a-a a-c aaa aac aam aan aao ac- aca acc acm acn aco ama amc amm amn amo an- ana anc anm ann ano aoa aoc aom aon aoo c-- caa cac cam can cao cca ccc ccm ccn cco cma cmc cmm cmn cmo cn- cna cnc cnm cnn cno co- coa coc com con coo m-o maa mac mam man mao mc- mca mcc mcm mcn mco mma mmc mmm mmn mmo mna mnc mnm mnn mno moa moc mom mon moo naa nac nam nan nao nca ncc ncm ncn nco nma nmc nmm nmn nmo nna nnc nnm nnn nno no- noa noc nom non noo oaa oac oam oan oao oc- oca occ ocm ocn oco om- oma omc omm omn omo on- ona onc onn ono oo- ooa ooc oom oon ooo