refit erfit rfeit freit efrit ferit reift erift rieft ireft eirft ierft rfiet friet rifet irfet firet ifret efirt feirt eifrt iefrt fiert ifert refti erfti rfeti freti efrti ferti retfi ertfi rtefi trefi etrfi terfi rftei frtei rtfei trfei ftrei tfrei eftri fetri etfri tefri fteri tferi reitf eritf rietf iretf eirtf iertf retif ertif rteif treif etrif terif ritef irtef rtief trief itref tiref eitrf ietrf etirf teirf iterf tierf rfite frite rifte irfte firte ifrte rftie frtie rtfie trfie ftrie tfrie ritfe irtfe rtife trife itrfe tirfe fitre iftre ftire tfire itfre tifre efitr feitr eiftr ieftr fietr ifetr eftir fetir etfir tefir fteir tfeir eitfr ietfr etifr teifr itefr tiefr fiter ifter ftier tfier itfer tifer
Note: these 'words' (valid or invalid) are all the permutations of the word refit. These words are obtained by scrambling the letters in refit.