a-a a-b aaa aab aak aam aan aao aau ab- aba abb abk abm abn abo abu aka akb akk akm akn ako aku ama amb amk amm amn amo amu an- ana anb ank anm ann ano anu aoa aob aok aom aon aoo aou au- aua aub auk aum aun auo b-u baa bab bak bam ban bao bau bba bbb bbk bbm bbn bbo bbu bka bkb bkk bkm bkn bko bma bmb bmk bmm bmn bmo bmu bna bnb bnk bnn bno bnu boa bob bok bom bon boo bou bua bub buk bum bun buo buu ka- kaa kab kak kam kan kao kau kba kbb kbk kbm kbn kbo kbu kkb kkk kkm kkn kku kma kmb kmk kmm kmo kmu kn- kna knk knm knn kno knu koa kob kok kom kon koo kou kub kuk kum kun kuu m-o maa mab mak mam man mao mau mba mbb mbk mbm mbo mbu mka mkb mkk mkm mkn mko mku mma mmb mmk mmm mmn mmo mmu mna mnb mnk mnm mnn mno mnu moa mob mok mom mon moo mou mua mub muk mum mun muu naa nab nak nam nan nao nau nba nbb nbk nbm nbn nbo nbu nka nkk nkm nkn nko nku nma nmb nmk nmm nmn nmo nmu nna nnb nnk nnm nnn nno nnu no- noa nob nok nom non noo nou nua nub nuk num nun nuo nuu oaa oab oak oam oan oao oau ob- oba obb obk obm obn obo obu oka okb okk oko oku om- oma omb omm omn omo omu on- ona onb onk onn ono onu oo- ooa oob ook oom oon ooo ou- oua ouk oum oun ouo ua- uaa uab uak uam uan uao uau uba ubb ubk ubn ubo ubu uka ukb ukk ukn uku um- uma umb umm umn umo umu un- una unb unk unm unn uno unu uoa uob uok uom uon uoo uua uum uun uuu