fouer ofuer fuoer ufoer oufer uofer foeur ofeur feour efour oefur eofur fueor ufeor feuor efuor uefor eufor ouefr uoefr oeufr eoufr ueofr euofr foure ofure fuore ufore oufre uofre forue ofrue froue rfoue orfue rofue furoe ufroe fruoe rfuoe urfoe rufoe ourfe uorfe orufe roufe urofe ruofe foeru oferu feoru eforu oefru eofru foreu ofreu froeu rfoeu orfeu rofeu ferou efrou freou rfeou erfou refou oerfu eorfu orefu roefu erofu reofu fuero ufero feuro efuro uefro eufro fureo ufreo frueo rfueo urfeo rufeo feruo efruo freuo rfeuo erfuo refuo uerfo eurfo urefo ruefo erufo reufo ouerf uoerf oeurf eourf ueorf euorf ouref uoref oruef rouef uroef ruoef oeruf eoruf oreuf roeuf erouf reouf uerof eurof ureof rueof eruof reuof
Note: these 'words' (valid or invalid) are all the permutations of the word fouer. These words are obtained by scrambling the letters in fouer.