-er -ic c-- ccc cce ccg cci ccr ccs ce- cec cee ceg cei cer ces cgc cge cgg cgi cgr cgs ci- cic cie cig cii cir cis crc cre crg cri crr crs csc cse csg csi csr css ec- ecc ece ecg eci ecr ecs eec eee eeg eer ees egc ege egg egi egr egs eic eie eig eii eir eis erc ere erg eri err ers es- esc ese esg esi esr ess gcc gce gcg gci gcr gcs ge- gec gee geg gei ger ges ggc ggg ggi ggr ggs gic gie gig gii gir gis grc gre grg gri grr grs gsc gse gsg gsi gsr gss icc ice icg ici icr ics ie- iec iee ieg iei ier ies igc ige igg igi igr igs iic iie iii iir iis ir- irc ire irg iri irr irs is- isc ise isg isi isr iss rcc rce rcg rci rcr rcs re- rec ree reg rei rer res rgc rge rgg rgi rgr rgs ric rie rig rii rir ris rrc rrg rri rrr rrs rsc rse rsg rsi rsr rss scc sce scg sci scr scs se- sec see seg sei ser ses sgc sge sgg sgi sgr sgs sic sie sig sii sir sis sr- src sre srg sri srr srs ss- ssc sse ssg ssi ssr sss