delta edlta dleta ldeta eldta ledta detla edtla dtela tdela etdla tedla dltea ldtea dtlea tdlea ltdea tldea eltda letda etlda telda lteda tleda delat edlat dleat ldeat eldat ledat dealt edalt daelt adelt eadlt aedlt dlaet ldaet dalet adlet ladet aldet eladt leadt ealdt aeldt laedt aledt detal edtal dteal tdeal etdal tedal deatl edatl daetl adetl eadtl aedtl dtael tdael datel adtel tadel atdel etadl teadl eatdl aetdl taedl atedl dltae ldtae dtlae tdlae ltdae tldae dlate ldate dalte adlte ladte aldte dtale tdale datle adtle tadle atdle ltade tlade latde altde talde atlde eltad letad etlad telad ltead tlead elatd leatd ealtd aeltd laetd aletd etald teald eatld aetld taeld ateld ltaed tlaed lated alted taled atled
Note: these 'words' (valid or invalid) are all the permutations of the word delta. These words are obtained by scrambling the letters in delta.