bbook bo-bo bobko bobok bokko bokok bokun bombo bonon bonou bonum booko boomb boonk bouko bubon bukk- buknu bukom bumbo bumbu bunko bunuk bunun buono knokk ko-ko kobuk kobun kokko kokou kokum kombo kombu komku komon konbu konno konnu koonu kouno kubok kukko kukok kumbo kumon kumuk kunku mmmmm mokko mokon mokuk mokum mombo mombu monno mono- monok monon mookk mounk mumbo mummu mumok mumun nbomb nkomo nkubu nnooo no-no nobob nobuo nokko nokon nommo nomo- nomom non-u nonno noonu nu-nu nunon nunun o-bon okobo okubo okuku omoon omuku onmun onoon ooooo ubobo ukobu unnun uuuuu