a-a a-b aaa aab aah aam aan aao ab- aba abb abh abm abn abo aha ahb ahh ahm ahn aho ama amb amh amm amn amo an- ana anb anh anm ann ano aoa aob aoh aom aon aoo baa bab bah bam ban bao bba bbb bbh bbm bbn bbo bha bhb bhh bhm bho bma bmb bmh bmm bmn bmo bna bnb bnn bno boa bob boh bom bon boo haa hab hah ham han hao hba hbb hbh hbm hbn hbo hha hhb hhh hhm hhn hho hma hmb hmh hmm hmo hna hnb hnh hnn hno hoa hob hoh hom hon hoo m-o maa mab mah mam man mao mba mbb mbh mbm mbo mha mhh mhm mhn mho mma mmb mmh mmm mmn mmo mna mnb mnm mnn mno moa mob moh mom mon moo naa nab nah nam nan nao nba nbb nbm nbn nbo nha nhb nhh nhm nhn nma nmb nmh nmm nmn nmo nna nnb nnh nnm nnn nno no- noa nob noh nom non noo oaa oab oah oam oan oao ob- oba obb obh obm obn obo oha ohh ohm ohn oho om- oma omb omh omm omn omo on- ona onb onh onn ono oo- ooa oob ooh oom oon ooo