a-a a-b aaa aab aag aah aam aao ab- aba abb abg abh abm abo ag- aga agb agg agh agm ago aha ahb ahg ahh ahm aho ama amb amg amh amm amo aoa aob aog aoh aom aoo baa bab bag bah bam bao bba bbb bbg bbh bbm bbo bga bgb bgg bgh bgm bgo bha bhb bhg bhh bhm bho bma bmb bmg bmh bmm bmo boa bob bog boh bom boo gaa gab gag gah gam gao gba gbg gbh gbm gbo gga ggb ggg ggh ggm ggo gha ghb ghg ghh gho gma gmb gmg gmh gmm gmo goa gob gog goh gom goo haa hab hag hah ham hao hba hbb hbg hbh hbm hbo hga hgb hgg hgh hgm hgo hha hhb hhg hhh hhm hho hma hmb hmg hmh hmm hmo hoa hob hog hoh hom hoo m-o maa mab mag mah mam mao mba mbb mbg mbh mbm mbo mga mgb mgh mgm mgo mha mhg mhh mhm mho mma mmb mmg mmh mmm mmo moa mob mog moh mom moo oaa oab oag oah oam oao ob- oba obb obg obh obm obo oga ogg ogh ogo oha ohg ohh ohm oho om- oma omb omg omh omm omo oo- ooa oob oog ooh oom ooo