-er c-- ccc cce ccg cco ccr cct ccv ce- cec cee ceg ceo cer cet cev cgc cge cgg cgo cgr cgt cgv co- coc coe cog coo cor cot cov crc cre crg cro crr crt crv ctc cte ctg cto ctr ctt ctv cvc cve cvg cvo cvr cvt cvv ec- ecc ece ecg eco ecr ect ecv eec eee eeg eeo eer eet eev egc ege egg ego egr egt eo- eoc eoe eog eoo eor eot erc ere erg ero err ert erv etc ete etg eto etr ett etv evc eve evg evo evr evt evv gcc gce gcg gco gcr gct ge- gec gee geg geo ger get gev ggc ggg ggo ggr ggt ggv goc goe gog goo gor got gov grc gre grg gro grr grt grv gtc gte gtg gto gtr gtt gtv gvc gve gvg gvo gvr gvt oc- occ ocg oco ocr oct ocv oec oee oeg oeo oer oet ogc oge ogg ogo ogt oo- ooc oog ooo oor oot oov or- orc ore org oro orr ort orv ot- otc ote otg oto otr ott otv ov- ovc ove ovo ovv rcc rce rcg rco rcr rct rcv re- rec ree reg reo rer ret rev rgc rge rgg rgo rgr rgt rgv roc roe rog roo ror rot rov rrc rrg rrr rrt rtc rte rtg rto rtr rtt rtv rvc rve rvg rvo rvr rvt rvv tcc tce tcg tco tcr tct tcv te- tec tee teg teo ter tet tev tgc tge tgg tgo tgr tgt tgv to- toc toe tog too tor tot tov trc tre trg tro trr trt trv ttc tte ttg tto ttr ttt ttv tvc tve tvg tvo tvr tvt v-e vcc vce vco vcr vct vec vee veg veo ver vet vgc vgg vgo vgr vgt voc voe vog voo vor vot vov vrc vre vrg vrr vrt vtc vte vtg vto vtr vtt vtv vvc vvg vvo vvr vvt vvv