a-a a-c aaa aac aae aam aao ac- aca acc ace acm aco aea aec aee aem aeo ama amc ame amm amo aoa aoc aoe aom aoo c-- caa cac cae cam cao cca ccc cce ccm cco ce- cea cec cee cem ceo cma cmc cme cmm cmo co- coa coc coe com coo eaa eac eae eam eao ec- eca ecc ece ecm eco eea eec eee eem eeo em- ema emc eme emm emo eo- eoa eoc eoe eom eoo m-o maa mac mae mam mao mc- mca mcc mce mcm mco mea mec mee mem meo mma mmc mme mmm mmo moa moc moe mom moo oaa oac oae oam oao oc- oca occ ocm oco oea oec oee oem oeo om- oma omc ome omm omo oo- ooa ooc oom ooo