-er c-- ccc cce ccf ccg cco ccr ccs cct ce- cec cee cef ceg ceo cer ces cet cfc cfe cff cfg cfo cfr cfs cft cgc cge cgg cgo cgr cgs cgt co- coc coe cof cog coo cor cos cot crc cre crf crg cro crr crs crt csc cse csf csg cso csr css cst ctc cte ctf ctg cto ctr cts ctt ec- ecc ece ecf ecg eco ecr ecs ect eec eee eef eeg eeo eer ees eet ef- efc efe eff efg efo efr efs eft egc ege egf egg ego egr egs egt eo- eoc eoe eof eog eoo eor eos eot erc ere erf erg ero err ers ert es- esc ese esf esg eso esr ess est etc ete etf etg eto etr ets ett fcc fce fcf fcg fco fcr fcs fct fec fee fef feg feo fer fes fet ffc ffe fff ffg ffo ffr ffs fft fgc fge fgf fgg fgr fgs fgt foc foe fof fog foo for fos fot frc fre frf frg fro frr frs frt fsc fse fsf fsg fso fsr fss fst ftc fte ftf ftg fto ftr fts ftt gcc gce gcf gcg gco gcr gcs gct ge- gec gee gef geg geo ger ges get gfc gfe gff gfo gfr gfs gft ggc ggg ggo ggr ggs ggt goc goe gof gog goo gor gos got grc gre grf grg gro grr grs grt gsc gse gsf gsg gso gsr gss gst gtc gte gtf gtg gto gtr gts gtt oc- occ ocf ocg oco ocr ocs oct oec oee oef oeg oeo oer oes oet of- ofc ofe off ofg ofo ofr ofs oft ogc oge ogf ogg ogo ogs ogt oo- ooc oof oog ooo oor oos oot or- orc ore orf org oro orr ors ort os- osc ose osf osg oso osr oss ost ot- otc ote otf otg oto otr ots ott rcc rce rcf rcg rco rcr rcs rct re- rec ree ref reg reo rer res ret rfc rfe rff rfg rfo rfr rfs rft rgc rge rgf rgg rgo rgr rgs rgt roc roe rof rog roo ror ros rot rrc rrf rrg rrr rrs rrt rsc rse rsf rsg rso rsr rss rst rtc rte rtf rtg rto rtr rts rtt scc sce scf scg sco scr scs sct se- sec see sef seg seo ser ses set sfc sfe sff sfg sfo sfr sfs sft sgc sge sgf sgg sgo sgr sgs sgt soc soe sof sog soo sor sos sot sr- src sre srf srg sro srr srs srt ss- ssc sse ssf ssg sso ssr sss sst stc ste stf stg sto str sts stt tcc tce tcf tcg tco tcr tcs tct te- tec tee tef teg teo ter tes tet tfc tfe tff tfg tfo tfr tfs tft tgc tge tgf tgg tgo tgr tgs tgt to- toc toe tof tog too tor tos tot trc tre trf trg tro trr trs trt tsc tse tsf tsg tso tsr tss tst ttc tte ttf ttg tto ttr tts ttt