-er a-a a-c a-t aaa aac aae aag aan aao aar aas aat ac- aca acc ace acg acn aco acr acs act aea aec aee aeg aen aeo aer aes aet ag- aga agc age agg agn ago agr ags agt an- ana anc ane ang ann ano anr ans ant aoa aoc aoe aog aon aoo aor aos aot ar- ara arc are arg arn aro arr ars art as- asa asc ase asg asn aso asr ass ast at- ata atc ate atg atn ato atr ats att c-- caa cac cae cag can cao car cas cat cca ccc cce ccg ccn cco ccr ccs cct ce- cea cec cee ceg cen ceo cer ces cet cga cgc cge cgg cgn cgo cgr cgs cgt cn- cna cnc cne cng cnn cno cnr cns cnt co- coa coc coe cog con coo cor cos cot cra crc cre crg crn cro crr crs crt csa csc cse csg csn cso csr css cst cta ctc cte ctg ctn cto ctr cts ctt eaa eac eae eag ean eao ear eas eat ec- eca ecc ece ecg ecn eco ecr ecs ect eea eec eee eeg een eeo eer ees eet ega egc ege egg egn ego egr egs egt en- ena enc ene eng enn eno enr ens ent eo- eoa eoc eoe eog eon eoo eor eos eot era erc ere erg ern ero err ers ert es- esa esc ese esg esn eso esr ess est eta etc ete etg etn eto etr ets ett gaa gac gae gag gan gao gar gas gat gca gcc gce gcg gcn gco gcr gcs gct ge- gea gec gee geg gen geo ger ges get gga ggc ggg ggn ggo ggr ggs ggt gna gnc gne gnn gno gnr gns gnt goa goc goe gog gon goo gor gos got gra grc gre grg grn gro grr grs grt gsa gsc gse gsg gsn gso gsr gss gst gta gtc gte gtg gtn gto gtr gts gtt naa nac nae nag nan nao nar nas nat nca ncc nce ncg ncn nco ncr ncs nct ne- nea nec nee neg nen neo ner nes net nga ngc nge ngg ngn ngo ngs ngt nna nnc nne nng nnn nno nns nnt no- noa noc noe nog non noo nor nos not nra nrc nre nrg nrn nro nrr nrs nrt nsa nsc nse nsg nsn nso nsr nss nst nta ntc nte ntg ntn nto ntr nts ntt oaa oac oae oag oan oao oar oas oat oc- oca occ ocg ocn oco ocr ocs oct oea oec oee oeg oen oeo oer oes oet oga ogc oge ogg ogn ogo ogs ogt on- ona onc one ong onn ono onr ons ont oo- ooa ooc oog oon ooo oor oos oot or- ora orc ore org orn oro orr ors ort os- osa osc ose osg osn oso osr oss ost ot- ota otc ote otg otn oto otr ots ott ra- raa rac rae rag ran rao rar ras rat rca rcc rce rcg rcn rco rcr rcs rct re- rea rec ree reg ren reo rer res ret rga rgc rge rgg rgn rgo rgr rgs rgt rna rnc rng rnn rno rnr rns rnt roa roc roe rog ron roo ror ros rot rra rrc rrg rrn rrr rrs rrt rsa rsc rse rsg rsn rso rsr rss rst rta rtc rte rtg rtn rto rtr rts rtt saa sac sae sag san sao sar sas sat sca scc sce scg scn sco scr scs sct se- sea sec see seg sen seo ser ses set sga sgc sge sgg sgn sgo sgr sgs sgt sna snc sne sng snn sno snr sns snt soa soc soe sog son soo sor sos sot sr- sra src sre srg srn sro srr srs srt ss- ssa ssc sse ssg ssn sso ssr sss sst sta stc ste stg stn sto str sts stt taa tac tae tag tan tao tar tas tat tca tcc tce tcg tcn tco tcr tcs tct te- tea tec tee teg ten teo ter tes tet tga tgc tge tgg tgn tgo tgr tgs tgt tna tnc tne tng tnn tno tnr tns tnt to- toa toc toe tog ton too tor tos tot tra trc tre trg trn tro trr trs trt tsa tsc tse tsg tsn tso tsr tss tst tta ttc tte ttg ttn tto ttr tts ttt