-er c-- ccc cce ccg cco ccp ccr cct ce- cec cee ceg ceo cep cer cet cgc cge cgg cgo cgp cgr cgt co- coc coe cog coo cop cor cot cpc cpe cpg cpo cpp cpr cpt crc cre crg cro crp crr crt ctc cte ctg cto ctp ctr ctt ec- ecc ece ecg eco ecr ect eec eee eeg eeo eep eer eet egc ege egg ego egp egr egt eo- eoc eoe eog eoo eop eor eot ep- epc epe epg epo epp epr ept erc ere erg ero erp err ert etc ete etg eto etp etr ett g-p gcc gce gcg gco gcp gcr gct ge- gec gee geg geo gep ger get ggc ggg ggo ggp ggr ggt goc goe gog goo gop gor got gpc gpe gpg gpo gpp gpr gpt grc gre grg gro grp grr grt gtc gte gtg gto gtp gtr gtt oc- occ ocg oco ocp ocr oct oec oee oeg oeo oep oer oet ogc oge ogg ogo ogp ogt oo- ooc oog ooo oop oor oot op- opc ope opg opo opp opr opt or- orc ore org oro orp orr ort ot- otc ote otg oto otp otr ott p-p pcc pce pcg pco pcp pcr pct pec pee peg peo pep per pet pgc pge pgg pgo pgp pgr pgt poc poe pog poo pop por pot ppc ppe ppg ppo ppp ppr ppt prc pre prg pro prp prr prt pt- ptc pte ptg pto ptp ptr ptt rcc rce rcg rco rcp rcr rct re- rec ree reg reo rep rer ret rgc rge rgg rgo rgp rgr rgt roc roe rog roo rop ror rot rpc rpe rpg rpo rpp rpr rpt rrc rrg rrp rrr rrt rtc rte rtg rto rtp rtr rtt tcc tce tcg tco tcp tcr tct te- tec tee teg teo tep ter tet tgc tge tgg tgo tgp tgr tgt to- toc toe tog too top tor tot tpc tpe tpg tpo tpp tpr tpt trc tre trg tro trp trr trt ttc tte ttg tto ttp ttr ttt