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