-er -ol c-- ccc cce ccf cck ccl cco ccr ce- cec cee cef cek cel ceo cer cfc cfe cff cfk cfl cfo cfr ckc cko cl- clc cle clf clk cll clo clr co- coc coe cof cok col coo cor crc cre crf crk crl cro crr ec- ecc ece ecf eck ecl eco ecr eec eee eef eek eel eeo eer ef- efc efe eff efl efo efr ekc eke ekf ekl eko ekr elc ele elf elk ell elo elr eo- eoc eoe eof eok eol eoo eor erc ere erf erk erl ero err fcc fce fcf fck fcl fco fcr fec fee fef fek fel feo fer ffc ffe fff ffk ffl ffo ffr fkc fkf fkk fkl flc fle flf fll flo flr foc foe fof fok fol foo for frc fre frf frk frl fro frr kcc kce kck kcl kcr ke- kec kee kef kek kel keo ker kfc kff kfo kkc kke kkk kkl kkr kl- klc klf klo klr koc koe kof kok kol koo kor krc krf krk krl kro krr lcc lce lcf lck lcl lco lcr lec lee lef lek lel leo ler lfc lfe lff lfk lfl lfo lfr lkl lkr llc lle llf llk lll llo llr loc loe lof lok lol loo lor lrc lrf lrk lro lrr oc- occ ocf ock ocl oco ocr oec oee oef oel oeo oer of- ofc ofe off ofl ofo ofr okc oke okk okl oko okr olc ole olf olk oll olo oo- ooc oof ook ool ooo oor or- orc ore orf ork orl oro orr rcc rce rcf rcl rco rcr re- rec ree ref rek rel reo rer rfc rfe rff rfk rfl rfo rfr rkc rke rkf rkk rko rlc rle rlf rll rlo rlr roc roe rof rok rol roo ror rrc rrf rrk rrl rrr