a-a aaa aag aar aas aax ag- aga agg agr ags agx ar- ara arg arr ars arx as- asa asg asr ass asx ax- axa axr axs axx gaa gag gar gas gga ggg ggr ggs gra grg grr grs grx gsa gsg gsr gss gsx gxa gxs ra- raa rag rar ras rax rga rgg rgr rgs rgx rra rrg rrr rrs rsa rsg rsr rss rsx rxr rxs saa sag sar sas sax sga sgg sgr sgs sgx sr- sra srg srr srs srx ss- ssa ssg ssr sss ssx sxs xaa xag xar xas xrx xsa xss xxx