-er c-- ccc cce ccg cco ccr ccs cct ccv ce- cec cee ceg ceo cer ces cet cev cgc cge cgg cgo cgr cgs cgt cgv co- coc coe cog coo cor cos cot cov crc cre crg cro crr crs crt crv csc cse csg cso csr css cst csv ctc cte ctg cto ctr cts ctt ctv cvc cve cvg cvo cvr cvs cvt cvv ec- ecc ece ecg eco ecr ecs ect ecv eec eee eeg eeo eer ees eet eev egc ege egg ego egr egs egt eo- eoc eoe eog eoo eor eos eot erc ere erg ero err ers ert erv es- esc ese esg eso esr ess est esv etc ete etg eto etr ets ett etv evc eve evg evo evr evs evt evv gcc gce gcg gco gcr gcs gct ge- gec gee geg geo ger ges get gev ggc ggg ggo ggr ggs ggt ggv goc goe gog goo gor gos got gov grc gre grg gro grr grs grt grv gsc gse gsg gso gsr gss gst gsv gtc gte gtg gto gtr gts gtt gtv gvc gve gvg gvo gvr gvs gvt oc- occ ocg oco ocr ocs oct ocv oec oee oeg oeo oer oes oet ogc oge ogg ogo ogs ogt oo- ooc oog ooo oor oos oot oov or- orc ore org oro orr ors ort orv os- osc ose osg oso osr oss ost osv ot- otc ote otg oto otr ots ott otv ov- ovc ove ovo ovs ovv rcc rce rcg rco rcr rcs rct rcv re- rec ree reg reo rer res ret rev rgc rge rgg rgo rgr rgs rgt rgv roc roe rog roo ror ros rot rov rrc rrg rrr rrs rrt rsc rse rsg rso rsr rss rst rsv rtc rte rtg rto rtr rts rtt rtv rvc rve rvg rvo rvr rvs rvt rvv scc sce scg sco scr scs sct scv se- sec see seg seo ser ses set sev sgc sge sgg sgo sgr sgs sgt sgv soc soe sog soo sor sos sot sov sr- src sre srg sro srr srs srt srv ss- ssc sse ssg sso ssr sss sst ssv stc ste stg sto str sts stt stv svc sve svg svo svr svs svt svv tcc tce tcg tco tcr tcs tct tcv te- tec tee teg teo ter tes tet tev tgc tge tgg tgo tgr tgs tgt tgv to- toc toe tog too tor tos tot tov trc tre trg tro trr trs trt trv tsc tse tsg tso tsr tss tst tsv ttc tte ttg tto ttr tts ttt ttv tvc tve tvg tvo tvr tvs tvt v-e vcc vce vco vcr vcs vct vec vee veg veo ver ves vet vgc vgg vgo vgr vgs vgt voc voe vog voo vor vos vot vov vrc vre vrg vrr vrs vrt vsc vse vsg vso vsr vss vst vsv vtc vte vtg vto vtr vts vtt vtv vvc vvg vvo vvr vvs vvt vvv