hnrnpr hohhot hohoho honnor honor- honton hoohoo hoopoo hooroo hooton hopnpp hopton hororo horror horton hortor hotnot hotoro hotpot hotton hottot n-toon non-no non-op nonhot nonono nonoon nonpro noonoo noonor noonto norton notho- nothot notron notton nottoo ohnono ohohoh ohpooh ohtoto oohooh oooooo oporto optoro oroton orphon orrho- ortho- ottoor phono- phonon phoro- photo- photon phthor ponton poopoo popopo poporo poppop poptop porno- porron porton potron potton pottop pppppp pronto proph- propho proto- proton ronnon ronron rooton rotton thonon thonor thornn thoro- thoron throop to-on tohoro tonono tonoro tonpon tonton toohot tootoo toppop topton tororo toroth torpor tortor totnor totopo totoro totrot tronoh tronto troph- tropo- troppo trotro