resid ersid rseid sreid esrid serid reisd erisd riesd iresd eirsd iersd rsied sried rised irsed sired isred esird seird eisrd iesrd sierd iserd resdi ersdi rsedi sredi esrdi serdi redsi erdsi rdesi dresi edrsi dersi rsdei srdei rdsei drsei sdrei dsrei esdri sedri edsri desri sderi dseri reids erids rieds ireds eirds ierds redis erdis rdeis dreis edris deris rides irdes rdies dries idres dires eidrs iedrs edirs deirs iders diers rside sride risde irsde sirde isrde rsdie srdie rdsie drsie sdrie dsrie ridse irdse rdise drise idrse dirse sidre isdre sdire dsire idsre disre esidr seidr eisdr iesdr siedr isedr esdir sedir edsir desir sdeir dseir eidsr iedsr edisr deisr idesr diesr sider isder sdier dsier idser diser
Note: these 'words' (valid or invalid) are all the permutations of the word resid. These words are obtained by scrambling the letters in resid.