nudib undib nduib dnuib udnib dunib nuidb unidb niudb inudb uindb iundb ndiub dniub nidub indub dinub idnub udinb duinb uidnb iudnb diunb idunb nudbi undbi ndubi dnubi udnbi dunbi nubdi unbdi nbudi bnudi ubndi bundi ndbui dnbui nbdui bndui dbnui bdnui udbni dubni ubdni budni dbuni bduni nuibd unibd niubd inubd uinbd iunbd nubid unbid nbuid bnuid ubnid bunid nibud inbud nbiud bniud ibnud binud uibnd iubnd ubind buind ibund biund ndibu dnibu nidbu indbu dinbu idnbu ndbiu dnbiu nbdiu bndiu dbniu bdniu nibdu inbdu nbidu bnidu ibndu bindu dibnu idbnu dbinu bdinu ibdnu bidnu udibn duibn uidbn iudbn diubn idubn udbin dubin ubdin budin dbuin bduin uibdn iubdn ubidn buidn ibudn biudn dibun idbun dbiun bdiun ibdun bidun
Note: these 'words' (valid or invalid) are all the permutations of the word nudib. These words are obtained by scrambling the letters in nudib.