b-r-k bbook bkorn bo-bo bobko bobok bobr bokko bokok bokor bokun bonon bonou booko boonk boorn booru borbo borko borku born- borno bornu boro- borok boron boroo borou borro borun bouko bourn brobo bronk bronn brook broon brouk broun brrrr brunk brunn bruno bruun bubon bukk- buknu bukor bunko bunuk bunun buono burn- buron buroo burro burru buruk burun k-rob knokk knork knorr knurr ko-ko kobru kobuk kobun kokko kokor kokou kokur konbu konno konnu konro konur koonu koorn kooru korbo korku korno koron koror korro koruk korun kouno krnuo kronk kroon kroun krunk kruun kubok kukko kukok kukur kunku kunur kurbu kurku kuruk nkubu nnooo no-no nobob nobuo nokko nokon non-u nonno noonu norbu norok noron norro norun nu-nu nunon nunun nuoro nuruk nurun o-bon o-r-b oboro obrok okkur okobo okoro okubo okuku okuru onoon onorn onour ooooo ornon orobo orono oruku oruro ouoro ourno ro-ro robbo robo- robon robor robun robur rokkk rokon ronk- ronko ronno ronok rorbu rouko rubon rubor runo- runon ubobo ukobu unkur unnun unnur unoor unorn unrun unurn urkun urnok uroob urour urubu uuork uuuuu