a-a a-c a-t aaa aac aaf aag aao aar aas aat ac- aca acc acf acg aco acr acs act af- afa afc aff afg afo afr afs aft ag- aga agc agf agg ago agr ags agt aoa aoc aof aog aoo aor aos aot ar- ara arc arf arg aro arr ars art as- asa asc asf asg aso asr ass ast at- ata atc atf atg ato atr ats att c-- caa cac caf cag cao car cas cat cca ccc ccf ccg cco ccr ccs cct cfa cfc cff cfg cfo cfr cfs cft cga cgc cgg cgo cgr cgs cgt co- coa coc cof cog coo cor cos cot cra crc crf crg cro crr crs crt csa csc csf csg cso csr css cst cta ctc ctf ctg cto ctr cts ctt faa fac faf fag fao far fas fat fca fcc fcf fcg fco fcr fcs fct ffa ffc fff ffg ffo ffr ffs fft fga fgc fgf fgg fgr fgs fgt foa foc fof fog foo for fos fot fra frc frf frg fro frr frs frt fsa fsc fsf fsg fso fsr fss fst fta ftc ftf ftg fto ftr fts ftt gaa gac gaf gag gao gar gas gat gca gcc gcf gcg gco gcr gcs gct gfa gfc gff gfo gfr gfs gft gga ggc ggg ggo ggr ggs ggt goa goc gof gog goo gor gos got gra grc grf grg gro grr grs grt gsa gsc gsf gsg gso gsr gss gst gta gtc gtf gtg gto gtr gts gtt oaa oac oaf oag oao oar oas oat oc- oca occ ocf ocg oco ocr ocs oct of- ofa ofc off ofg ofo ofr ofs oft oga ogc ogf ogg ogo ogs ogt oo- ooa ooc oof oog ooo oor oos oot or- ora orc orf org oro orr ors ort os- osa osc osf osg oso osr oss ost ot- ota otc otf otg oto otr ots ott ra- raa rac raf rag rao rar ras rat rca rcc rcf rcg rco rcr rcs rct rfa rfc rff rfg rfo rfr rfs rft rga rgc rgf rgg rgo rgr rgs rgt roa roc rof rog roo ror ros rot rra rrc rrf rrg rrr rrs rrt rsa rsc rsf rsg rso rsr rss rst rta rtc rtf rtg rto rtr rts rtt saa sac saf sag sao sar sas sat sca scc scf scg sco scr scs sct sfa sfc sff sfg sfo sfr sfs sft sga sgc sgf sgg sgo sgr sgs sgt soa soc sof sog soo sor sos sot sr- sra src srf srg sro srr srs srt ss- ssa ssc ssf ssg sso ssr sss sst sta stc stf stg sto str sts stt taa tac taf tag tao tar tas tat tca tcc tcf tcg tco tcr tcs tct tfa tfc tff tfg tfo tfr tfs tft tga tgc tgf tgg tgo tgr tgs tgt to- toa toc tof tog too tor tos tot tra trc trf trg tro trr trs trt tsa tsc tsf tsg tso tsr tss tst tta ttc ttf ttg tto ttr tts ttt