a-a a-t aaa aag aao aar aat ag- aga agg ago agr agt aoa aog aoo aor aot ar- ara arg aro arr art at- ata atg ato atr att gaa gag gao gar gat gga ggg ggo ggr ggt goa gog goo gor got gra grg gro grr grt gta gtg gto gtr gtt oaa oag oao oar oat oga ogg ogo ogt oo- ooa oog ooo oor oot or- ora org oro orr ort ot- ota otg oto otr ott ra- raa rag rao rar rat rga rgg rgo rgr rgt roa rog roo ror rot rra rrg rrr rrt rta rtg rto rtr rtt taa tag tao tar tat tga tgg tgo tgr tgt to- toa tog too tor tot tra trg tro trr trt tta ttg tto ttr ttt