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