oto- otoh otok otoo otor otra otro otta otto raab raak raat raba rabb rabk rabo rac- raca racc rach rack raco ract raha rahr raht raka rakk rakt raob raoc raoh raok rara rarb rark raro rata rath ratk rato ratt rbbb rbbr rboh rcac rcbc rcbo rccb rccc rchb rctc rhoa rhob rhoc rhoh roab roak roar roat rob- roba robb robo robt roca rocc roch rock roco roha rohr roka rokh rokk roko rokr roob rook roor root rora rorc rork roro rort rota rotc roth rotk roto rotr rott rrah rrat rrrr rtca rtcc rthk taa- taar taat taba tabb tabc tabo taca tacc tach tack taco tact taha taho tahr taka takk tako takt taoa taor tara tarb tarc tark taro tarr tart tata tatb tath tato tatr tatt tbar tbca tbcb tbcc tbrb tbta tcca tccc tch- tcha tchh tcho tchr tctc thaa thak thao thar that thca thch thoo thor thot thra thro thtb thtr tkac toab toat toba tobo tobt toca toch tock toco toho toka toko tooa tooh took toor toot tora torc tork toro torr tort tota totc toth toto totr tott traa trab trac trak trao trat trca trcc troa troc troo trot trra trtc trtr ttab ttbb tttt