a-a a-b a-c aaa aab aac aag aam aan aao ab- aba abb abc abg abm abn abo ac- aca acb acc acg acm acn aco ag- aga agb agc agg agm agn ago ama amb amc amg amm amn amo an- ana anb anc ang anm ann ano aoa aob aoc aog aom aon aoo baa bab bac bag bam ban bao bba bbb bbc bbg bbm bbn bbo bca bcb bcc bcg bcm bcn bco bga bgb bgc bgg bgm bgn bgo bma bmb bmc bmg bmm bmn bmo bna bnb bnc bng bnn bno boa bob boc bog bom bon boo c-- caa cab cac cag cam can cao cba cbb cbc cbg cbm cbn cbo cca ccb ccc ccg ccm ccn cco cga cgb cgc cgg cgm cgn cgo cma cmb cmc cmg cmm cmn cmo cn- cna cnb cnc cng cnm cnn cno co- coa cob coc cog com con coo gaa gab gac gag gam gan gao gba gbc gbg gbm gbn gbo gca gcb gcc gcg gcm gcn gco gga ggb ggc ggg ggm ggn ggo gma gmb gmc gmg gmm gmn gmo gna gnb gnc gnm gnn gno goa gob goc gog gom gon goo m-o maa mab mac mag mam man mao mba mbb mbc mbg mbm mbo mc- mca mcb mcc mcg mcm mcn mco mga mgb mgc mgm mgn mgo mma mmb mmc mmg mmm mmn mmo mna mnb mnc mng mnm mnn mno moa mob moc mog mom mon moo naa nab nac nag nam nan nao nba nbb nbc nbg nbm nbn nbo nca ncb ncc ncg ncm ncn nco nga ngb ngc ngg ngm ngn ngo nma nmb nmc nmg nmm nmn nmo nna nnb nnc nng nnm nnn nno no- noa nob noc nog nom non noo oaa oab oac oag oam oan oao ob- oba obb obc obg obm obn obo oc- oca ocb occ ocg ocm ocn oco oga ogc ogg ogn ogo om- oma omb omc omg omm omn omo on- ona onb onc ong onn ono oo- ooa oob ooc oog oom oon ooo