-er c-- ccc cce ccf ccp ccr ccs cct ce- cec cee cef cep cer ces cet cfc cfe cff cfp cfr cfs cft cpc cpe cpf cpp cpr cps cpt crc cre crf crp crr crs crt csc cse csf csp csr css cst ctc cte ctf ctp ctr cts ctt ec- ecc ece ecf ecr ecs ect eec eee eef eep eer ees eet ef- efc efe eff efp efr efs eft ep- epc epe epf epp epr eps ept erc ere erf erp err ers ert es- esc ese esf esp esr ess est etc ete etf etp etr ets ett fcc fce fcf fcp fcr fcs fct fec fee fef fep fer fes fet ffc ffe fff ffp ffr ffs fft fpc fpe fpp fpr fps fpt frc fre frf frp frr frs frt fsc fse fsf fsp fsr fss fst ftc fte ftf ftp ftr fts ftt p-p pcc pce pcf pcp pcr pcs pct pec pee pef pep per pes pet pfc pfe pff pfp pfr pfs pft ppc ppe ppf ppp ppr pps ppt prc pre prf prp prr prs prt ps- psc pse psf psp psr pss pst pt- ptc pte ptf ptp ptr pts ptt rcc rce rcf rcp rcr rcs rct re- rec ree ref rep rer res ret rfc rfe rff rfp rfr rfs rft rpc rpe rpf rpp rpr rps rpt rrc rrf rrp rrr rrs rrt rsc rse rsf rsp rsr rss rst rtc rte rtf rtp rtr rts rtt scc sce scf scp scr scs sct se- sec see sef sep ser ses set sfc sfe sff sfp sfr sfs sft spc spe spf spp spr sps spt sr- src sre srf srp srr srs srt ss- ssc sse ssf ssp ssr sss sst stc ste stf stp str sts stt tcc tce tcf tcp tcr tcs tct te- tec tee tef tep ter tes tet tfc tfe tff tfp tfr tfs tft tpc tpe tpf tpp tpr tps tpt trc tre trf trp trr trs trt tsc tse tsf tsp tsr tss tst ttc tte ttf ttp ttr tts ttt