabd nrabd anrbd narbd banrd abnrd bnard nbard anbrd nabrd rbadn bradn rabdn arbdn bardn abrdn rbdan brdan rdban drban bdran dbran radbn ardbn rdabn drabn adrbn darbn badrn abdrn bdarn dbarn adbrn dabrn rbnda brnda rnbda nrbda bnrda nbrda rbdna brdna rdbna drbna bdrna dbrna rndba nrdba rdnba drnba ndrba dnrba bndra nbdra bdnra dbnra ndbra dnbra randb arndb rnadb nradb anrdb nardb radnb ardnb rdanb dranb adrnb darnb rndab nrdab rdnab drnab ndrab dnrab andrb nadrb adnrb danrb ndarb dnarb bandr abndr bnadr nbadr anbdr nabdr badnr abdnr bdanr dbanr adbnr dabnr bndar nbdar bdnar dbnar ndbar dnbar andbr nadbr adnbr danbr ndabr dnabr
Note: these 'words' (valid or invalid) are all the permutations of the word rband. These words are obtained by scrambling the letters in rband.