-er c-- ccc cce cco ccp ccr ccs cct ce- cec cee ceo cep cer ces cet co- coc coe coo cop cor cos cot cpc cpe cpo cpp cpr cps cpt crc cre cro crp crr crs crt csc cse cso csp csr css cst ctc cte cto ctp ctr cts ctt ec- ecc ece eco ecr ecs ect eec eee eeo eep eer ees eet eo- eoc eoe eoo eop eor eos eot ep- epc epe epo epp epr eps ept erc ere ero erp err ers ert es- esc ese eso esp esr ess est etc ete eto etp etr ets ett oc- occ oco ocp ocr ocs oct oec oee oeo oep oer oes oet oo- ooc ooo oop oor oos oot op- opc ope opo opp opr ops opt or- orc ore oro orp orr ors ort os- osc ose oso osp osr oss ost ot- otc ote oto otp otr ots ott p-p pcc pce pco pcp pcr pcs pct pec pee peo pep per pes pet poc poe poo pop por pos pot ppc ppe ppo ppp ppr pps ppt prc pre pro prp prr prs prt ps- psc pse pso psp psr pss pst pt- ptc pte pto ptp ptr pts ptt rcc rce rco rcp rcr rcs rct re- rec ree reo rep rer res ret roc roe roo rop ror ros rot rpc rpe rpo rpp rpr rps rpt rrc rrp rrr rrs rrt rsc rse rso rsp rsr rss rst rtc rte rto rtp rtr rts rtt scc sce sco scp scr scs sct se- sec see seo sep ser ses set soc soe soo sop sor sos sot spc spe spo spp spr sps spt sr- src sre sro srp srr srs srt ss- ssc sse sso ssp ssr sss sst stc ste sto stp str sts stt tcc tce tco tcp tcr tcs tct te- tec tee teo tep ter tes tet to- toc toe too top tor tos tot tpc tpe tpo tpp tpr tps tpt trc tre tro trp trr trs trt tsc tse tso tsp tsr tss tst ttc tte tto ttp ttr tts ttt