a-a a-c aaa aac aad aag aan ac- aca acc acd acg acn ad- ada adc add adg adn ag- aga agc agd agg agn an- ana anc and ang ann c-- caa cac cad cag can cca ccc ccd ccg ccn cda cdc cdd cdg cdn cga cgc cgd cgg cgn cn- cna cnc cnd cng cnn daa dac dad dag dan dca dcc dcd dcg dcn dda ddc ddd ddg ddn dga dgc dgd dgg dgn dna dnc dnd dng dnn g-d gaa gac gad gag gan gca gcc gcd gcg gcn gda gdc gdd gdn gga ggc ggd ggg ggn gna gnc gnd gnn naa nac nad nag nan nca ncc ncd ncg ncn nda ndc ndd ndg ndn nga ngc ngd ngg ngn nna nnc nng nnn