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