a-a a-b aaa aab aam aan aao aau ab- aba abb abm abn abo abu ama amb amm amn amo amu an- ana anb anm ann ano anu aoa aob aom aon aoo aou au- aua aub aum aun auo b-u baa bab bam ban bao bau bba bbb bbm bbn bbo bbu bma bmb bmm bmn bmo bmu bna bnb bnn bno bnu boa bob bom bon boo bou bua bub bum bun buo buu m-o maa mab mam man mao mau mba mbb mbm mbo mbu mma mmb mmm mmn mmo mmu mna mnb mnm mnn mno mnu moa mob mom mon moo mou mua mub mum mun muu naa nab nam nan nao nau nba nbb nbm nbn nbo nbu nma nmb nmm nmn nmo nmu nna nnb nnm nnn nno nnu no- noa nob nom non noo nou nua nub num nun nuo nuu oaa oab oam oan oao oau ob- oba obb obm obn obo obu om- oma omb omm omn omo omu on- ona onb onn ono onu oo- ooa oob oom oon ooo ou- oua oum oun ouo ua- uaa uab uam uan uao uau uba ubb ubn ubo ubu um- uma umb umm umn umo umu un- una unb unm unn uno unu uoa uob uom uon uoo uua uum uun uuu