a-a a-c aaa aac aag aao aar aas ac- aca acc acg aco acr acs ag- aga agc agg ago agr ags aoa aoc aog aoo aor aos ar- ara arc arg aro arr ars as- asa asc asg aso asr ass c-- caa cac cag cao car cas cca ccc ccg cco ccr ccs cga cgc cgg cgo cgr cgs co- coa coc cog coo cor cos cra crc crg cro crr crs csa csc csg cso csr css gaa gac gag gao gar gas gca gcc gcg gco gcr gcs gga ggc ggg ggo ggr ggs goa goc gog goo gor gos gra grc grg gro grr grs gsa gsc gsg gso gsr gss oaa oac oag oao oar oas oc- oca occ ocg oco ocr ocs oga ogc ogg ogo ogs oo- ooa ooc oog ooo oor oos or- ora orc org oro orr ors os- osa osc osg oso osr oss ra- raa rac rag rao rar ras rca rcc rcg rco rcr rcs rga rgc rgg rgo rgr rgs roa roc rog roo ror ros rra rrc rrg rrr rrs rsa rsc rsg rso rsr rss saa sac sag sao sar sas sca scc scg sco scr scs sga sgc sgg sgo sgr sgs soa soc sog soo sor sos sr- sra src srg sro srr srs ss- ssa ssc ssg sso ssr sss