a-a a-b a-c a-t aaa aab aac aam aar aat aau ab- aba abb abc abm abr abt abu ac- aca acb acc acm acr act acu ama amb amc amm amr amt amu ar- ara arb arc arm arr art aru at- ata atb atc atm atr att atu au- aua aub auc aum aur aut b-u baa bab bac bam bar bat bau bba bbb bbc bbm bbr bbt bbu bca bcb bcc bcm bcr bct bcu bma bmb bmc bmm bmr bmt bmu bra brb brm brr brt bru bta btb btc btm btr btt btu bua bub buc bum bur but buu c-- caa cab cac cam car cat cau cba cbb cbc cbm cbr cbt cbu cca ccb ccc ccm ccr cct ccu cma cmb cmc cmm cmr cmt cmu cra crb crc crm crr crt cru cta ctb ctc ctm ctr ctt ctu cua cub cuc cum cur cut cuu m-r maa mab mac mam mar mat mau mba mbb mbc mbm mbr mbt mbu mc- mca mcb mcc mcm mcr mct mcu mma mmb mmc mmm mmr mmt mmu mra mrb mrc mrm mrr mrt mru mta mtb mtc mtm mtr mtt mtu mua mub muc mum mur mut muu ra- raa rab rac ram rar rat rau rba rbb rbc rbm rbr rbt rbu rca rcb rcc rcm rcr rct rcu rma rmb rmc rmm rmr rmt rra rrb rrc rrm rrr rrt rru rta rtb rtc rtm rtr rtt rtu rua rub ruc rum rur rut ruu taa tab tac tam tar tat tau tba tbb tbc tbm tbr tbt tbu tca tcb tcc tcm tcr tct tcu tma tmb tmc tmm tmr tmt tmu tra trb trc trm trr trt tru tta ttb ttc ttm ttr ttt ttu tua tub tuc tum tur tut tuu ua- uaa uab uac uam uar uat uau uba ubb ubc ubr ubt ubu uca ucb ucc ucm ucr uct ucu um- uma umb umc umm umr umt umu ur- ura urb urc urm urr urt uru uta utb utc utm utr utt utu uua uuc uum uur uut uuu