a-a a-t aaa aaf aag aao aar aas aat af- afa aff afg afo afr afs aft ag- aga agf agg ago agr ags agt aoa aof aog aoo aor aos aot ar- ara arf arg aro arr ars art as- asa asf asg aso asr ass ast at- ata atf atg ato atr ats att faa faf fag fao far fas fat ffa fff ffg ffo ffr ffs fft fga fgf fgg fgr fgs fgt foa fof fog foo for fos fot fra frf frg fro frr frs frt fsa fsf fsg fso fsr fss fst fta ftf ftg fto ftr fts ftt gaa gaf gag gao gar gas gat gfa gff gfo gfr gfs gft gga ggg ggo ggr ggs ggt goa gof gog goo gor gos got gra grf grg gro grr grs grt gsa gsf gsg gso gsr gss gst gta gtf gtg gto gtr gts gtt oaa oaf oag oao oar oas oat of- ofa off ofg ofo ofr ofs oft oga ogf ogg ogo ogs ogt oo- ooa oof oog ooo oor oos oot or- ora orf org oro orr ors ort os- osa osf osg oso osr oss ost ot- ota otf otg oto otr ots ott ra- raa raf rag rao rar ras rat rfa rff rfg rfo rfr rfs rft rga rgf rgg rgo rgr rgs rgt roa rof rog roo ror ros rot rra rrf rrg rrr rrs rrt rsa rsf rsg rso rsr rss rst rta rtf rtg rto rtr rts rtt saa saf sag sao sar sas sat sfa sff sfg sfo sfr sfs sft sga sgf sgg sgo sgr sgs sgt soa sof sog soo sor sos sot sr- sra srf srg sro srr srs srt ss- ssa ssf ssg sso ssr sss sst sta stf stg sto str sts stt taa taf tag tao tar tas tat tfa tff tfg tfo tfr tfs tft tga tgf tgg tgo tgr tgs tgt to- toa tof tog too tor tos tot tra trf trg tro trr trs trt tsa tsf tsg tso tsr tss tst tta ttf ttg tto ttr tts ttt