-er a-a a-c aaa aac aae aag aah aak aar aas ac- aca acc ace acg ach ack acr acs aea aec aee aeg aeh aek aer aes ag- aga agc age agg agh agk agr ags aha ahc ahe ahg ahh ahk ahr ahs aka akc ake akg akh akk akr aks ar- ara arc are arg arh ark arr ars as- asa asc ase asg ash ask asr ass c-- caa cac cae cag cah cak car cas cca ccc cce ccg cch cck ccr ccs ce- cea cec cee ceg ceh cek cer ces cga cgc cge cgg cgh cgr cgs ch- cha chc che chg chh chk chr chs cka ckc ckh cks cra crc cre crg crh crk crr crs csa csc cse csg csh csk csr css eaa eac eae eag eah eak ear eas ec- eca ecc ece ecg ech eck ecr ecs eea eec eee eeg eek eer ees ega egc ege egg egh egr egs eha ehc ehe ehg ehh ehr ehs eka ekc eke ekg ekh ekr eks era erc ere erg erh erk err ers es- esa esc ese esg esh esk esr ess gaa gac gae gag gah gak gar gas gca gcc gce gcg gch gck gcr gcs ge- gea gec gee geg geh gek ger ges gga ggc ggg ggh ggr ggs gha ghc ghe ghg ghh ghr ghs gka gkh gks gra grc gre grg grh grk grr grs gsa gsc gse gsg gsk gsr gss haa hac hae hag hah hak har has hca hcc hce hcg hch hck hcr hcs he- hea hec hee heg heh hek her hes hga hgc hge hgg hgh hgk hgr hgs hha hhc hhe hhg hhh hhk hhr hhs hka hkg hkh hkk hkr hks hr- hra hrc hre hrg hrh hrk hrr hrs hsa hsc hse hsg hsh hsk hsr hss ka- kaa kac kae kag kah kak kar kas kca kcc kce kcg kch kck kcr kcs ke- kea kec kee keg keh kek ker kes kga kgc kgh kgs kha khe khh khk khr khs kkc kke kkh kkk kkr kks kra krc krg krk krr krs ksa ksc kse ksg ksh ksk ksr kss ra- raa rac rae rag rah rak rar ras rca rcc rce rcg rch rcr rcs re- rea rec ree reg reh rek rer res rga rgc rge rgg rgh rgk rgr rgs rh- rha rhc rhe rhg rhh rhr rhs rkc rke rkg rkk rks rra rrc rrg rrh rrk rrr rrs rsa rsc rse rsg rsh rsk rsr rss saa sac sae sag sah sak sar sas sca scc sce scg sch sck scr scs se- sea sec see seg seh sek ser ses sga sgc sge sgg sgh sgk sgr sgs sh- sha shc she shg shh shk shr shs sk- ska skc ske skg skh skk skr sks sr- sra src sre srg srh srk srr srs ss- ssa ssc sse ssg ssh ssk ssr sss