-er a-a a-c a-t aaa aac aae aag aao aar aas aat ac- aca acc ace acg aco acr acs act aea aec aee aeg aeo aer aes aet ag- aga agc age agg ago agr ags agt aoa aoc aoe aog aoo aor aos aot ar- ara arc are arg aro arr ars art as- asa asc ase asg aso asr ass ast at- ata atc ate atg ato atr ats att c-- caa cac cae cag cao car cas cat cca ccc cce ccg cco ccr ccs cct ce- cea cec cee ceg ceo cer ces cet cga cgc cge cgg cgo cgr cgs cgt co- coa coc coe cog coo cor cos cot cra crc cre crg cro crr crs crt csa csc cse csg cso csr css cst cta ctc cte ctg cto ctr cts ctt eaa eac eae eag eao ear eas eat ec- eca ecc ece ecg eco ecr ecs ect eea eec eee eeg eeo eer ees eet ega egc ege egg ego egr egs egt eo- eoa eoc eoe eog eoo eor eos eot era erc ere erg ero err ers ert es- esa esc ese esg eso esr ess est eta etc ete etg eto etr ets ett gaa gac gae gag gao gar gas gat gca gcc gce gcg gco gcr gcs gct ge- gea gec gee geg geo ger ges get gga ggc ggg ggo ggr ggs ggt goa goc goe gog goo gor gos got gra grc gre grg gro grr grs grt gsa gsc gse gsg gso gsr gss gst gta gtc gte gtg gto gtr gts gtt oaa oac oae oag oao oar oas oat oc- oca occ ocg oco ocr ocs oct oea oec oee oeg oeo oer oes oet oga ogc oge ogg ogo ogs ogt oo- ooa ooc oog ooo oor oos oot or- ora orc ore org oro orr ors ort os- osa osc ose osg oso osr oss ost ot- ota otc ote otg oto otr ots ott ra- raa rac rae rag rao rar ras rat rca rcc rce rcg rco rcr rcs rct re- rea rec ree reg reo rer res ret rga rgc rge rgg rgo rgr rgs rgt roa roc roe rog roo ror ros rot rra rrc rrg rrr rrs rrt rsa rsc rse rsg rso rsr rss rst rta rtc rte rtg rto rtr rts rtt saa sac sae sag sao sar sas sat sca scc sce scg sco scr scs sct se- sea sec see seg seo ser ses set sga sgc sge sgg sgo sgr sgs sgt soa soc soe sog soo sor sos sot sr- sra src sre srg sro srr srs srt ss- ssa ssc sse ssg sso ssr sss sst sta stc ste stg sto str sts stt taa tac tae tag tao tar tas tat tca tcc tce tcg tco tcr tcs tct te- tea tec tee teg teo ter tes tet tga tgc tge tgg tgo tgr tgs tgt to- toa toc toe tog too tor tos tot tra trc tre trg tro trr trs trt tsa tsc tse tsg tso tsr tss tst tta ttc tte ttg tto ttr tts ttt