prat prbc prca prcc prcp pre- preb prec pree prep pret pro- proa prob proc proe proo prop prot prtc prtp prtr ptab ptca ptcc pter ptop pttc raab raat raba rabb rabe rabo rac- raca racc race raco ract raec raep raer raob raoc raop rapa rapc rape rapp rapt rara rarb rare raro rata rate rato ratp ratt rbbb rbbr rcac rcbc rcbo rccb rccc rcep rcet rcpo rcpt rctc rea- reac reae reao reap rear reat reba rebb rebe rebo reca recc rece recp recr rect reeb reep reet reop reot repe repo repp repr rept rera rere rero rert reta rete reto retr rett roab roap roar roat rob- roba robb robe robo robt roca rocc roce roco roea roer roet roob roop roor root ropa rope ropo rora rorc rore roro rort rota rotc rote roto rotr rott rpca rpet rpob rpoe rpta rrat rrrr rtca rtcc rtce rtee rtpa rttp taa- taar taat taba tabb tabc tabe tabo taca tacc tace taco tact taec taer taoa taor tapa tape tapo tapp tapr tapt tara tarb tarc tare taro tarp tarr tart tata tatb tate tato tatr tatt tbar tbca tbcb tbcc tbce tbrb tbta tbtp tcap tcca tccc tcep tcpa tcpo tctc teac tear teat teba tebo teca teco tecr tect teec teer teet teor tepa tepe tepp ter- tera terc tere tero terp terr teta tete teto tetr tett toab toat toba tobe tobo tobt toca toce toco toea toee toer toet tooa toor toot top- topa tope topo topp topt tora torc tore toro torp torr tort tota totc tote toto totr tott tpac tpap tpcp tper tppa tppp tppr tpte tptp tptr traa trab trac trae trao trap trat trca trcc tre- trea trec tree treo tret troa troc troe troo trop trot trpa trpc trpe trpp trra trtc trte trtr ttab ttbb ttcp tteo tter ttoe ttop tttt