a-a a-t aaa aag aao aas aat ag- aga agg ago ags agt aoa aog aoo aos aot as- asa asg aso ass ast at- ata atg ato ats att gaa gag gao gas gat gga ggg ggo ggs ggt goa gog goo gos got gsa gsg gso gss gst gta gtg gto gts gtt oaa oag oao oas oat oga ogg ogo ogs ogt oo- ooa oog ooo oos oot os- osa osg oso oss ost ot- ota otg oto ots ott saa sag sao sas sat sga sgg sgo sgs sgt soa sog soo sos sot ss- ssa ssg sso sss sst sta stg sto sts stt taa tag tao tas tat tga tgg tgo tgs tgt to- toa tog too tos tot tsa tsg tso tss tst tta ttg tto tts ttt