lifer ilfer lfier flier ifler filer liefr ilefr leifr elifr ielfr eilfr lfeir fleir lefir elfir felir eflir ifelr fielr ieflr eiflr feilr efilr lifre ilfre lfire flire iflre filre lirfe ilrfe lrife rlife irlfe rilfe lfrie flrie lrfie rlfie frlie rflie ifrle firle irfle rifle frile rfile lierf ilerf leirf elirf ielrf eilrf liref ilref lrief rlief irlef rilef lerif elrif lreif rleif erlif relif ierlf eirlf irelf rielf erilf reilf lferi fleri lefri elfri felri eflri lfrei flrei lrfei rlfei frlei rflei lerfi elrfi lrefi rlefi erlfi relfi ferli efrli freli rfeli erfli refli iferl fierl iefrl eifrl feirl efirl ifrel firel irfel rifel friel rfiel ierfl eirfl irefl riefl erifl reifl feril efril freil rfeil erfil refil
Note: these 'words' (valid or invalid) are all the permutations of the word lifer. These words are obtained by scrambling the letters in lifer.