a-a a-b a-t aaa aab aam aan aar aat aau ab- aba abb abm abn abr abt abu ama amb amm amn amr amt amu an- ana anb anm ann anr ant anu ar- ara arb arm arn arr art aru at- ata atb atm atn atr att atu au- aua aub aum aun aur aut b-u baa bab bam ban bar bat bau bba bbb bbm bbn bbr bbt bbu bma bmb bmm bmn bmr bmt bmu bna bnb bnn bnr bnt bnu bra brb brm brn brr brt bru bta btb btm btn btr btt btu bua bub bum bun bur but buu m-r maa mab mam man mar mat mau mba mbb mbm mbr mbt mbu mma mmb mmm mmn mmr mmt mmu mna mnb mnm mnn mnr mnt mnu mra mrb mrm mrn mrr mrt mru mta mtb mtm mtn mtr mtt mtu mua mub mum mun mur mut muu naa nab nam nan nar nat nau nba nbb nbm nbn nbr nbt nbu nma nmb nmm nmn nmr nmt nmu nna nnb nnm nnn nnt nnu nra nrb nrm nrn nrr nrt nru nta ntb ntm ntn ntr ntt ntu nua nub num nun nur nut nuu ra- raa rab ram ran rar rat rau rba rbb rbm rbn rbr rbt rbu rma rmb rmm rmn rmr rmt rna rnb rnm rnn rnr rnt rnu rra rrb rrm rrn rrr rrt rru rta rtb rtm rtn rtr rtt rtu rua rub rum run rur rut ruu taa tab tam tan tar tat tau tba tbb tbm tbn tbr tbt tbu tma tmb tmm tmn tmr tmt tmu tna tnb tnm tnn tnr tnt tra trb trm trn trr trt tru tta ttb ttm ttn ttr ttt ttu tua tub tum tun tur tut tuu ua- uaa uab uam uan uar uat uau uba ubb ubn ubr ubt ubu um- uma umb umm umn umr umt umu un- una unb unm unn unr unt unu ur- ura urb urm urn urr urt uru uta utb utm utn utr utt utu uua uum uun uur uut uuu