-er a-a a-c a-t aaa aac aae aag aao aap aar aas aat ac- aca acc ace acg aco acp acr acs act aea aec aee aeg aeo aep aer aes aet ag- aga agc age agg ago agp agr ags agt aoa aoc aoe aog aoo aop aor aos aot ap- apa apc ape apg apo app apr aps apt ar- ara arc are arg aro arp arr ars art as- asa asc ase asg aso asp asr ass ast at- ata atc ate atg ato atp atr ats att c-- caa cac cae cag cao cap car cas cat cca ccc cce ccg cco ccp ccr ccs cct ce- cea cec cee ceg ceo cep cer ces cet cga cgc cge cgg cgo cgp cgr cgs cgt co- coa coc coe cog coo cop cor cos cot cpa cpc cpe cpg cpo cpp cpr cps cpt cra crc cre crg cro crp crr crs crt csa csc cse csg cso csp csr css cst cta ctc cte ctg cto ctp ctr cts ctt eaa eac eae eag eao eap ear eas eat ec- eca ecc ece ecg eco ecr ecs ect eea eec eee eeg eeo eep eer ees eet ega egc ege egg ego egp egr egs egt eo- eoa eoc eoe eog eoo eop eor eos eot ep- epa epc epe epg epo epp epr eps ept era erc ere erg ero erp err ers ert es- esa esc ese esg eso esp esr ess est eta etc ete etg eto etp etr ets ett g-p gaa gac gae gag gao gap gar gas gat gca gcc gce gcg gco gcp gcr gcs gct ge- gea gec gee geg geo gep ger ges get gga ggc ggg ggo ggp ggr ggs ggt goa goc goe gog goo gop gor gos got gpa gpc gpe gpg gpo gpp gpr gps gpt gra grc gre grg gro grp grr grs grt gsa gsc gse gsg gso gsp gsr gss gst gta gtc gte gtg gto gtp gtr gts gtt oaa oac oae oag oao oap oar oas oat oc- oca occ ocg oco ocp ocr ocs oct oea oec oee oeg oeo oep oer oes oet oga ogc oge ogg ogo ogp ogs ogt oo- ooa ooc oog ooo oop oor oos oot op- opa opc ope opg opo opp opr ops opt or- ora orc ore org oro orp orr ors ort os- osa osc ose osg oso osp osr oss ost ot- ota otc ote otg oto otp otr ots ott p-p paa pac pae pag pao pap par pas pat pca pcc pce pcg pco pcp pcr pcs pct pea pec pee peg peo pep per pes pet pga pgc pge pgg pgo pgp pgr pgs pgt poa poc poe pog poo pop por pos pot ppa ppc ppe ppg ppo ppp ppr pps ppt pra prc pre prg pro prp prr prs prt ps- psa psc pse psg pso psp psr pss pst pt- pta ptc pte ptg pto ptp ptr pts ptt ra- raa rac rae rag rao rap rar ras rat rca rcc rce rcg rco rcp rcr rcs rct re- rea rec ree reg reo rep rer res ret rga rgc rge rgg rgo rgp rgr rgs rgt roa roc roe rog roo rop ror ros rot rpa rpc rpe rpg rpo rpp rpr rps rpt rra rrc rrg rrp rrr rrs rrt rsa rsc rse rsg rso rsp rsr rss rst rta rtc rte rtg rto rtp rtr rts rtt saa sac sae sag sao sap sar sas sat sca scc sce scg sco scp scr scs sct se- sea sec see seg seo sep ser ses set sga sgc sge sgg sgo sgp sgr sgs sgt soa soc soe sog soo sop sor sos sot spa spc spe spg spo spp spr sps spt sr- sra src sre srg sro srp srr srs srt ss- ssa ssc sse ssg sso ssp ssr sss sst sta stc ste stg sto stp str sts stt taa tac tae tag tao tap tar tas tat tca tcc tce tcg tco tcp tcr tcs tct te- tea tec tee teg teo tep ter tes tet tga tgc tge tgg tgo tgp tgr tgs tgt to- toa toc toe tog too top tor tos tot tpa tpc tpe tpg tpo tpp tpr tps tpt tra trc tre trg tro trp trr trs trt tsa tsc tse tsg tso tsp tsr tss tst tta ttc tte ttg tto ttp ttr tts ttt