a-a a-b aaa aab aag aam aan aao ab- aba abb abg abm abn abo ag- aga agb agg agm agn ago ama amb amg amm amn amo an- ana anb ang anm ann ano aoa aob aog aom aon aoo baa bab bag bam ban bao bba bbb bbg bbm bbn bbo bga bgb bgg bgm bgn bgo bma bmb bmg bmm bmn bmo bna bnb bng bnn bno boa bob bog bom bon boo gaa gab gag gam gan gao gba gbg gbm gbn gbo gga ggb ggg ggm ggn ggo gma gmb gmg gmm gmn gmo gna gnb gnm gnn gno goa gob gog gom gon goo m-o maa mab mag mam man mao mba mbb mbg mbm mbo mga mgb mgm mgn mgo mma mmb mmg mmm mmn mmo mna mnb mng mnm mnn mno moa mob mog mom mon moo naa nab nag nam nan nao nba nbb nbg nbm nbn nbo nga ngb ngg ngm ngn ngo nma nmb nmg nmm nmn nmo nna nnb nng nnm nnn nno no- noa nob nog nom non noo oaa oab oag oam oan oao ob- oba obb obg obm obn obo oga ogg ogn ogo om- oma omb omg omm omn omo on- ona onb ong onn ono oo- ooa oob oog oom oon ooo