a-a a-b a-t aaa aab aam aan aat aau ab- aba abb abm abn abt abu ama amb amm amn amt amu an- ana anb anm ann ant anu at- ata atb atm atn att atu au- aua aub aum aun aut b-u baa bab bam ban bat bau bba bbb bbm bbn bbt bbu bma bmb bmm bmn bmt bmu bna bnb bnn bnt bnu bta btb btm btn btt btu bua bub bum bun but buu maa mab mam man mat mau mba mbb mbm mbt mbu mma mmb mmm mmn mmt mmu mna mnb mnm mnn mnt mnu mta mtb mtm mtn mtt mtu mua mub mum mun mut muu naa nab nam nan nat nau nba nbb nbm nbn nbt nbu nma nmb nmm nmn nmt nmu nna nnb nnm nnn nnt nnu nta ntb ntm ntn ntt ntu nua nub num nun nut nuu taa tab tam tan tat tau tba tbb tbm tbn tbt tbu tma tmb tmm tmn tmt tmu tna tnb tnm tnn tnt tta ttb ttm ttn ttt ttu tua tub tum tun tut tuu ua- uaa uab uam uan uat uau uba ubb ubn ubt ubu um- uma umb umm umn umt umu un- una unb unm unn unt unu uta utb utm utn utt utu uua uum uun uut uuu