-er a-a a-c a-t aaa aac aae aag aao aar aat ac- aca acc ace acg aco acr act aea aec aee aeg aeo aer aet ag- aga agc age agg ago agr agt aoa aoc aoe aog aoo aor aot ar- ara arc are arg aro arr art at- ata atc ate atg ato atr att c-- caa cac cae cag cao car cat cca ccc cce ccg cco ccr cct ce- cea cec cee ceg ceo cer cet cga cgc cge cgg cgo cgr cgt co- coa coc coe cog coo cor cot cra crc cre crg cro crr crt cta ctc cte ctg cto ctr ctt eaa eac eae eag eao ear eat ec- eca ecc ece ecg eco ecr ect eea eec eee eeg eeo eer eet ega egc ege egg ego egr egt eo- eoa eoc eoe eog eoo eor eot era erc ere erg ero err ert eta etc ete etg eto etr ett gaa gac gae gag gao gar gat gca gcc gce gcg gco gcr gct ge- gea gec gee geg geo ger get gga ggc ggg ggo ggr ggt goa goc goe gog goo gor got gra grc gre grg gro grr grt gta gtc gte gtg gto gtr gtt oaa oac oae oag oao oar oat oc- oca occ ocg oco ocr oct oea oec oee oeg oeo oer oet oga ogc oge ogg ogo ogt oo- ooa ooc oog ooo oor oot or- ora orc ore org oro orr ort ot- ota otc ote otg oto otr ott ra- raa rac rae rag rao rar rat rca rcc rce rcg rco rcr rct re- rea rec ree reg reo rer ret rga rgc rge rgg rgo rgr rgt roa roc roe rog roo ror rot rra rrc rrg rrr rrt rta rtc rte rtg rto rtr rtt taa tac tae tag tao tar tat tca tcc tce tcg tco tcr tct te- tea tec tee teg teo ter tet tga tgc tge tgg tgo tgr tgt to- toa toc toe tog too tor tot tra trc tre trg tro trr trt tta ttc tte ttg tto ttr ttt