regos ergos rgeos greos egros geros reogs erogs roegs oregs eorgs oergs rgoes groes roges orges gores ogres egors geors eogrs oegrs goers ogers regso ergso rgeso greso egrso gerso resgo ersgo rsego srego esrgo sergo rgseo grseo rsgeo srgeo gsreo sgreo egsro gesro esgro segro gsero sgero reosg erosg roesg oresg eorsg oersg resog ersog rseog sreog esrog serog roseg orseg rsoeg sroeg osreg soreg eosrg oesrg esorg seorg oserg soerg rgose grose rogse orgse gorse ogrse rgsoe grsoe rsgoe srgoe gsroe sgroe rosge orsge rsoge sroge osrge sorge gosre ogsre gsore sgore osgre sogre egosr geosr eogsr oegsr goesr ogesr egsor gesor esgor segor gseor sgeor eosgr oesgr esogr seogr osegr soegr goser ogser gsoer sgoer osger soger
Note: these 'words' (valid or invalid) are all the permutations of the word regos. These words are obtained by scrambling the letters in regos.