-er a-a a-c aaa aac aae aag aah aao aar aas ac- aca acc ace acg ach aco acr acs aea aec aee aeg aeh aeo aer aes ag- aga agc age agg agh ago agr ags aha ahc ahe ahg ahh aho ahr ahs aoa aoc aoe aog aoh aoo aor aos ar- ara arc are arg arh aro arr ars as- asa asc ase asg ash aso asr ass c-- caa cac cae cag cah cao car cas cca ccc cce ccg cch cco ccr ccs ce- cea cec cee ceg ceh ceo cer ces cga cgc cge cgg cgh cgo cgr cgs ch- cha chc che chg chh cho chr chs co- coa coc coe cog coh coo cor cos cra crc cre crg crh cro crr crs csa csc cse csg csh cso csr css eaa eac eae eag eah eao ear eas ec- eca ecc ece ecg ech eco ecr ecs eea eec eee eeg eeo eer ees ega egc ege egg egh ego egr egs eha ehc ehe ehg ehh eho ehr ehs eo- eoa eoc eoe eog eoh eoo eor eos era erc ere erg erh ero err ers es- esa esc ese esg esh eso esr ess gaa gac gae gag gah gao gar gas gca gcc gce gcg gch gco gcr gcs ge- gea gec gee geg geh geo ger ges gga ggc ggg ggh ggo ggr ggs gha ghc ghe ghg ghh gho ghr ghs goa goc goe gog goh goo gor gos gra grc gre grg grh gro grr grs gsa gsc gse gsg gso gsr gss haa hac hae hag hah hao har has hca hcc hce hcg hch hco hcr hcs he- hea hec hee heg heh heo her hes hga hgc hge hgg hgh hgo hgr hgs hha hhc hhe hhg hhh hho hhr hhs hoa hoc hoe hog hoh hoo hor hos hr- hra hrc hre hrg hrh hro hrr hrs hsa hsc hse hsg hsh hsr hss oaa oac oae oag oah oao oar oas oc- oca occ ocg och oco ocr ocs oea oec oee oeg oeh oeo oer oes oga ogc oge ogg ogh ogo ogs oha ohc ohe ohg ohh oho ohr ohs oo- ooa ooc oog ooh ooo oor oos or- ora orc ore org orh oro orr ors os- osa osc ose osg osh oso osr oss ra- raa rac rae rag rah rao rar ras rca rcc rce rcg rch rco rcr rcs re- rea rec ree reg reh reo rer res rga rgc rge rgg rgh rgo rgr rgs rh- rha rhc rhe rhg rhh rho rhr rhs roa roc roe rog roh roo ror ros rra rrc rrg rrh rrr rrs rsa rsc rse rsg rsh rso rsr rss saa sac sae sag sah sao sar sas sca scc sce scg sch sco scr scs se- sea sec see seg seh seo ser ses sga sgc sge sgg sgh sgo sgr sgs sh- sha shc she shg shh sho shr shs soa soc soe sog soh soo sor sos sr- sra src sre srg srh sro srr srs ss- ssa ssc sse ssg ssh sso ssr sss