-er a-a a-c aaa aac aae aag aan aar aas ac- aca acc ace acg acn acr acs aea aec aee aeg aen aer aes ag- aga agc age agg agn agr ags an- ana anc ane ang ann anr ans ar- ara arc are arg arn arr ars as- asa asc ase asg asn asr ass c-- caa cac cae cag can car cas cca ccc cce ccg ccn ccr ccs ce- cea cec cee ceg cen cer ces cga cgc cge cgg cgn cgr cgs cn- cna cnc cne cng cnn cnr cns cra crc cre crg crn crr crs csa csc cse csg csn csr css eaa eac eae eag ean ear eas ec- eca ecc ece ecg ecn ecr ecs eea eec eee eeg een eer ees ega egc ege egg egn egr egs en- ena enc ene eng enn enr ens era erc ere erg ern err ers es- esa esc ese esg esn esr ess gaa gac gae gag gan gar gas gca gcc gce gcg gcn gcr gcs ge- gea gec gee geg gen ger ges gga ggc ggg ggn ggr ggs gna gnc gne gnn gnr gns gra grc gre grg grn grr grs gsa gsc gse gsg gsn gsr gss naa nac nae nag nan nar nas nca ncc nce ncg ncn ncr ncs ne- nea nec nee neg nen ner nes nga ngc nge ngg ngn ngs nna nnc nne nng nnn nns nra nrc nre nrg nrn nrr nrs nsa nsc nse nsg nsn nsr nss ra- raa rac rae rag ran rar ras rca rcc rce rcg rcn rcr rcs re- rea rec ree reg ren rer res rga rgc rge rgg rgn rgr rgs rna rnc rng rnn rnr rns rra rrc rrg rrn rrr rrs rsa rsc rse rsg rsn rsr rss saa sac sae sag san sar sas sca scc sce scg scn scr scs se- sea sec see seg sen ser ses sga sgc sge sgg sgn sgr sgs sna snc sne sng snn snr sns sr- sra src sre srg srn srr srs ss- ssa ssc sse ssg ssn ssr sss