a-a a-c aaa aac aad aam aan ac- aca acc acd acm acn ad- ada adc add adm adn ama amc amd amm amn an- ana anc and anm ann c-- caa cac cad cam can cca ccc ccd ccm ccn cda cdc cdd cdm cdn cma cmc cmd cmm cmn cn- cna cnc cnd cnm cnn daa dac dad dam dan dca dcc dcd dcm dcn dda ddc ddd ddm ddn dma dmc dmd dmm dmn dna dnc dnd dnm dnn maa mac mad mam man mc- mca mcc mcd mcm mcn mda mdc mdd mdm mdn mma mmc mmd mmm mmn mna mnc mnm mnn naa nac nad nam nan nca ncc ncd ncm ncn nda ndc ndd ndm ndn nma nmc nmd nmm nmn nna nnc nnm nnn