-er c-- ccc cce ccf cck cco ccp ccr cct ce- cec cee cef cek ceo cep cer cet cfc cfe cff cfk cfo cfp cfr cft ckc cko ckt co- coc coe cof cok coo cop cor cot cpc cpe cpf cpk cpo cpp cpr cpt crc cre crf crk cro crp crr crt ctc cte ctf ctk cto ctp ctr ctt ec- ecc ece ecf eck eco ecr ect eec eee eef eek eeo eep eer eet ef- efc efe eff efo efp efr eft ekc eke ekf eko ekp ekr ekt eo- eoc eoe eof eok eoo eop eor eot ep- epc epe epf epo epp epr ept erc ere erf erk ero erp err ert etc ete etf etk eto etp etr ett fcc fce fcf fck fco fcp fcr fct fec fee fef fek feo fep fer fet ffc ffe fff ffk ffo ffp ffr fft fkc fkf fkk fkp fkt foc foe fof fok foo fop for fot fpc fpe fpk fpo fpp fpr fpt frc fre frf frk fro frp frr frt ftc fte ftf ftk fto ftp ftr ftt k-t kcc kce kck kcp kcr kct ke- kec kee kef kek keo kep ker ket kfc kff kfo kkc kke kkk kkp kkr kkt koc koe kof kok koo kop kor kot kpc kpe kpf kpk kpo kpp kpr kpt krc krf krk kro krp krr krt ktc kte ktf ktk kto ktp ktr ktt oc- occ ocf ock oco ocp ocr oct oec oee oef oeo oep oer oet of- ofc ofe off ofo ofp ofr oft okc oke okk oko okp okr oo- ooc oof ook ooo oop oor oot op- opc ope opf opk opo opp opr opt or- orc ore orf ork oro orp orr ort ot- otc ote otf otk oto otp otr ott p-p pcc pce pcf pck pco pcp pcr pct pec pee pef pek peo pep per pet pfc pfe pff pfk pfo pfp pfr pft pkc pke pkf pko pkp pkr pkt poc poe pof pok poo pop por pot ppc ppe ppf ppk ppo ppp ppr ppt prc pre prf prk pro prp prr prt pt- ptc pte ptf ptk pto ptp ptr ptt rcc rce rcf rco rcp rcr rct re- rec ree ref rek reo rep rer ret rfc rfe rff rfk rfo rfp rfr rft rkc rke rkf rkk rko rkp rkt roc roe rof rok roo rop ror rot rpc rpe rpf rpk rpo rpp rpr rpt rrc rrf rrk rrp rrr rrt rtc rte rtf rtk rto rtp rtr rtt tcc tce tcf tck tco tcp tcr tct te- tec tee tef tek teo tep ter tet tfc tfe tff tfk tfo tfp tfr tft tkc tke tkk tko tkp tkr tkt to- toc toe tof tok too top tor tot tpc tpe tpf tpk tpo tpp tpr tpt trc tre trf trk tro trp trr trt ttc tte ttf ttk tto ttp ttr ttt