lifts ilfts lfits flits iflts filts litfs iltfs ltifs tlifs itlfs tilfs lftis fltis ltfis tlfis ftlis tflis iftls fitls itfls tifls ftils tfils lifst ilfst lfist flist iflst filst lisft ilsft lsift slift islft silft lfsit flsit lsfit slfit fslit sflit ifslt fislt isflt siflt fsilt sfilt litsf iltsf ltisf tlisf itlsf tilsf listf ilstf lsitf slitf isltf siltf ltsif tlsif lstif sltif tslif stlif itslf tislf istlf sitlf tsilf stilf lftsi fltsi ltfsi tlfsi ftlsi tflsi lfsti flsti lsfti slfti fslti sflti ltsfi tlsfi lstfi sltfi tslfi stlfi ftsli tfsli fstli sftli tsfli stfli iftsl fitsl itfsl tifsl ftisl tfisl ifstl fistl isftl siftl fsitl sfitl itsfl tisfl istfl sitfl tsifl stifl ftsil tfsil fstil sftil tsfil stfil
Note: these 'words' (valid or invalid) are all the permutations of the word lifts. These words are obtained by scrambling the letters in lifts.