-er c-- ccc cce ccg ccr ccs ce- cec cee ceg cer ces cgc cge cgg cgr cgs crc cre crg crr crs csc cse csg csr css ec- ecc ece ecg ecr ecs eec eee eeg eer ees egc ege egg egr egs erc ere erg err ers es- esc ese esg esr ess gcc gce gcg gcr gcs ge- gec gee geg ger ges ggc ggg ggr ggs grc gre grg grr grs gsc gse gsg gsr gss rcc rce rcg rcr rcs re- rec ree reg rer res rgc rge rgg rgr rgs rrc rrg rrr rrs rsc rse rsg rsr rss scc sce scg scr scs se- sec see seg ser ses sgc sge sgg sgr sgs sr- src sre srg srr srs ss- ssc sse ssg ssr sss