-er a-a a-c a-t aaa aac aad aae aag aao aar aat ac- aca acc acd ace acg aco acr act ad- ada adc add ade adg ado adr adt aea aec aed aee aeg aeo aer aet ag- aga agc agd age agg ago agr agt aoa aoc aod aoe aog aoo aor aot ar- ara arc ard are arg aro arr art at- ata atc atd ate atg ato atr att c-- caa cac cad cae cag cao car cat cca ccc ccd cce ccg cco ccr cct cda cdc cdd cde cdg cdo cdr cdt ce- cea cec ced cee ceg ceo cer cet cga cgc cgd cge cgg cgo cgr cgt co- coa coc cod coe cog coo cor cot cra crc crd cre crg cro crr crt cta ctc ctd cte ctg cto ctr ctt daa dac dad dae dag dao dar dat dca dcc dcd dce dcg dco dcr dct dda ddc ddd dde ddg ddo ddr ddt de- dea dec ded dee deg deo der det dga dgc dgd dge dgg dgr dgt doa doc dod doe dog doo dor dot dra drc drd dre drg dro drr drt dta dtc dtd dte dtg dto dtr dtt eaa eac ead eae eag eao ear eat ec- eca ecc ecd ece ecg eco ecr ect ed- eda edc edd ede edg edo edr edt eea eec eed eee eeg eeo eer eet ega egc egd ege egg ego egr egt eo- eoa eoc eod eoe eog eoo eor eot era erc erd ere erg ero err ert eta etc etd ete etg eto etr ett g-d gaa gac gad gae gag gao gar gat gca gcc gcd gce gcg gco gcr gct gda gdc gdd gde gdo gdr gdt ge- gea gec ged gee geg geo ger get gga ggc ggd ggg ggo ggr ggt goa goc god goe gog goo gor got gra grc grd gre grg gro grr grt gta gtc gtd gte gtg gto gtr gtt oaa oac oad oae oag oao oar oat oc- oca occ ocd ocg oco ocr oct oda odc odd ode odg odo odr odt oea oec oed oee oeg oeo oer oet oga ogc ogd oge ogg ogo ogt oo- ooa ooc ood oog ooo oor oot or- ora orc ord ore org oro orr ort ot- ota otc otd ote otg oto otr ott ra- raa rac rad rae rag rao rar rat rca rcc rcd rce rcg rco rcr rct rda rdc rdd rde rdg rdo rdr rdt re- rea rec red ree reg reo rer ret rga rgc rgd rge rgg rgo rgr rgt roa roc rod roe rog roo ror rot rra rrc rrd rrg rrr rrt rta rtc rtd rte rtg rto rtr rtt taa tac tad tae tag tao tar tat tca tcc tcd tce tcg tco tcr tct tda tdc tdd tde tdg tdo tdr tdt te- tea tec ted tee teg teo ter tet tga tgc tge tgg tgo tgr tgt to- toa toc tod toe tog too tor tot tra trc trd tre trg tro trr trt tta ttc ttd tte ttg tto ttr ttt