aerif earif areif raeif eraif reaif aeirf eairf aierf iaerf eiarf iearf arief raief airef iaref riaef iraef eriaf reiaf eiraf ieraf rieaf ireaf aerfi earfi arefi raefi erafi reafi aefri eafri aferi faeri efari feari arfei rafei afrei farei rfaei fraei erfai refai efrai ferai rfeai freai aeifr eaifr aiefr iaefr eiafr ieafr aefir eafir afeir faeir efair feair aifer iafer afier faier ifaer fiaer eifar iefar efiar feiar ifear fiear arife raife airfe iarfe riafe irafe arfie rafie afrie farie rfaie fraie aifre iafre afire faire ifare fiare rifae irfae rfiae friae ifrae firae erifa reifa eirfa ierfa riefa irefa erfia refia efria feria rfeia freia eifra iefra efira feira ifera fiera rifea irfea rfiea friea ifrea firea
Note: these 'words' (valid or invalid) are all the permutations of the word aerif. These words are obtained by scrambling the letters in aerif.