-er c-- ccc cce ccf cco ccp ccr ccs cct ce- cec cee cef ceo cep cer ces cet cfc cfe cff cfo cfp cfr cfs cft co- coc coe cof coo cop cor cos cot cpc cpe cpf cpo cpp cpr cps cpt crc cre crf cro crp crr crs crt csc cse csf cso csp csr css cst ctc cte ctf cto ctp ctr cts ctt ec- ecc ece ecf eco ecr ecs ect eec eee eef eeo eep eer ees eet ef- efc efe eff efo efp efr efs eft eo- eoc eoe eof eoo eop eor eos eot ep- epc epe epf epo epp epr eps ept erc ere erf ero erp err ers ert es- esc ese esf eso esp esr ess est etc ete etf eto etp etr ets ett fcc fce fcf fco fcp fcr fcs fct fec fee fef feo fep fer fes fet ffc ffe fff ffo ffp ffr ffs fft foc foe fof foo fop for fos fot fpc fpe fpo fpp fpr fps fpt frc fre frf fro frp frr frs frt fsc fse fsf fso fsp fsr fss fst ftc fte ftf fto ftp ftr fts ftt oc- occ ocf oco ocp ocr ocs oct oec oee oef oeo oep oer oes oet of- ofc ofe off ofo ofp ofr ofs oft oo- ooc oof ooo oop oor oos oot op- opc ope opf opo opp opr ops opt or- orc ore orf oro orp orr ors ort os- osc ose osf oso osp osr oss ost ot- otc ote otf oto otp otr ots ott p-p pcc pce pcf pco pcp pcr pcs pct pec pee pef peo pep per pes pet pfc pfe pff pfo pfp pfr pfs pft poc poe pof poo pop por pos pot ppc ppe ppf ppo ppp ppr pps ppt prc pre prf pro prp prr prs prt ps- psc pse psf pso psp psr pss pst pt- ptc pte ptf pto ptp ptr pts ptt rcc rce rcf rco rcp rcr rcs rct re- rec ree ref reo rep rer res ret rfc rfe rff rfo rfp rfr rfs rft roc roe rof roo rop ror ros rot rpc rpe rpf rpo rpp rpr rps rpt rrc rrf rrp rrr rrs rrt rsc rse rsf rso rsp rsr rss rst rtc rte rtf rto rtp rtr rts rtt scc sce scf sco scp scr scs sct se- sec see sef seo sep ser ses set sfc sfe sff sfo sfp sfr sfs sft soc soe sof soo sop sor sos sot spc spe spf spo spp spr sps spt sr- src sre srf sro srp srr srs srt ss- ssc sse ssf sso ssp ssr sss sst stc ste stf sto stp str sts stt tcc tce tcf tco tcp tcr tcs tct te- tec tee tef teo tep ter tes tet tfc tfe tff tfo tfp tfr tfs tft to- toc toe tof too top tor tos tot tpc tpe tpf tpo tpp tpr tps tpt trc tre trf tro trp trr trs trt tsc tse tsf tso tsp tsr tss tst ttc tte ttf tto ttp ttr tts ttt