sgurd gsurd sugrd usgrd gusrd ugsrd sgrud gsrud srgud rsgud grsud rgsud surgd usrgd srugd rsugd ursgd rusgd gursd ugrsd grusd rgusd urgsd rugsd sgudr gsudr sugdr usgdr gusdr ugsdr sgdur gsdur sdgur dsgur gdsur dgsur sudgr usdgr sdugr dsugr udsgr dusgr gudsr ugdsr gdusr dgusr udgsr dugsr sgrdu gsrdu srgdu rsgdu grsdu rgsdu sgdru gsdru sdgru dsgru gdsru dgsru srdgu rsdgu sdrgu dsrgu rdsgu drsgu grdsu rgdsu gdrsu dgrsu rdgsu drgsu surdg usrdg srudg rsudg ursdg rusdg sudrg usdrg sdurg dsurg udsrg dusrg srdug rsdug sdrug dsrug rdsug drsug urdsg rudsg udrsg dursg rdusg drusg gurds ugrds gruds rguds urgds rugds gudrs ugdrs gdurs dgurs udgrs dugrs grdus rgdus gdrus dgrus rdgus drgus urdgs rudgs udrgs durgs rdugs drugs
Note: these 'words' (valid or invalid) are all the permutations of the word sgurd. These words are obtained by scrambling the letters in sgurd.