a-a aaa aag aak aao aar aas ag- aga agg agk ago agr ags aka akg akk ako akr aks aoa aog aok aoo aor aos ar- ara arg ark aro arr ars as- asa asg ask aso asr ass gaa gag gak gao gar gas gga ggg ggo ggr ggs gka gko gks goa gog gok goo gor gos gra grg grk gro grr grs gsa gsg gsk gso gsr gss ka- kaa kag kak kao kar kas kga kgo kgs kkk kkr kks koa kog kok koo kor kos kra krg krk kro krr krs ksa ksg ksk kso ksr kss oaa oag oak oao oar oas oga ogg ogo ogs oka okg okk oko okr oks oo- ooa oog ook ooo oor oos or- ora org ork oro orr ors os- osa osg osk oso osr oss ra- raa rag rak rao rar ras rga rgg rgk rgo rgr rgs rkg rkk rko rks roa rog rok roo ror ros rra rrg rrk rrr rrs rsa rsg rsk rso rsr rss saa sag sak sao sar sas sga sgg sgk sgo sgr sgs sk- ska skg skk sko skr sks soa sog sok soo sor sos sr- sra srg srk sro srr srs ss- ssa ssg ssk sso ssr sss