a-a a-c aaa aac aae aak aam aao ac- aca acc ace ack acm aco aea aec aee aek aem aeo aka akc ake akk akm ako ama amc ame amk amm amo aoa aoc aoe aok aom aoo c-- caa cac cae cak cam cao cca ccc cce cck ccm cco ce- cea cec cee cek cem ceo cka ckc ckm cko cma cmc cme cmk cmm cmo co- coa coc coe cok com coo eaa eac eae eak eam eao ec- eca ecc ece eck ecm eco eea eec eee eek eem eeo eka ekc eke eko em- ema emc eme emk emm emo eo- eoa eoc eoe eok eom eoo ka- kaa kac kae kak kam kao kca kcc kce kck kcm ke- kea kec kee kek kem keo kkc kke kkk kkm kma kmc kme kmk kmm kmo koa koc koe kok kom koo m-o maa mac mae mak mam mao mc- mca mcc mce mck mcm mco mea mec mee mek mem meo mka mkc mke mkk mkm mko mma mmc mme mmk mmm mmo moa moc moe mok mom moo oaa oac oae oak oam oao oc- oca occ ock ocm oco oea oec oee oem oeo oka okc oke okk oko om- oma omc ome omm omo oo- ooa ooc ook oom ooo