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