rexis erxis rxeis xreis exris xeris reixs erixs riexs irexs eirxs ierxs rxies xries rixes irxes xires ixres exirs xeirs eixrs iexrs xiers ixers rexsi erxsi rxesi xresi exrsi xersi resxi ersxi rsexi srexi esrxi serxi rxsei xrsei rsxei srxei xsrei sxrei exsri xesri esxri sexri xseri sxeri reisx erisx riesx iresx eirsx iersx resix ersix rseix sreix esrix serix risex irsex rsiex sriex isrex sirex eisrx iesrx esirx seirx iserx sierx rxise xrise rixse irxse xirse ixrse rxsie xrsie rsxie srxie xsrie sxrie risxe irsxe rsixe srixe isrxe sirxe xisre ixsre xsire sxire isxre sixre exisr xeisr eixsr iexsr xiesr ixesr exsir xesir esxir sexir xseir sxeir eisxr iesxr esixr seixr isexr siexr xiser ixser xsier sxier isxer sixer
Note: these 'words' (valid or invalid) are all the permutations of the word rexis. These words are obtained by scrambling the letters in rexis.