occa occc occt oclc ocra ocrl ocro ocrr oct- octa octo okak okka okko okla oklo okok okol okor okot okra okro okta okto olac olar olat olba olbo olca olcc olka olla ollo olor olot olta ooaa ooak ooba oocr oola oolo oooo oora oort ootb orab orac orak oral orao orar orat orba orbb orbo orca orco orka orko orla orlo oro- orok oror orot orra orro orta ortc orto otac otak otar otcl oto- otok otoo otor otra otro otta otto raab raak raat raba rabb rabk rabl rabo rac- raca racc rack raco ract raka rakk rakt rala ralb rall ralo ralt raob raoc raok raol rara rarb rark raro rata ratk rato ratt rbbb rbbr rbcl rcac rcbc rcbo rccb rccc rctc rlab roab roak roar roat rob- roba robb robo robt roca rocc rock roco roka rokk roko rokr rola rolk roll rolo rolt roob rook rool roor root rora rorc rork roro rort rota rotc rotk rotl roto rotr rott rrat rrrr rtca rtcc rtlt taa- taal taar taat taba tabb tabc tabl tabo taca tacc tack tacl taco tact taka takk tako takt tala talc talk tall talo taoa taor tara tarb tarc tark taro tarr tart tata tatb tato tatr tatt tbar tbca tbcb tbcc tbrb tbta tcca tccc tctc tkac tkol tlac tlco toab toal toat toba tobo tobt toca tock toco toka toko tol- tola tolk toll tolo tolt tooa took tool toor toot tora torc tork toro torr tort tota totc toto totr tott traa trab trac trak tral trao trat trca trcc trcl troa troc troo trot trra trtc trtr ttab ttbb tttt