a-a a-b aaa aab aah aam aao ab- aba abb abh abm abo aha ahb ahh ahm aho ama amb amh amm amo aoa aob aoh aom aoo baa bab bah bam bao bba bbb bbh bbm bbo bha bhb bhh bhm bho bma bmb bmh bmm bmo boa bob boh bom boo haa hab hah ham hao hba hbb hbh hbm hbo hha hhb hhh hhm hho hma hmb hmh hmm hmo hoa hob hoh hom hoo m-o maa mab mah mam mao mba mbb mbh mbm mbo mha mhh mhm mho mma mmb mmh mmm mmo moa mob moh mom moo oaa oab oah oam oao ob- oba obb obh obm obo oha ohh ohm oho om- oma omb omh omm omo oo- ooa oob ooh oom ooo