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