-er a-a a-c a-t aaa aac aae aag aak aan aar aas aat ac- aca acc ace acg ack acn acr acs act aea aec aee aeg aek aen aer aes aet ag- aga agc age agg agk agn agr ags agt aka akc ake akg akk akn akr aks an- ana anc ane ang ank ann anr ans ant ar- ara arc are arg ark arn arr ars art as- asa asc ase asg ask asn asr ass ast at- ata atc ate atg atn atr ats att c-- caa cac cae cag cak can car cas cat cca ccc cce ccg cck ccn ccr ccs cct ce- cea cec cee ceg cek cen cer ces cet cga cgc cge cgg cgn cgr cgs cgt cka ckc cks ckt cn- cna cnc cne cng cnn cnr cns cnt cra crc cre crg crk crn crr crs crt csa csc cse csg csk csn csr css cst cta ctc cte ctg ctk ctn ctr cts ctt eaa eac eae eag eak ean ear eas eat ec- eca ecc ece ecg eck ecn ecr ecs ect eea eec eee eeg eek een eer ees eet ega egc ege egg egn egr egs egt eka ekc eke ekg ekr eks ekt en- ena enc ene eng enk enn enr ens ent era erc ere erg erk ern err ers ert es- esa esc ese esg esk esn esr ess est eta etc ete etg etk etn etr ets ett gaa gac gae gag gak gan gar gas gat gca gcc gce gcg gck gcn gcr gcs gct ge- gea gec gee geg gek gen ger ges get gga ggc ggg ggn ggr ggs ggt gka gkn gks gkt gna gnc gne gnn gnr gns gnt gra grc gre grg grk grn grr grs grt gsa gsc gse gsg gsk gsn gsr gss gst gta gtc gte gtg gtk gtn gtr gts gtt k-t ka- kaa kac kae kag kak kan kar kas kat kca kcc kce kcg kck kcn kcr kcs kct ke- kea kec kee keg kek ken ker kes ket kga kgc kgs kkc kke kkk kkn kkr kks kkt kn- kna knc kne kng knk knn knr knt kra krc krg krk krn krr krs krt ksa ksc kse ksg ksk ksn ksr kss kst kta ktc kte ktg ktk ktn ktr kts ktt naa nac nae nag nak nan nar nas nat nca ncc nce ncg nck ncn ncr ncs nct ne- nea nec nee neg nek nen ner nes net nga ngc nge ngg ngk ngn ngs ngt nka nkc nke nkk nkn nkr nks nkt nna nnc nne nng nnk nnn nns nnt nra nrc nre nrg nrk nrn nrr nrs nrt nsa nsc nse nsg nsk nsn nsr nss nst nta ntc nte ntg ntk ntn ntr nts ntt ra- raa rac rae rag rak ran rar ras rat rca rcc rce rcg rcn rcr rcs rct re- rea rec ree reg rek ren rer res ret rga rgc rge rgg rgk rgn rgr rgs rgt rkc rke rkg rkk rks rkt rna rnc rng rnn rnr rns rnt rra rrc rrg rrk rrn rrr rrs rrt rsa rsc rse rsg rsk rsn rsr rss rst rta rtc rte rtg rtk rtn rtr rts rtt saa sac sae sag sak san sar sas sat sca scc sce scg sck scn scr scs sct se- sea sec see seg sek sen ser ses set sga sgc sge sgg sgk sgn sgr sgs sgt sk- ska skc ske skg skk skr sks skt sna snc sne sng snk snn snr sns snt sr- sra src sre srg srk srn srr srs srt ss- ssa ssc sse ssg ssk ssn ssr sss sst sta stc ste stg stk stn str sts stt taa tac tae tag tak tan tar tas tat tca tcc tce tcg tck tcn tcr tcs tct te- tea tec tee teg tek ten ter tes tet tga tgc tge tgg tgk tgn tgr tgs tgt tka tkc tke tkg tkk tkr tks tkt tna tnc tne tng tnk tnn tnr tns tnt tra trc tre trg trk trn trr trs trt tsa tsc tse tsg tsk tsn tsr tss tst tta ttc tte ttg ttk ttn ttr tts ttt