-er -ic c-- ccc cce ccg cci cco ccr ccs ce- cec cee ceg cei ceo cer ces cgc cge cgg cgi cgo cgr cgs ci- cic cie cig cii cio cir cis co- coc coe cog coi coo cor cos crc cre crg cri cro crr crs csc cse csg csi cso csr css ec- ecc ece ecg eci eco ecr ecs eec eee eeg eeo eer ees egc ege egg egi ego egr egs eic eie eig eii eio eir eis eo- eoc eoe eog eoi eoo eor eos erc ere erg eri ero err ers es- esc ese esg esi eso esr ess gcc gce gcg gci gco gcr gcs ge- gec gee geg gei geo ger ges ggc ggg ggi ggo ggr ggs gic gie gig gii gio gir gis goc goe gog goi goo gor gos grc gre grg gri gro grr grs gsc gse gsg gsi gso gsr gss icc ice icg ici ico icr ics ie- iec iee ieg iei ier ies igc ige igg igi igo igr igs iic iie iii iio iir iis io- ioc ioe iog ioi ioo ior ios ir- irc ire irg iri iro irr irs is- isc ise isg isi iso isr iss o-i oc- occ ocg oci oco ocr ocs oec oee oeg oei oeo oer oes ogc oge ogg ogi ogo ogs oic oie oii oio oir ois oo- ooc oog ooi ooo oor oos or- orc ore org ori oro orr ors os- osc ose osg osi oso osr oss rcc rce rcg rci rco rcr rcs re- rec ree reg rei reo rer res rgc rge rgg rgi rgo rgr rgs ric rie rig rii rio rir ris roc roe rog roi roo ror ros rrc rrg rri rrr rrs rsc rse rsg rsi rso rsr rss scc sce scg sci sco scr scs se- sec see seg sei seo ser ses sgc sge sgg sgi sgo sgr sgs sic sie sig sii sio sir sis soc soe sog soi soo sor sos sr- src sre srg sri sro srr srs ss- ssc sse ssg ssi sso ssr sss