fetli eftli fteli tfeli etfli tefli felti eflti fleti lfeti elfti lefti ftlei tflei fltei lftei tlfei ltfei etlfi telfi eltfi letfi tlefi ltefi fetil eftil fteil tfeil etfil tefil feitl efitl fietl ifetl eiftl ieftl ftiel tfiel fitel iftel tifel itfel etifl teifl eitfl ietfl tiefl itefl felit eflit fleit lfeit elfit lefit feilt efilt fielt ifelt eiflt ieflt fliet lfiet filet iflet lifet ilfet elift leift eilft ielft lieft ileft ftlie tflie fltie lftie tlfie ltfie ftile tfile fitle iftle tifle itfle flite lfite filte iflte lifte ilfte tlife ltife tilfe itlfe litfe iltfe etlif telif eltif letif tleif lteif etilf teilf eitlf ietlf tielf itelf elitf leitf eiltf ieltf lietf iletf tlief ltief tilef itlef litef iltef
Note: these 'words' (valid or invalid) are all the permutations of the word fetli. These words are obtained by scrambling the letters in fetli.