a-a a-b aaa aab aae aag aak aam aao ab- aba abb abe abg abk abm abo aea aeb aee aeg aek aem aeo ag- aga agb age agg agk agm ago aka akb ake akg akk akm ako ama amb ame amg amk amm amo aoa aob aoe aog aok aom aoo baa bab bae bag bak bam bao bba bbb bbe bbg bbk bbm bbo be- bea beb bee beg bek bem beo bga bgb bge bgg bgk bgm bgo bka bkb bke bkg bkk bkm bko bma bmb bme bmg bmk bmm bmo boa bob boe bog bok bom boo eaa eab eae eag eak eam eao eba ebb ebe ebg ebk ebm ebo eea eeb eee eeg eek eem eeo ega egb ege egg egm ego eka ekb eke ekg eko em- ema emb eme emg emk emm emo eo- eoa eob eoe eog eok eom eoo gaa gab gae gag gak gam gao gba gbe gbg gbk gbm gbo ge- gea geb gee geg gek gem geo gga ggb ggg ggm ggo gka gkb gkm gko gma gmb gme gmg gmm gmo goa gob goe gog gok gom goo ka- kaa kab kae kag kak kam kao kba kbb kbe kbk kbm kbo ke- kea keb kee keg kek kem keo kga kgb kgm kgo kkb kke kkk kkm kma kmb kme kmg kmk kmm kmo koa kob koe kog kok kom koo m-o maa mab mae mag mak mam mao mba mbb mbe mbg mbk mbm mbo mea meb mee meg mek mem meo mga mgb mge mgk mgm mgo mka mkb mke mkg mkk mkm mko mma mmb mme mmg mmk mmm mmo moa mob moe mog mok mom moo oaa oab oae oag oak oam oao ob- oba obb obe obg obk obm obo oea oeb oee oeg oem oeo oga oge ogg ogo oka okb oke okg okk oko om- oma omb ome omg omm omo oo- ooa oob oog ook oom ooo