-er c-- ccc cce ccg cco ccr ccs ccv ce- cec cee ceg ceo cer ces cev cgc cge cgg cgo cgr cgs cgv co- coc coe cog coo cor cos cov crc cre crg cro crr crs crv csc cse csg cso csr css csv cvc cve cvg cvo cvr cvs cvv ec- ecc ece ecg eco ecr ecs ecv eec eee eeg eeo eer ees eev egc ege egg ego egr egs eo- eoc eoe eog eoo eor eos erc ere erg ero err ers erv es- esc ese esg eso esr ess esv evc eve evg evo evr evs evv gcc gce gcg gco gcr gcs ge- gec gee geg geo ger ges gev ggc ggg ggo ggr ggs ggv goc goe gog goo gor gos gov grc gre grg gro grr grs grv gsc gse gsg gso gsr gss gsv gvc gve gvg gvo gvr gvs oc- occ ocg oco ocr ocs ocv oec oee oeg oeo oer oes ogc oge ogg ogo ogs oo- ooc oog ooo oor oos oov or- orc ore org oro orr ors orv os- osc ose osg oso osr oss osv ov- ovc ove ovo ovs ovv rcc rce rcg rco rcr rcs rcv re- rec ree reg reo rer res rev rgc rge rgg rgo rgr rgs rgv roc roe rog roo ror ros rov rrc rrg rrr rrs rsc rse rsg rso rsr rss rsv rvc rve rvg rvo rvr rvs rvv scc sce scg sco scr scs scv se- sec see seg seo ser ses sev sgc sge sgg sgo sgr sgs sgv soc soe sog soo sor sos sov sr- src sre srg sro srr srs srv ss- ssc sse ssg sso ssr sss ssv svc sve svg svo svr svs svv v-e vcc vce vco vcr vcs vec vee veg veo ver ves vgc vgg vgo vgr vgs voc voe vog voo vor vos vov vrc vre vrg vrr vrs vsc vse vsg vso vsr vss vsv vvc vvg vvo vvr vvs vvv