prot prri prti prtp prtr pter ptol ptop ptrf reef reel reep reet refe reff refg refi refl refr reft rege regi regl rego regr regt reif reii reil reir reit rele rell relo relp relt reof reog reol reop reot repe repi repl repo repp repr rept rere rerg reri rero rert rete reti reto retr rett rfef rffl rgit rgtr rief riel riep rier riet rife riff rift rige rigg rigi rigo riif rile rill rilo rilp riol riot ripe ripi ripl ripp ripr ript rire riri rite riti ritl rito ritt rlee rlef rlif roeg roel roer roet rofe roff rofl rofo roge rogg rogi rogo roif roig roil roio roir roit role rolf roll rolo rolp rolt roof roog rooi rool roop roor root rope ropo rore rori roro rort rote rotg roti rotl roto rotr rott rpet rpii rpoe rpof rrif rrle rrrr rtee rtei rtle rtlt rttp teef teel teer teet teff tefi tefl teft tegg tegi tego tegt teie teil teip teir tel- tele telg teli tell telo telt teor tepe tepi tepp ter- tere terf teri tero terp terr tete teti teto tetr tett tfot tfpt tftp tgel tgif tgle tie- tiee tief tiei tiel tieo tiep tier tiet tiff tifo tift tige tigi tigr tiit tile till tilo tilr tilt tiop tip- tipe tipi tipo tipp tipt tire tiri tirl tiro tirr tite titi tito titp titt tlli toee toei toer toet toff tofi tofo toft toge togo togr togt toie toil toit tol- tole toli toll tolo tolt toof tool toor toot top- tope topf topi topo topp topt tore torf torg tori toro torp torr tort tote toti toto totr tott tpeg tper tpir tpol tppp tppr tpte tptp tptr tre- tree tref treg trei treo tret trfr trge tri- trie trif trig tril trio trip trit troe trog troi troo trop trot trpe trpg trpp trte trtr tteo tter ttff ttoe ttop tttt