a-a a-b aaa aab aae aag aam aao ab- aba abb abe abg abm abo aea aeb aee aeg aem aeo ag- aga agb age agg agm ago ama amb ame amg amm amo aoa aob aoe aog aom aoo baa bab bae bag bam bao bba bbb bbe bbg bbm bbo be- bea beb bee beg bem beo bga bgb bge bgg bgm bgo bma bmb bme bmg bmm bmo boa bob boe bog bom boo eaa eab eae eag eam eao eba ebb ebe ebg ebm ebo eea eeb eee eeg eem eeo ega egb ege egg egm ego em- ema emb eme emg emm emo eo- eoa eob eoe eog eom eoo gaa gab gae gag gam gao gba gbe gbg gbm gbo ge- gea geb gee geg gem geo gga ggb ggg ggm ggo gma gmb gme gmg gmm gmo goa gob goe gog gom goo m-o maa mab mae mag mam mao mba mbb mbe mbg mbm mbo mea meb mee meg mem meo mga mgb mge mgm mgo mma mmb mme mmg mmm mmo moa mob moe mog mom moo oaa oab oae oag oam oao ob- oba obb obe obg obm obo oea oeb oee oeg oem oeo oga oge ogg ogo om- oma omb ome omg omm omo oo- ooa oob oog oom ooo