b-r-k bbook bhook bhour bo-bo bo-ho bobko bobok bobr bohok bohor bokko bokok bokor booko booru borbo borko borku boro- borok boroo borou borro bouko brobo brook brouk brrrr bukk- bukor buoho buroo burro burru buruk hhhhh hhour ho-ho ho-oh hobor hobro hobub hokku horro horru hubur huhuh hukok huork hurko hurok huuru k-rob khoku khoro khour khuru khuur ko-ko kobru kobuk kokko kokor kokou kokur kooru korbo korku koror korro koruk kubok kukko kukok kukur kurbu kurku kuruk o-r-b obhor oboro obrok oh-oh oh-ok ohour ohrob okkur okobo okoho okoro okubo okuku okuru ooooh ooooo orobo oruku oruro ouoro ro-ro robbo robo- robor robur rohob rohru rokkk rookh rorbu rouko rubor ruhub ubobo uh-oh uh-uh uhhoh uhhuh uhuru ukobu uroob urour urubu uuork uuuuu