cccc cccv ccee ccoc ccrc ccre ccrt cctc cctt cctv ccvo cec- cece ceco cect ceec ceke ceor cer- cerc cere cero cert cet- cete ceto cetv cevo ckck ckco ckcv cker ckoc ckoo ckor ckot ckrc ckvo coce cock coco coct cok- coke coko cook coot cor- corc core cork coro corr cort cotc cote coto cott cove covo crcc crce crcr cre- crec cree creo cret crkc croc croe crok croo cror crot crrt crtc crtv ctec ctor ctot ctrc ctvo ctvt cvcc cver cvet cvrr cvte eccc ecce ecco ecct ecko eco- ecot ecrc ecrr ecrv ect- ectc ecto ectv eeee eeke eeoc eerc eero eetc eete ekco ekek eker eket eore eotc eoto ercc erce erec erer eret erev erke eroc eroe eroo errc erre erro erve etcc etco etec etee eter etoe etok etre etro ette etto etvo ever evet evoe evoo evre evvk kccc kcck kccr kcct kccv kcec kcee kceo kcet kckc kckk kcko kckr kckv kcoe kcor kcot kcrc kcro kcrr kcrt kcrv kctc kcte kcto kctv kcvk kcvo kcvr kcvv keck keco kecr keek keer keet kekc keke keko keok ker- kerc kere kerk kero kerr kert kerv ket- ketc kete ketk keto ketr kett ketv keve kevt kkck kkco kkcr kkct kkkk kkoo kkor kkot kkov kkrc kkre kkrk kkro kkrr kkrt kkrv kktc kktk kktv kkvr kkvt kkvv kock koct kokc koke kokk koko kokr kooc kook kooo koor koot koov korc kore kork koro korr kort korv kotc kote kotk koto kotr kott kotv kovc kove kovk kovo kovr krcc krce krco krec kree krek kreo kret krev krkc krke krkk krko krkr krkv kroc kroe krok kroo kror krov krrc krre krrk krro krrr krrt krtc krtk krto krtr krtv krvc krve krvk krvo krvr krvv ktcc ktce ktck ktco ktcr ktcv ktec ktee ktek ktkc ktke ktkk ktko ktkr ktkt ktoc ktoe ktok ktoo ktor ktot ktrc ktre ktrk ktro ktrr ktrt ktrv kttc kttk ktto kttr kttt kttv ktvc ktve ktvk ktvo ktvr ktvt kvcc kvce kvck kvco kvcr kvct kvcv kvec kver kvet kvoc kvoe kvok kvoo kvor kvot kvov kvrc kvre kvro kvrr kvrv kvtk kvto kvtr kvtt kvtv kvvr kvvv o-eo occc occt oce ocee ocet ocke ocre ocro ocrr oct- octe octo oec- oecc oeec oere oker oket okko okok okor okot okre okro okto oocr ooer oooo oore oort orce orco ore- orec orek oreo orer orke orko oro- oroe orok oror orot orro ortc orte orto orve orvr otee oter oto- otoe otok otoo otor otov otre otro otte otto ovee over ovet ovo- ovoo ovot ovre rccc rcet rctc rctv rcvr recc rece reck recr rect reek reet reev reke reko rekt reot rere rero rert rete reto retr rett reve revo rocc roce rock roco roer roet roev roke rokk roko rokr rook roor root rorc rore rork roro rort rotc rote rotk roto rotr rott rove rovo rrrr rtcc rtce rtee rtve rv-c rver tccc tcov tctc teck teco tecr tect teec teek teer teet teev teke teok teor ter- terc tere terk tero terr tete teto tetr tett toce tock toco toee toek toer toet toke toko took toor toot torc tore tork toro torr tort torv totc tote toto totr tott tove tovo trcc tre- trec tree trek treo tret trev troc troe troo trot trtc trte trtr tteo tter ttoe tttt tver tvro tvrr tvtv vecc veck veer veet veke veor ver- vere verk vero vert vete veto vetr veve vevo vkor voce voer voet voke vooc voor voot vor- vore voro vort vote voto vovk vreo vret vroc vrot vrto vtec vver vvvv