-er c-- ccc cce ccg cck cco ccp ccr ccs ce- cec cee ceg cek ceo cep cer ces cgc cge cgg cgo cgp cgr cgs ckc cko cks co- coc coe cog cok coo cop cor cos cpc cpe cpg cpk cpo cpp cpr cps crc cre crg crk cro crp crr crs csc cse csg csk cso csp csr css ec- ecc ece ecg eck eco ecr ecs eec eee eeg eek eeo eep eer ees egc ege egg ego egp egr egs ekc eke ekg eko ekp ekr eks eo- eoc eoe eog eok eoo eop eor eos ep- epc epe epg epo epp epr eps erc ere erg erk ero erp err ers es- esc ese esg esk eso esp esr ess g-p gcc gce gcg gck gco gcp gcr gcs ge- gec gee geg gek geo gep ger ges ggc ggg ggo ggp ggr ggs gko gkp gks goc goe gog gok goo gop gor gos gpc gpe gpg gpk gpo gpp gpr gps grc gre grg grk gro grp grr grs gsc gse gsg gsk gso gsp gsr gss kcc kce kcg kck kcp kcr kcs ke- kec kee keg kek keo kep ker kes kgc kgo kgp kgs kkc kke kkk kkp kkr kks koc koe kog kok koo kop kor kos kpc kpe kpk kpo kpp kpr kps krc krg krk kro krp krr krs ksc kse ksg ksk kso ksp ksr kss oc- occ ocg ock oco ocp ocr ocs oec oee oeg oeo oep oer oes ogc oge ogg ogo ogp ogs okc oke okg okk oko okp okr oks oo- ooc oog ook ooo oop oor oos op- opc ope opg opk opo opp opr ops or- orc ore org ork oro orp orr ors os- osc ose osg osk oso osp osr oss p-p pcc pce pcg pck pco pcp pcr pcs pec pee peg pek peo pep per pes pgc pge pgg pgk pgo pgp pgr pgs pkc pke pkg pko pkp pkr pks poc poe pog pok poo pop por pos ppc ppe ppg ppk ppo ppp ppr pps prc pre prg prk pro prp prr prs ps- psc pse psg psk pso psp psr pss rcc rce rcg rco rcp rcr rcs re- rec ree reg rek reo rep rer res rgc rge rgg rgk rgo rgp rgr rgs rkc rke rkg rkk rko rkp rks roc roe rog rok roo rop ror ros rpc rpe rpg rpk rpo rpp rpr rps rrc rrg rrk rrp rrr rrs rsc rse rsg rsk rso rsp rsr rss scc sce scg sck sco scp scr scs se- sec see seg sek seo sep ser ses sgc sge sgg sgk sgo sgp sgr sgs sk- skc ske skg skk sko skp skr sks soc soe sog sok soo sop sor sos spc spe spg spk spo spp spr sps sr- src sre srg srk sro srp srr srs ss- ssc sse ssg ssk sso ssp ssr sss