-er c-- ccc ccd cce ccg cco ccr ccs cdc cdd cde cdg cdo cdr cds ce- cec ced cee ceg ceo cer ces cgc cgd cge cgg cgo cgr cgs co- coc cod coe cog coo cor cos crc crd cre crg cro crr crs csc csd cse csg cso csr css dcc dcd dce dcg dco dcr dcs ddc ddd dde ddg ddo ddr dds de- dec ded dee deg deo der des dgc dgd dge dgg dgr dgs doc dod doe dog doo dor dos drc drd dre drg dro drr drs dsc dsd dse dsg dso dsr dss ec- ecc ecd ece ecg eco ecr ecs ed- edc edd ede edg edo edr eds eec eed eee eeg eeo eer ees egc egd ege egg ego egr egs eo- eoc eod eoe eog eoo eor eos erc erd ere erg ero err ers es- esc esd ese esg eso esr ess g-d gcc gcd gce gcg gco gcr gcs gdc gdd gde gdo gdr gds ge- gec ged gee geg geo ger ges ggc ggd ggg ggo ggr ggs goc god goe gog goo gor gos grc grd gre grg gro grr grs gsc gsd gse gsg gso gsr gss oc- occ ocd ocg oco ocr ocs odc odd ode odg odo odr ods oec oed oee oeg oeo oer oes ogc ogd oge ogg ogo ogs oo- ooc ood oog ooo oor oos or- orc ord ore org oro orr ors os- osc osd ose osg oso osr oss rcc rcd rce rcg rco rcr rcs rdc rdd rde rdg rdo rdr rds re- rec red ree reg reo rer res rgc rgd rge rgg rgo rgr rgs roc rod roe rog roo ror ros rrc rrd rrg rrr rrs rsc rsd rse rsg rso rsr rss scc scd sce scg sco scr scs sdc sdd sde sdg sdo sdr sds se- sec sed see seg seo ser ses sgc sgd sge sgg sgo sgr sgs soc sod soe sog soo sor sos sr- src srd sre srg sro srr srs ss- ssc ssd sse ssg sso ssr sss