a-a a-b aaa aab aam aan aau ab- aba abb abm abn abu ama amb amm amn amu an- ana anb anm ann anu au- aua aub aum aun b-u baa bab bam ban bau bba bbb bbm bbn bbu bma bmb bmm bmn bmu bna bnb bnn bnu bua bub bum bun buu maa mab mam man mau mba mbb mbm mbu mma mmb mmm mmn mmu mna mnb mnm mnn mnu mua mub mum mun muu naa nab nam nan nau nba nbb nbm nbn nbu nma nmb nmm nmn nmu nna nnb nnm nnn nnu nua nub num nun nuu ua- uaa uab uam uan uau uba ubb ubn ubu um- uma umb umm umn umu un- una unb unm unn unu uua uum uun uuu