-er a-a a-c a-t aaa aac aad aae aag aan aar aas aat ac- aca acc acd ace acg acn acr acs act ad- ada adc add ade adg adn adr ads adt aea aec aed aee aeg aen aer aes aet ag- aga agc agd age agg agn agr ags agt an- ana anc and ane ang ann anr ans ant ar- ara arc ard are arg arn arr ars art as- asa asc asd ase asg asn asr ass ast at- ata atc atd ate atg atn atr ats att c-- caa cac cad cae cag can car cas cat cca ccc ccd cce ccg ccn ccr ccs cct cda cdc cdd cde cdg cdn cdr cds cdt ce- cea cec ced cee ceg cen cer ces cet cga cgc cgd cge cgg cgn cgr cgs cgt cn- cna cnc cnd cne cng cnn cnr cns cnt cra crc crd cre crg crn crr crs crt csa csc csd cse csg csn csr css cst cta ctc ctd cte ctg ctn ctr cts ctt daa dac dad dae dag dan dar das dat dca dcc dcd dce dcg dcn dcr dcs dct dda ddc ddd dde ddg ddn ddr dds ddt de- dea dec ded dee deg den der des det dga dgc dgd dge dgg dgn dgr dgs dgt dna dnc dnd dne dng dnn dnr dns dnt dra drc drd dre drg drn drr drs drt dsa dsc dsd dse dsg dsn dsr dss dst dta dtc dtd dte dtg dtn dtr dts dtt eaa eac ead eae eag ean ear eas eat ec- eca ecc ecd ece ecg ecn ecr ecs ect ed- eda edc edd ede edg edn edr eds edt eea eec eed eee eeg een eer ees eet ega egc egd ege egg egn egr egs egt en- ena enc end ene eng enn enr ens ent era erc erd ere erg ern err ers ert es- esa esc esd ese esg esn esr ess est eta etc etd ete etg etn etr ets ett g-d gaa gac gad gae gag gan gar gas gat gca gcc gcd gce gcg gcn gcr gcs gct gda gdc gdd gde gdn gdr gds gdt ge- gea gec ged gee geg gen ger ges get gga ggc ggd ggg ggn ggr ggs ggt gna gnc gnd gne gnn gnr gns gnt gra grc grd gre grg grn grr grs grt gsa gsc gsd gse gsg gsn gsr gss gst gta gtc gtd gte gtg gtn gtr gts gtt naa nac nad nae nag nan nar nas nat nca ncc ncd nce ncg ncn ncr ncs nct nda ndc ndd nde ndg ndn ndr nds ndt ne- nea nec ned nee neg nen ner nes net nga ngc ngd nge ngg ngn ngs ngt nna nnc nne nng nnn nns nnt nra nrc nrd nre nrg nrn nrr nrs nrt nsa nsc nsd nse nsg nsn nsr nss nst nta ntc ntd nte ntg ntn ntr nts ntt ra- raa rac rad rae rag ran rar ras rat rca rcc rcd rce rcg rcn rcr rcs rct rda rdc rdd rde rdg rdn rdr rds rdt re- rea rec red ree reg ren rer res ret rga rgc rgd rge rgg rgn rgr rgs rgt rna rnc rnd rng rnn rnr rns rnt rra rrc rrd rrg rrn rrr rrs rrt rsa rsc rsd rse rsg rsn rsr rss rst rta rtc rtd rte rtg rtn rtr rts rtt saa sac sad sae sag san sar sas sat sca scc scd sce scg scn scr scs sct sda sdc sdd sde sdg sdn sdr sds sdt se- sea sec sed see seg sen ser ses set sga sgc sgd sge sgg sgn sgr sgs sgt sna snc snd sne sng snn snr sns snt sr- sra src srd sre srg srn srr srs srt ss- ssa ssc ssd sse ssg ssn ssr sss sst sta stc std ste stg stn str sts stt taa tac tad tae tag tan tar tas tat tca tcc tcd tce tcg tcn tcr tcs tct tda tdc tdd tde tdg tdn tdr tds tdt te- tea tec ted tee teg ten ter tes tet tga tgc tge tgg tgn tgr tgs tgt tna tnc tnd tne tng tnn tnr tns tnt tra trc trd tre trg trn trr trs trt tsa tsc tsd tse tsg tsn tsr tss tst tta ttc ttd tte ttg ttn ttr tts ttt