a-a a-c aaa aac aag aan aao aas ac- aca acc acg acn aco acs ag- aga agc agg agn ago ags an- ana anc ang ann ano ans aoa aoc aog aon aoo aos as- asa asc asg asn aso ass c-- caa cac cag can cao cas cca ccc ccg ccn cco ccs cga cgc cgg cgn cgo cgs cn- cna cnc cng cnn cno cns co- coa coc cog con coo cos csa csc csg csn cso css gaa gac gag gan gao gas gca gcc gcg gcn gco gcs gga ggc ggg ggn ggo ggs gna gnc gnn gno gns goa goc gog gon goo gos gsa gsc gsg gsn gso gss naa nac nag nan nao nas nca ncc ncg ncn nco ncs nga ngc ngg ngn ngo ngs nna nnc nng nnn nno nns no- noa noc nog non noo nos nsa nsc nsg nsn nso nss oaa oac oag oan oao oas oc- oca occ ocg ocn oco ocs oga ogc ogg ogn ogo ogs on- ona onc ong onn ono ons oo- ooa ooc oog oon ooo oos os- osa osc osg osn oso oss saa sac sag san sao sas sca scc scg scn sco scs sga sgc sgg sgn sgo sgs sna snc sng snn sno sns soa soc sog son soo sos ss- ssa ssc ssg ssn sso sss