-er a-a a-c aaa aac aae aag aah aar aas ac- aca acc ace acg ach acr acs aea aec aee aeg aeh aer aes ag- aga agc age agg agh agr ags aha ahc ahe ahg ahh ahr ahs ar- ara arc are arg arh arr ars as- asa asc ase asg ash asr ass c-- caa cac cae cag cah car cas cca ccc cce ccg cch ccr ccs ce- cea cec cee ceg ceh cer ces cga cgc cge cgg cgh cgr cgs ch- cha chc che chg chh chr chs cra crc cre crg crh crr crs csa csc cse csg csh csr css eaa eac eae eag eah ear eas ec- eca ecc ece ecg ech ecr ecs eea eec eee eeg eer ees ega egc ege egg egh egr egs eha ehc ehe ehg ehh ehr ehs era erc ere erg erh err ers es- esa esc ese esg esh esr ess gaa gac gae gag gah gar gas gca gcc gce gcg gch gcr gcs ge- gea gec gee geg geh ger ges gga ggc ggg ggh ggr ggs gha ghc ghe ghg ghh ghr ghs gra grc gre grg grh grr grs gsa gsc gse gsg gsr gss haa hac hae hag hah har has hca hcc hce hcg hch hcr hcs he- hea hec hee heg heh her hes hga hgc hge hgg hgh hgr hgs hha hhc hhe hhg hhh hhr hhs hr- hra hrc hre hrg hrh hrr hrs hsa hsc hse hsg hsh hsr hss ra- raa rac rae rag rah rar ras rca rcc rce rcg rch rcr rcs re- rea rec ree reg reh rer res rga rgc rge rgg rgh rgr rgs rh- rha rhc rhe rhg rhh rhr rhs rra rrc rrg rrh rrr rrs rsa rsc rse rsg rsh rsr rss saa sac sae sag sah sar sas sca scc sce scg sch scr scs se- sea sec see seg seh ser ses sga sgc sge sgg sgh sgr sgs sh- sha shc she shg shh shr shs sr- sra src sre srg srh srr srs ss- ssa ssc sse ssg ssh ssr sss