-er a-a a-c aaa aac aae aag aah aar ac- aca acc ace acg ach acr aea aec aee aeg aeh aer ag- aga agc age agg agh agr aha ahc ahe ahg ahh ahr ar- ara arc are arg arh arr c-- caa cac cae cag cah car cca ccc cce ccg cch ccr ce- cea cec cee ceg ceh cer cga cgc cge cgg cgh cgr ch- cha chc che chg chh chr cra crc cre crg crh crr eaa eac eae eag eah ear ec- eca ecc ece ecg ech ecr eea eec eee eeg eer ega egc ege egg egh egr eha ehc ehe ehg ehh ehr era erc ere erg erh err gaa gac gae gag gah gar gca gcc gce gcg gch gcr ge- gea gec gee geg geh ger gga ggc ggg ggh ggr gha ghc ghe ghg ghh ghr gra grc gre grg grh grr haa hac hae hag hah har hca hcc hce hcg hch hcr he- hea hec hee heg heh her hga hgc hge hgg hgh hgr hha hhc hhe hhg hhh hhr hr- hra hrc hre hrg hrh hrr ra- raa rac rae rag rah rar rca rcc rce rcg rch rcr re- rea rec ree reg reh rer rga rgc rge rgg rgh rgr rh- rha rhc rhe rhg rhh rhr rra rrc rrg rrh rrr