-er a-a a-c a-t aaa aac aad aae aag aao aar aas aat ac- aca acc acd ace acg aco acr acs act ad- ada adc add ade adg ado adr ads adt aea aec aed aee aeg aeo aer aes aet ag- aga agc agd age agg ago agr ags agt aoa aoc aod aoe aog aoo aor aos aot ar- ara arc ard are arg aro arr ars art as- asa asc asd ase asg aso asr ass ast at- ata atc atd ate atg ato atr ats att c-- caa cac cad cae cag cao car cas cat cca ccc ccd cce ccg cco ccr ccs cct cda cdc cdd cde cdg cdo cdr cds cdt ce- cea cec ced cee ceg ceo cer ces cet cga cgc cgd cge cgg cgo cgr cgs cgt co- coa coc cod coe cog coo cor cos cot cra crc crd cre crg cro crr crs crt csa csc csd cse csg cso csr css cst cta ctc ctd cte ctg cto ctr cts ctt daa dac dad dae dag dao dar das dat dca dcc dcd dce dcg dco dcr dcs dct dda ddc ddd dde ddg ddo ddr dds ddt de- dea dec ded dee deg deo der des det dga dgc dgd dge dgg dgr dgs dgt doa doc dod doe dog doo dor dos dot dra drc drd dre drg dro drr drs drt dsa dsc dsd dse dsg dso dsr dss dst dta dtc dtd dte dtg dto dtr dts dtt eaa eac ead eae eag eao ear eas eat ec- eca ecc ecd ece ecg eco ecr ecs ect ed- eda edc edd ede edg edo edr eds edt eea eec eed eee eeg eeo eer ees eet ega egc egd ege egg ego egr egs egt eo- eoa eoc eod eoe eog eoo eor eos eot era erc erd ere erg ero err ers ert es- esa esc esd ese esg eso esr ess est eta etc etd ete etg eto etr ets ett g-d gaa gac gad gae gag gao gar gas gat gca gcc gcd gce gcg gco gcr gcs gct gda gdc gdd gde gdo gdr gds gdt ge- gea gec ged gee geg geo ger ges get gga ggc ggd ggg ggo ggr ggs ggt goa goc god goe gog goo gor gos got gra grc grd gre grg gro grr grs grt gsa gsc gsd gse gsg gso gsr gss gst gta gtc gtd gte gtg gto gtr gts gtt oaa oac oad oae oag oao oar oas oat oc- oca occ ocd ocg oco ocr ocs oct oda odc odd ode odg odo odr ods odt oea oec oed oee oeg oeo oer oes oet oga ogc ogd oge ogg ogo ogs ogt oo- ooa ooc ood oog ooo oor oos oot or- ora orc ord ore org oro orr ors ort os- osa osc osd ose osg oso osr oss ost ot- ota otc otd ote otg oto otr ots ott ra- raa rac rad rae rag rao rar ras rat rca rcc rcd rce rcg rco rcr rcs rct rda rdc rdd rde rdg rdo rdr rds rdt re- rea rec red ree reg reo rer res ret rga rgc rgd rge rgg rgo rgr rgs rgt roa roc rod roe rog roo ror ros rot rra rrc rrd rrg rrr rrs rrt rsa rsc rsd rse rsg rso rsr rss rst rta rtc rtd rte rtg rto rtr rts rtt saa sac sad sae sag sao sar sas sat sca scc scd sce scg sco scr scs sct sda sdc sdd sde sdg sdo sdr sds sdt se- sea sec sed see seg seo ser ses set sga sgc sgd sge sgg sgo sgr sgs sgt soa soc sod soe sog soo sor sos sot sr- sra src srd sre srg sro srr srs srt ss- ssa ssc ssd sse ssg sso ssr sss sst sta stc std ste stg sto str sts stt taa tac tad tae tag tao tar tas tat tca tcc tcd tce tcg tco tcr tcs tct tda tdc tdd tde tdg tdo tdr tds tdt te- tea tec ted tee teg teo ter tes tet tga tgc tge tgg tgo tgr tgs tgt to- toa toc tod toe tog too tor tos tot tra trc trd tre trg tro trr trs trt tsa tsc tsd tse tsg tso tsr tss tst tta ttc ttd tte ttg tto ttr tts ttt