a-a a-b a-t aaa aab aam aar aat aau ab- aba abb abm abr abt abu ama amb amm amr amt amu ar- ara arb arm arr art aru at- ata atb atm atr att atu au- aua aub aum aur aut b-u baa bab bam bar bat bau bba bbb bbm bbr bbt bbu bma bmb bmm bmr bmt bmu bra brb brm brr brt bru bta btb btm btr btt btu bua bub bum bur but buu m-r maa mab mam mar mat mau mba mbb mbm mbr mbt mbu mma mmb mmm mmr mmt mmu mra mrb mrm mrr mrt mru mta mtb mtm mtr mtt mtu mua mub mum mur mut muu ra- raa rab ram rar rat rau rba rbb rbm rbr rbt rbu rma rmb rmm rmr rmt rra rrb rrm rrr rrt rru rta rtb rtm rtr rtt rtu rua rub rum rur rut ruu taa tab tam tar tat tau tba tbb tbm tbr tbt tbu tma tmb tmm tmr tmt tmu tra trb trm trr trt tru tta ttb ttm ttr ttt ttu tua tub tum tur tut tuu ua- uaa uab uam uar uat uau uba ubb ubr ubt ubu um- uma umb umm umr umt umu ur- ura urb urm urr urt uru uta utb utm utr utt utu uua uum uur uut uuu