edtub detub etdub tedub dteub tdeub edutb deutb eudtb uedtb duetb udetb etudb teudb eutdb uetdb tuedb utedb dtueb tdueb duteb udteb tudeb utdeb edtbu detbu etdbu tedbu dtebu tdebu edbtu debtu ebdtu bedtu dbetu bdetu etbdu tebdu ebtdu betdu tbedu btedu dtbeu tdbeu dbteu bdteu tbdeu btdeu edubt deubt eudbt uedbt duebt udebt edbut debut ebdut bedut dbeut bdeut eubdt uebdt ebudt beudt ubedt buedt dubet udbet dbuet bduet ubdet budet etubd teubd eutbd uetbd tuebd utebd etbud tebud ebtud betud tbeud bteud eubtd uebtd ebutd beutd ubetd buetd tubed utbed tbued btued ubted buted dtube tdube dutbe udtbe tudbe utdbe dtbue tdbue dbtue bdtue tbdue btdue dubte udbte dbute bdute ubdte budte tubde utbde tbude btude ubtde butde
Note: these 'words' (valid or invalid) are all the permutations of the word edtub. These words are obtained by scrambling the letters in edtub.