a-a aaa aag aao aar aas ag- aga agg ago agr ags aoa aog aoo aor aos ar- ara arg aro arr ars as- asa asg aso asr ass gaa gag gao gar gas gga ggg ggo ggr ggs goa gog goo gor gos gra grg gro grr grs gsa gsg gso gsr gss oaa oag oao oar oas oga ogg ogo ogs oo- ooa oog ooo oor oos or- ora org oro orr ors os- osa osg oso osr oss ra- raa rag rao rar ras rga rgg rgo rgr rgs roa rog roo ror ros rra rrg rrr rrs rsa rsg rso rsr rss saa sag sao sar sas sga sgg sgo sgr sgs soa sog soo sor sos sr- sra srg sro srr srs ss- ssa ssg sso ssr sss