-er a-a a-c aaa aac aae aag aan aao aar aas ac- aca acc ace acg acn aco acr acs aea aec aee aeg aen aeo aer aes ag- aga agc age agg agn ago agr ags an- ana anc ane ang ann ano anr ans aoa aoc aoe aog aon aoo aor aos ar- ara arc are arg arn aro arr ars as- asa asc ase asg asn aso asr ass c-- caa cac cae cag can cao car cas cca ccc cce ccg ccn cco ccr ccs ce- cea cec cee ceg cen ceo cer ces cga cgc cge cgg cgn cgo cgr cgs cn- cna cnc cne cng cnn cno cnr cns co- coa coc coe cog con coo cor cos cra crc cre crg crn cro crr crs csa csc cse csg csn cso csr css eaa eac eae eag ean eao ear eas ec- eca ecc ece ecg ecn eco ecr ecs eea eec eee eeg een eeo eer ees ega egc ege egg egn ego egr egs en- ena enc ene eng enn eno enr ens eo- eoa eoc eoe eog eon eoo eor eos era erc ere erg ern ero err ers es- esa esc ese esg esn eso esr ess gaa gac gae gag gan gao gar gas gca gcc gce gcg gcn gco gcr gcs ge- gea gec gee geg gen geo ger ges gga ggc ggg ggn ggo ggr ggs gna gnc gne gnn gno gnr gns goa goc goe gog gon goo gor gos gra grc gre grg grn gro grr grs gsa gsc gse gsg gsn gso gsr gss naa nac nae nag nan nao nar nas nca ncc nce ncg ncn nco ncr ncs ne- nea nec nee neg nen neo ner nes nga ngc nge ngg ngn ngo ngs nna nnc nne nng nnn nno nns no- noa noc noe nog non noo nor nos nra nrc nre nrg nrn nro nrr nrs nsa nsc nse nsg nsn nso nsr nss oaa oac oae oag oan oao oar oas oc- oca occ ocg ocn oco ocr ocs oea oec oee oeg oen oeo oer oes oga ogc oge ogg ogn ogo ogs on- ona onc one ong onn ono onr ons oo- ooa ooc oog oon ooo oor oos or- ora orc ore org orn oro orr ors os- osa osc ose osg osn oso osr oss ra- raa rac rae rag ran rao rar ras rca rcc rce rcg rcn rco rcr rcs re- rea rec ree reg ren reo rer res rga rgc rge rgg rgn rgo rgr rgs rna rnc rng rnn rno rnr rns roa roc roe rog ron roo ror ros rra rrc rrg rrn rrr rrs rsa rsc rse rsg rsn rso rsr rss saa sac sae sag san sao sar sas sca scc sce scg scn sco scr scs se- sea sec see seg sen seo ser ses sga sgc sge sgg sgn sgo sgr sgs sna snc sne sng snn sno snr sns soa soc soe sog son soo sor sos sr- sra src sre srg srn sro srr srs ss- ssa ssc sse ssg ssn sso ssr sss