a-a a-b aaa aab aak aam aan aar aau ab- aba abb abk abm abn abr abu aka akb akk akm akn akr aku ama amb amk amm amn amr amu an- ana anb ank anm ann anr anu ar- ara arb ark arm arn arr aru au- aua aub auk aum aun aur b-u baa bab bak bam ban bar bau bba bbb bbk bbm bbn bbr bbu bka bkb bkk bkm bkn bkr bma bmb bmk bmm bmn bmr bmu bna bnb bnk bnn bnr bnu bra brb brk brm brn brr bru bua bub buk bum bun bur buu ka- kaa kab kak kam kan kar kau kba kbb kbk kbm kbn kbr kbu kkb kkk kkm kkn kkr kku kma kmb kmk kmm kmu kn- kna knk knm knn knr knu kra krk krn krr kru kub kuk kum kun kur kuu m-r maa mab mak mam man mar mau mba mbb mbk mbm mbr mbu mka mkb mkk mkm mkn mkr mku mma mmb mmk mmm mmn mmr mmu mna mnb mnk mnm mnn mnr mnu mra mrb mrk mrm mrn mrr mru mua mub muk mum mun mur muu naa nab nak nam nan nar nau nba nbb nbk nbm nbn nbr nbu nka nkk nkm nkn nkr nku nma nmb nmk nmm nmn nmr nmu nna nnb nnk nnm nnn nnu nra nrb nrk nrm nrn nrr nru nua nub nuk num nun nur nuu ra- raa rab rak ram ran rar rau rba rbb rbk rbm rbn rbr rbu rkb rkk rkm rku rma rmb rmm rmn rmr rna rnb rnm rnn rnr rnu rra rrb rrk rrm rrn rrr rru rua rub ruk rum run rur ruu ua- uaa uab uak uam uan uar uau uba ubb ubk ubn ubr ubu uka ukb ukk ukn ukr uku um- uma umb umm umn umr umu un- una unb unk unm unn unr unu ur- ura urb urk urm urn urr uru uua uum uun uur uuu