-er c-- ccc cce ccg ccn cco ccr ccs cct ce- cec cee ceg cen ceo cer ces cet cgc cge cgg cgn cgo cgr cgs cgt cn- cnc cne cng cnn cno cnr cns cnt co- coc coe cog con coo cor cos cot crc cre crg crn cro crr crs crt csc cse csg csn cso csr css cst ctc cte ctg ctn cto ctr cts ctt ec- ecc ece ecg ecn eco ecr ecs ect eec eee eeg een eeo eer ees eet egc ege egg egn ego egr egs egt en- enc ene eng enn eno enr ens ent eo- eoc eoe eog eon eoo eor eos eot erc ere erg ern ero err ers ert es- esc ese esg esn eso esr ess est etc ete etg etn eto etr ets ett gcc gce gcg gcn gco gcr gcs gct ge- gec gee geg gen geo ger ges get ggc ggg ggn ggo ggr ggs ggt gnc gne gnn gno gnr gns gnt goc goe gog gon goo gor gos got grc gre grg grn gro grr grs grt gsc gse gsg gsn gso gsr gss gst gtc gte gtg gtn gto gtr gts gtt ncc nce ncg ncn nco ncr ncs nct ne- nec nee neg nen neo ner nes net ngc nge ngg ngn ngo ngs ngt nnc nne nng nnn nno nns nnt no- noc noe nog non noo nor nos not nrc nre nrg nrn nro nrr nrs nrt nsc nse nsg nsn nso nsr nss nst ntc nte ntg ntn nto ntr nts ntt oc- occ ocg ocn oco ocr ocs oct oec oee oeg oen oeo oer oes oet ogc oge ogg ogn ogo ogs ogt on- onc one ong onn ono onr ons ont oo- ooc oog oon ooo oor oos oot or- orc ore org orn oro orr ors ort os- osc ose osg osn oso osr oss ost ot- otc ote otg otn oto otr ots ott rcc rce rcg rcn rco rcr rcs rct re- rec ree reg ren reo rer res ret rgc rge rgg rgn rgo rgr rgs rgt rnc rng rnn rno rnr rns rnt roc roe rog ron roo ror ros rot rrc rrg rrn rrr rrs rrt rsc rse rsg rsn rso rsr rss rst rtc rte rtg rtn rto rtr rts rtt scc sce scg scn sco scr scs sct se- sec see seg sen seo ser ses set sgc sge sgg sgn sgo sgr sgs sgt snc sne sng snn sno snr sns snt soc soe sog son soo sor sos sot sr- src sre srg srn sro srr srs srt ss- ssc sse ssg ssn sso ssr sss sst stc ste stg stn sto str sts stt tcc tce tcg tcn tco tcr tcs tct te- tec tee teg ten teo ter tes tet tgc tge tgg tgn tgo tgr tgs tgt tnc tne tng tnn tno tnr tns tnt to- toc toe tog ton too tor tos tot trc tre trg trn tro trr trs trt tsc tse tsg tsn tso tsr tss tst ttc tte ttg ttn tto ttr tts ttt