a-a a-c aaa aac aag aan aao ac- aca acc acg acn aco ag- aga agc agg agn ago an- ana anc ang ann ano aoa aoc aog aon aoo c-- caa cac cag can cao cca ccc ccg ccn cco cga cgc cgg cgn cgo cn- cna cnc cng cnn cno co- coa coc cog con coo gaa gac gag gan gao gca gcc gcg gcn gco gga ggc ggg ggn ggo gna gnc gnn gno goa goc gog gon goo naa nac nag nan nao nca ncc ncg ncn nco nga ngc ngg ngn ngo nna nnc nng nnn nno no- noa noc nog non noo oaa oac oag oan oao oc- oca occ ocg ocn oco oga ogc ogg ogn ogo on- ona onc ong onn ono oo- ooa ooc oog oon ooo