a-a a-b aaa aab aam aan aar aau ab- aba abb abm abn abr abu ama amb amm amn amr amu an- ana anb anm ann anr anu ar- ara arb arm arn arr aru au- aua aub aum aun aur b-u baa bab bam ban bar bau bba bbb bbm bbn bbr bbu bma bmb bmm bmn bmr bmu bna bnb bnn bnr bnu bra brb brm brn brr bru bua bub bum bun bur buu m-r maa mab mam man mar mau mba mbb mbm mbr mbu mma mmb mmm mmn mmr mmu mna mnb mnm mnn mnr mnu mra mrb mrm mrn mrr mru mua mub mum mun mur muu naa nab nam nan nar nau nba nbb nbm nbn nbr nbu nma nmb nmm nmn nmr nmu nna nnb nnm nnn nnu nra nrb nrm nrn nrr nru nua nub num nun nur nuu ra- raa rab ram ran rar rau rba rbb rbm rbn rbr rbu rma rmb rmm rmn rmr rna rnb rnm rnn rnr rnu rra rrb rrm rrn rrr rru rua rub rum run rur ruu ua- uaa uab uam uan uar uau uba ubb ubn ubr ubu um- uma umb umm umn umr umu un- una unb unm unn unr unu ur- ura urb urm urn urr uru uua uum uun uur uuu