erigs reigs eirgs iergs riegs iregs ergis regis egris geris rgeis greis eigrs iegrs egirs geirs igers giers riges irges rgies gries igres gires erisg reisg eirsg iersg riesg iresg ersig resig esrig serig rseig sreig eisrg iesrg esirg seirg iserg sierg riseg irseg rsieg srieg isreg sireg ergsi regsi egrsi gersi rgesi gresi ersgi resgi esrgi sergi rsegi sregi egsri gesri esgri segri gseri sgeri rgsei grsei rsgei srgei gsrei sgrei eigsr iegsr egisr geisr igesr giesr eisgr iesgr esigr seigr isegr siegr egsir gesir esgir segir gseir sgeir igser giser isger siger gsier sgier rigse irgse rgise grise igrse girse risge irsge rsige srige isrge sirge rgsie grsie rsgie srgie gsrie sgrie igsre gisre isgre sigre gsire sgire
Note: these 'words' (valid or invalid) are all the permutations of the word erigs. These words are obtained by scrambling the letters in erigs.