bbook bo-bo bobko bobok bokko bokok bokun bonon bonou bonut booko boonk boont botok boton botou bottu botun bouko bouto bubon bukk- buknu bunko bunuk bunun bunut buono butko butno buto- buton butot butou butuo butut k-t-b knokk knott knout ko-ko kobuk kobun kokko kokot kokou kokut konbu konno konnu koonu koton kotto kottu kouno kouto kubok kukko kukok kunku kutno kutob kuttu nkotb nkubu nnooo no-no nobob nobuo nobut nokko nokon non-u nonno nonot noonu notno noto- notok noton notto nu-nu nunon nunun nuton nutuk o-bon obout okbut okobo okubo okuku onont onoon onoto onout onto- ontoo ooooo otoku otono ototo oubut outon outto t-nut tbtbt tbutt tntnt tobon tobot tobou tokko toko- tokuo tonbu tono- tonto toto- totok toton totoo ttttt tubo- tubon tubou tunku tunon tuotu tutku tutto tutun ubobo ukobu unnun unnut ututo uuuuu