oreo orer orfe orff orna ornc orne orno oro- oroe orof oron oror orot orra orro orta ortc orte orto otac otan otar otea otee oten oter otfc oto- otoe otof oton otoo otor otra otre otro otta otte otto raaf raan raat rac- raca racc race raco ract raec raef raen raer rafa rafc rafe raff raft rana ranc rane rann rano rant raoc rara rare rarf raro rata rate ratf rato ratt rcac rcaf rccc rcet rcfc rcnr rcon rctc rea- reac reae reaf rean reao rear reat reca recc rece recr rect reef reen reet refe reff refn refr reft rena rene renn reno rent reof reot rera rere rero rert reta rete reto retr rett rfae rfef rffc rftc rnaf rnco rnnt rnot roaf roan roar roat roca rocc roce roco roea roen roer roet rofc rofe roff rofo rona ronc rone rono ront roof roon roor root rora rorc rore roro rort rota rotc rote rotn roto rotr rott rrat rrfc rrna rrrr rtan rtca rtcc rtce rtee rtfc taa- taaf taan taar taat taca tacc tace taco tact taec taen taer tafa tafc tafe taff tafo taft tana tane tann tano tant taoa taor tara tarc tare tarf tarn taro tarr tart tata tate tato tatr tatt tcca tccc tcfc tcnn tcon tctc teac tean tear teat teca teco tecr tect teec teef teen teer teet tefc teff teft tena tenc tene tenn teno tent teon teor ter- tera terc tere terf tern tero terr teta tete teto tetr tett tfae tfca tfec tfot tftc tnca tncc tnef tnfc toan toat toca toce toco toea toee toen toer toet tofa toff tofo toft tona tone tonn tono tooa toof toon toor toot tora torc tore torf torn toro torr tort tota totc tote toto totr tott traa trac trae traf tran trao trat trca trcc tre- trea trec tree tref tren treo tret trfc trfr trna trno troa troc troe tron troo trot trra trtc trte trtr ttcn tten tteo tter ttfa ttfc ttff ttfn ttoe tton tttt