-er a-a a-c aaa aac aae aag aam aar aas ac- aca acc ace acg acm acr acs aea aec aee aeg aem aer aes ag- aga agc age agg agm agr ags ama amc ame amg amm amr ams ar- ara arc are arg arm arr ars as- asa asc ase asg asm asr ass c-- caa cac cae cag cam car cas cca ccc cce ccg ccm ccr ccs ce- cea cec cee ceg cem cer ces cga cgc cge cgg cgm cgr cgs cma cmc cme cmg cmm cmr cms cra crc cre crg crm crr crs csa csc cse csg csm csr css eaa eac eae eag eam ear eas ec- eca ecc ece ecg ecm ecr ecs eea eec eee eeg eem eer ees ega egc ege egg egm egr egs em- ema emc eme emg emm emr ems era erc ere erg erm err ers es- esa esc ese esg esm esr ess gaa gac gae gag gam gar gas gca gcc gce gcg gcm gcr gcs ge- gea gec gee geg gem ger ges gga ggc ggg ggm ggr ggs gma gmc gme gmg gmm gmr gms gra grc gre grg grm grr grs gsa gsc gse gsg gsm gsr gss m-r maa mac mae mag mam mar mas mc- mca mcc mce mcg mcm mcr mcs mea mec mee meg mem mer mes mga mgc mge mgm mgr mgs mma mmc mme mmg mmm mmr mms mra mrc mre mrg mrm mrr mrs msa msc mse msg msm msr mss ra- raa rac rae rag ram rar ras rca rcc rce rcg rcm rcr rcs re- rea rec ree reg rem rer res rga rgc rge rgg rgr rgs rma rmc rme rmg rmm rmr rms rra rrc rrg rrm rrr rrs rsa rsc rse rsg rsm rsr rss saa sac sae sag sam sar sas sca scc sce scg scm scr scs se- sea sec see seg sem ser ses sga sgc sge sgg sgm sgr sgs sma smc sme smg smm smr sms sr- sra src sre srg srm srr srs ss- ssa ssc sse ssg ssm ssr sss