-er a-a a-c aaa aac aae aag aam aao aar aas ac- aca acc ace acg acm aco acr acs aea aec aee aeg aem aeo aer aes ag- aga agc age agg agm ago agr ags ama amc ame amg amm amo amr ams aoa aoc aoe aog aom aoo aor aos ar- ara arc are arg arm aro arr ars as- asa asc ase asg asm aso asr ass c-- caa cac cae cag cam cao car cas cca ccc cce ccg ccm cco ccr ccs ce- cea cec cee ceg cem ceo cer ces cga cgc cge cgg cgm cgo cgr cgs cma cmc cme cmg cmm cmo cmr cms co- coa coc coe cog com coo cor cos cra crc cre crg crm cro crr crs csa csc cse csg csm cso csr css eaa eac eae eag eam eao ear eas ec- eca ecc ece ecg ecm eco ecr ecs eea eec eee eeg eem eeo eer ees ega egc ege egg egm ego egr egs em- ema emc eme emg emm emo emr ems eo- eoa eoc eoe eog eom eoo eor eos era erc ere erg erm ero err ers es- esa esc ese esg esm eso esr ess gaa gac gae gag gam gao gar gas gca gcc gce gcg gcm gco gcr gcs ge- gea gec gee geg gem geo ger ges gga ggc ggg ggm ggo ggr ggs gma gmc gme gmg gmm gmo gmr gms goa goc goe gog gom goo gor gos gra grc gre grg grm gro grr grs gsa gsc gse gsg gsm gso gsr gss m-o m-r maa mac mae mag mam mao mar mas mc- mca mcc mce mcg mcm mco mcr mcs mea mec mee meg mem meo mer mes mga mgc mge mgm mgo mgr mgs mma mmc mme mmg mmm mmo mmr mms moa moc moe mog mom moo mor mos mra mrc mre mrg mrm mro mrr mrs msa msc mse msg msm mso msr mss oaa oac oae oag oam oao oar oas oc- oca occ ocg ocm oco ocr ocs oea oec oee oeg oem oeo oer oes oga ogc oge ogg ogo ogs om- oma omc ome omg omm omo omr oms oo- ooa ooc oog oom ooo oor oos or- ora orc ore org orm oro orr ors os- osa osc ose osg osm oso osr oss ra- raa rac rae rag ram rao rar ras rca rcc rce rcg rcm rco rcr rcs re- rea rec ree reg rem reo rer res rga rgc rge rgg rgo rgr rgs rma rmc rme rmg rmm rmo rmr rms roa roc roe rog rom roo ror ros rra rrc rrg rrm rrr rrs rsa rsc rse rsg rsm rso rsr rss saa sac sae sag sam sao sar sas sca scc sce scg scm sco scr scs se- sea sec see seg sem seo ser ses sga sgc sge sgg sgm sgo sgr sgs sma smc sme smg smm smo smr sms soa soc soe sog som soo sor sos sr- sra src sre srg srm sro srr srs ss- ssa ssc sse ssg ssm sso ssr sss