frena rfena ferna efrna refna erfna frnea rfnea fnrea nfrea rnfea nrfea fenra efnra fnera nfera enfra nefra renfa ernfa rnefa nrefa enrfa nerfa frean rfean feran efran refan erfan fraen rfaen faren afren rafen arfen fearn efarn faern afern eafrn aefrn reafn erafn raefn arefn earfn aerfn frnae rfnae fnrae nfrae rnfae nrfae frane rfane farne afrne rafne arfne fnare nfare fanre afnre nafre anfre rnafe nrafe ranfe arnfe narfe anrfe fenar efnar fnear nfear enfar nefar feanr efanr faenr afenr eafnr aefnr fnaer nfaer faner afner nafer anfer enafr neafr eanfr aenfr naefr anefr renaf ernaf rneaf nreaf enraf neraf reanf eranf raenf arenf earnf aernf rnaef nraef ranef arnef naref anref enarf nearf eanrf aenrf naerf anerf
Note: these 'words' (valid or invalid) are all the permutations of the word frena. These words are obtained by scrambling the letters in frena.