pref pren prep pret prfc prna prnp prtc prtp prtr ptaf ptca ptcc pten pter ptrf pttc raaf raan raat rac- raca racc race ract raec raef raen raep raer rafa rafc rafe raff raft rana ranc rane rann rant rapa rapc rape rapp rapt rara rare rarf rata rate ratf ratp ratt rcac rcaf rccc rcep rcet rcfc rcnr rcpt rctc rea- reac reae reaf rean reap rear reat reca recc rece recp recr rect reef reen reep reet refe reff refn refr reft rena rene renn rent repe repp repr rept rera rere rert reta rete retr rett rfae rfef rffc rftc rnaf rncp rnnt rntp rpca rpet rpfc rppn rpta rptn rrat rrfc rrna rrrr rtan rtca rtcc rtce rtee rtfc rtpa rttp taa- taaf taan taar taat taca tacc tace tact taec taen taer tafa tafc tafe taff taft tana tane tann tant tapa tape tapp tapr tapt tara tarc tare tarf tarn tarp tarr tart tata tate tatr tatt tcap tcca tccc tcep tcfc tcnn tcpa tctc teac tean tear teat teca tecr tect teec teef teen teer teet tefc teff teft tena tenc tene tenn tenp tent tepa tepe tepp ter- tera terc tere terf tern terp terr teta tete tetr tett tfae tfca tfec tfnp tfpt tftc tftp tnca tncc tnef tnfc tpac tpap tpcp tper tppa tppp tppr tpte tptp tptr traa trac trae traf tran trap trat trca trcc tre- trea trec tree tref tren tret trfc trfr trna trpa trpc trpe trpn trpp trra trtc trte trtr ttcn ttcp tten tter ttfa ttfc ttff ttfn tttt