a-a a-b a-t aaa aab aam aat aau ab- aba abb abm abt abu ama amb amm amt amu at- ata atb atm att atu au- aua aub aum aut b-u baa bab bam bat bau bba bbb bbm bbt bbu bma bmb bmm bmt bmu bta btb btm btt btu bua bub bum but buu maa mab mam mat mau mba mbb mbm mbt mbu mma mmb mmm mmt mmu mta mtb mtm mtt mtu mua mub mum mut muu taa tab tam tat tau tba tbb tbm tbt tbu tma tmb tmm tmt tmu tta ttb ttm ttt ttu tua tub tum tut tuu ua- uaa uab uam uat uau uba ubb ubt ubu um- uma umb umm umt umu uta utb utm utt utu uua uum uut uuu