xerus exrus xreus rxeus erxus rexus xeurs exurs xuers uxers euxrs uexrs xrues rxues xures uxres ruxes urxes eruxs reuxs eurxs uerxs ruexs urexs xersu exrsu xresu rxesu erxsu rexsu xesru exsru xseru sxeru esxru sexru xrseu rxseu xsreu sxreu rsxeu srxeu ersxu resxu esrxu serxu rsexu srexu xeusr exusr xuesr uxesr euxsr uexsr xesur exsur xseur sxeur esxur sexur xuser uxser xsuer sxuer usxer suxer eusxr uesxr esuxr seuxr usexr suexr xruse rxuse xurse uxrse ruxse urxse xrsue rxsue xsrue sxrue rsxue srxue xusre uxsre xsure sxure usxre suxre rusxe ursxe rsuxe sruxe usrxe surxe erusx reusx eursx uersx ruesx uresx ersux resux esrux serux rseux sreux eusrx uesrx esurx seurx userx suerx rusex ursex rsuex sruex usrex surex
Note: these 'words' (valid or invalid) are all the permutations of the word xerus. These words are obtained by scrambling the letters in xerus.