a-a a-b aaa aab aag aam aao ab- aba abb abg abm abo ag- aga agb agg agm ago ama amb amg amm amo aoa aob aog aom aoo baa bab bag bam bao bba bbb bbg bbm bbo bga bgb bgg bgm bgo bma bmb bmg bmm bmo boa bob bog bom boo gaa gab gag gam gao gba gbg gbm gbo gga ggb ggg ggm ggo gma gmb gmg gmm gmo goa gob gog gom goo m-o maa mab mag mam mao mba mbb mbg mbm mbo mga mgb mgm mgo mma mmb mmg mmm mmo moa mob mog mom moo oaa oab oag oam oao ob- oba obb obg obm obo oga ogg ogo om- oma omb omg omm omo oo- ooa oob oog oom ooo