a-a a-c aaa aac aag aao aas ac- aca acc acg aco acs ag- aga agc agg ago ags aoa aoc aog aoo aos as- asa asc asg aso ass c-- caa cac cag cao cas cca ccc ccg cco ccs cga cgc cgg cgo cgs co- coa coc cog coo cos csa csc csg cso css gaa gac gag gao gas gca gcc gcg gco gcs gga ggc ggg ggo ggs goa goc gog goo gos gsa gsc gsg gso gss oaa oac oag oao oas oc- oca occ ocg oco ocs oga ogc ogg ogo ogs oo- ooa ooc oog ooo oos os- osa osc osg oso oss saa sac sag sao sas sca scc scg sco scs sga sgc sgg sgo sgs soa soc sog soo sos ss- ssa ssc ssg sso sss