-er c-- ccc cce ccf cco ccp ccr cct ce- cec cee cef ceo cep cer cet cfc cfe cff cfo cfp cfr cft co- coc coe cof coo cop cor cot cpc cpe cpf cpo cpp cpr cpt crc cre crf cro crp crr crt ctc cte ctf cto ctp ctr ctt ec- ecc ece ecf eco ecr ect eec eee eef eeo eep eer eet ef- efc efe eff efo efp efr eft eo- eoc eoe eof eoo eop eor eot ep- epc epe epf epo epp epr ept erc ere erf ero erp err ert etc ete etf eto etp etr ett fcc fce fcf fco fcp fcr fct fec fee fef feo fep fer fet ffc ffe fff ffo ffp ffr fft foc foe fof foo fop for fot fpc fpe fpo fpp fpr fpt frc fre frf fro frp frr frt ftc fte ftf fto ftp ftr ftt oc- occ ocf oco ocp ocr oct oec oee oef oeo oep oer oet of- ofc ofe off ofo ofp ofr oft oo- ooc oof ooo oop oor oot op- opc ope opf opo opp opr opt or- orc ore orf oro orp orr ort ot- otc ote otf oto otp otr ott p-p pcc pce pcf pco pcp pcr pct pec pee pef peo pep per pet pfc pfe pff pfo pfp pfr pft poc poe pof poo pop por pot ppc ppe ppf ppo ppp ppr ppt prc pre prf pro prp prr prt pt- ptc pte ptf pto ptp ptr ptt rcc rce rcf rco rcp rcr rct re- rec ree ref reo rep rer ret rfc rfe rff rfo rfp rfr rft roc roe rof roo rop ror rot rpc rpe rpf rpo rpp rpr rpt rrc rrf rrp rrr rrt rtc rte rtf rto rtp rtr rtt tcc tce tcf tco tcp tcr tct te- tec tee tef teo tep ter tet tfc tfe tff tfo tfp tfr tft to- toc toe tof too top tor tot tpc tpe tpf tpo tpp tpr tpt trc tre trf tro trp trr trt ttc tte ttf tto ttp ttr ttt