luter ulter ltuer tluer utler tuler luetr uletr leutr elutr ueltr eultr lteur tleur letur eltur telur etlur utelr tuelr uetlr eutlr teulr etulr lutre ultre lture tlure utlre tulre lurte ulrte lrute rlute urlte rulte ltrue tlrue lrtue rltue trlue rtlue utrle turle urtle rutle trule rtule luert ulert leurt elurt uelrt eulrt luret ulret lruet rluet urlet rulet lerut elrut lreut rleut erlut relut uerlt eurlt urelt ruelt erult reult lteru tleru letru eltru telru etlru ltreu tlreu lrteu rlteu trleu rtleu lertu elrtu lretu rletu erltu reltu terlu etrlu trelu rtelu ertlu retlu uterl tuerl uetrl eutrl teurl eturl utrel turel urtel rutel truel rtuel uertl eurtl uretl ruetl erutl reutl terul etrul treul rteul ertul retul
Note: these 'words' (valid or invalid) are all the permutations of the word luter. These words are obtained by scrambling the letters in luter.