-er a-a a-c a-t aaa aac aae aag aak aan aao aar aas aat ac- aca acc ace acg ack acn aco acr acs act aea aec aee aeg aek aen aeo aer aes aet ag- aga agc age agg agk agn ago agr ags agt aka akc ake akg akk akn ako akr aks an- ana anc ane ang ank ann ano anr ans ant aoa aoc aoe aog aok aon aoo aor aos aot ar- ara arc are arg ark arn aro arr ars art as- asa asc ase asg ask asn aso asr ass ast at- ata atc ate atg atn ato atr ats att c-- caa cac cae cag cak can cao car cas cat cca ccc cce ccg cck ccn cco ccr ccs cct ce- cea cec cee ceg cek cen ceo cer ces cet cga cgc cge cgg cgn cgo cgr cgs cgt cka ckc cko cks ckt cn- cna cnc cne cng cnn cno cnr cns cnt co- coa coc coe cog cok con coo cor cos cot cra crc cre crg crk crn cro crr crs crt csa csc cse csg csk csn cso csr css cst cta ctc cte ctg ctk ctn cto ctr cts ctt eaa eac eae eag eak ean eao ear eas eat ec- eca ecc ece ecg eck ecn eco ecr ecs ect eea eec eee eeg eek een eeo eer ees eet ega egc ege egg egn ego egr egs egt eka ekc eke ekg eko ekr eks ekt en- ena enc ene eng enk enn eno enr ens ent eo- eoa eoc eoe eog eok eon eoo eor eos eot era erc ere erg erk ern ero err ers ert es- esa esc ese esg esk esn eso esr ess est eta etc ete etg etk etn eto etr ets ett gaa gac gae gag gak gan gao gar gas gat gca gcc gce gcg gck gcn gco gcr gcs gct ge- gea gec gee geg gek gen geo ger ges get gga ggc ggg ggn ggo ggr ggs ggt gka gkn gko gks gkt gna gnc gne gnn gno gnr gns gnt goa goc goe gog gok gon goo gor gos got gra grc gre grg grk grn gro grr grs grt gsa gsc gse gsg gsk gsn gso gsr gss gst gta gtc gte gtg gtk gtn gto gtr gts gtt k-t ka- kaa kac kae kag kak kan kao kar kas kat kca kcc kce kcg kck kcn kcr kcs kct ke- kea kec kee keg kek ken keo ker kes ket kga kgc kgo kgs kkc kke kkk kkn kkr kks kkt kn- kna knc kne kng knk knn kno knr knt koa koc koe kog kok kon koo kor kos kot kra krc krg krk krn kro krr krs krt ksa ksc kse ksg ksk ksn kso ksr kss kst kta ktc kte ktg ktk ktn kto ktr kts ktt naa nac nae nag nak nan nao nar nas nat nca ncc nce ncg nck ncn nco ncr ncs nct ne- nea nec nee neg nek nen neo ner nes net nga ngc nge ngg ngk ngn ngo ngs ngt nka nkc nke nkk nkn nko nkr nks nkt nna nnc nne nng nnk nnn nno nns nnt no- noa noc noe nog nok non noo nor nos not nra nrc nre nrg nrk nrn nro nrr nrs nrt nsa nsc nse nsg nsk nsn nso nsr nss nst nta ntc nte ntg ntk ntn nto ntr nts ntt oaa oac oae oag oak oan oao oar oas oat oc- oca occ ocg ock ocn oco ocr ocs oct oea oec oee oeg oen oeo oer oes oet oga ogc oge ogg ogn ogo ogs ogt oka okc oke okg okk oko okr oks on- ona onc one ong onk onn ono onr ons ont oo- ooa ooc oog ook oon ooo oor oos oot or- ora orc ore org ork orn oro orr ors ort os- osa osc ose osg osk osn oso osr oss ost ot- ota otc ote otg otk otn oto otr ots ott ra- raa rac rae rag rak ran rao rar ras rat rca rcc rce rcg rcn rco rcr rcs rct re- rea rec ree reg rek ren reo rer res ret rga rgc rge rgg rgk rgn rgo rgr rgs rgt rkc rke rkg rkk rko rks rkt rna rnc rng rnn rno rnr rns rnt roa roc roe rog rok ron roo ror ros rot rra rrc rrg rrk rrn rrr rrs rrt rsa rsc rse rsg rsk rsn rso rsr rss rst rta rtc rte rtg rtk rtn rto rtr rts rtt saa sac sae sag sak san sao sar sas sat sca scc sce scg sck scn sco scr scs sct se- sea sec see seg sek sen seo ser ses set sga sgc sge sgg sgk sgn sgo sgr sgs sgt sk- ska skc ske skg skk sko skr sks skt sna snc sne sng snk snn sno snr sns snt soa soc soe sog sok son soo sor sos sot sr- sra src sre srg srk srn sro srr srs srt ss- ssa ssc sse ssg ssk ssn sso ssr sss sst sta stc ste stg stk stn sto str sts stt taa tac tae tag tak tan tao tar tas tat tca tcc tce tcg tck tcn tco tcr tcs tct te- tea tec tee teg tek ten teo ter tes tet tga tgc tge tgg tgk tgn tgo tgr tgs tgt tka tkc tke tkg tkk tko tkr tks tkt tna tnc tne tng tnk tnn tno tnr tns tnt to- toa toc toe tog tok ton too tor tos tot tra trc tre trg trk trn tro trr trs trt tsa tsc tse tsg tsk tsn tso tsr tss tst tta ttc tte ttg ttk ttn tto ttr tts ttt