felid eflid fleid lfeid elfid lefid feild efild field ifeld eifld iefld flied lfied filed ifled lifed ilfed elifd leifd eilfd ielfd liefd ilefd feldi efldi fledi lfedi elfdi lefdi fedli efdli fdeli dfeli edfli defli fldei lfdei fdlei dflei ldfei dlfei eldfi ledfi edlfi delfi ldefi dlefi feidl efidl fiedl ifedl eifdl iefdl fedil efdil fdeil dfeil edfil defil fidel ifdel fdiel dfiel idfel difel eidfl iedfl edifl deifl idefl diefl flide lfide filde iflde lifde ilfde fldie lfdie fdlie dflie ldfie dlfie fidle ifdle fdile dfile idfle difle lidfe ildfe ldife dlife idlfe dilfe elidf leidf eildf ieldf liedf iledf eldif ledif edlif delif ldeif dleif eidlf iedlf edilf deilf idelf dielf lidef ildef ldief dlief idlef dilef
Note: these 'words' (valid or invalid) are all the permutations of the word felid. These words are obtained by scrambling the letters in felid.