flued lfued fuled ufled lufed ulfed fleud lfeud felud eflud lefud elfud fueld ufeld feuld efuld uefld eufld luefd ulefd leufd elufd uelfd eulfd flude lfude fulde uflde lufde ulfde fldue lfdue fdlue dflue ldfue dlfue fudle ufdle fdule dfule udfle dufle ludfe uldfe ldufe dlufe udlfe dulfe fledu lfedu feldu efldu lefdu elfdu fldeu lfdeu fdleu dfleu ldfeu dlfeu fedlu efdlu fdelu dfelu edflu deflu ledfu eldfu ldefu dlefu edlfu delfu fuedl ufedl feudl efudl uefdl eufdl fudel ufdel fduel dfuel udfel dufel fedul efdul fdeul dfeul edful deful uedfl eudfl udefl duefl edufl deufl luedf uledf leudf eludf ueldf euldf ludef uldef lduef dluef udlef dulef leduf elduf ldeuf dleuf edluf deluf uedlf eudlf udelf duelf edulf deulf
Note: these 'words' (valid or invalid) are all the permutations of the word flued. These words are obtained by scrambling the letters in flued.