ecrus cerus ercus recus creus rceus ecurs ceurs eucrs uecrs cuers ucers erucs reucs eurcs uercs ruecs urecs crues rcues cures ucres ruces urces ecrsu cersu ercsu recsu cresu rcesu ecsru cesru escru secru cseru sceru erscu rescu esrcu sercu rsecu srecu crseu rcseu csreu screu rsceu srceu ecusr ceusr eucsr uecsr cuesr ucesr ecsur cesur escur secur cseur sceur euscr uescr esucr seucr usecr suecr cuser ucser csuer scuer uscer sucer erusc reusc eursc uersc ruesc uresc ersuc resuc esruc seruc rseuc sreuc eusrc uesrc esurc seurc userc suerc rusec ursec rsuec sruec usrec surec cruse rcuse curse ucrse rucse urcse crsue rcsue csrue scrue rscue srcue cusre ucsre csure scure uscre sucre rusce ursce rsuce sruce usrce surce
Note: these 'words' (valid or invalid) are all the permutations of the word ecrus. These words are obtained by scrambling the letters in ecrus.