-er a-a a-c aaa aac aae aag aar ac- aca acc ace acg acr aea aec aee aeg aer ag- aga agc age agg agr ar- ara arc are arg arr c-- caa cac cae cag car cca ccc cce ccg ccr ce- cea cec cee ceg cer cga cgc cge cgg cgr cra crc cre crg crr eaa eac eae eag ear ec- eca ecc ece ecg ecr eea eec eee eeg eer ega egc ege egg egr era erc ere erg err gaa gac gae gag gar gca gcc gce gcg gcr ge- gea gec gee geg ger gga ggc ggg ggr gra grc gre grg grr ra- raa rac rae rag rar rca rcc rce rcg rcr re- rea rec ree reg rer rga rgc rge rgg rgr rra rrc rrg rrr