-er -ol c-- ccc cce cck ccl cco ccr ce- cec cee cek cel ceo cer ckc cko cl- clc cle clk cll clo clr co- coc coe cok col coo cor crc cre crk crl cro crr ec- ecc ece eck ecl eco ecr eec eee eek eel eeo eer ekc eke ekl eko ekr elc ele elk ell elo elr eo- eoc eoe eok eol eoo eor erc ere erk erl ero err kcc kce kck kcl kcr ke- kec kee kek kel keo ker kkc kke kkk kkl kkr kl- klc klo klr koc koe kok kol koo kor krc krk krl kro krr lcc lce lck lcl lco lcr lec lee lek lel leo ler lkl lkr llc lle llk lll llo llr loc loe lok lol loo lor lrc lrk lro lrr oc- occ ock ocl oco ocr oec oee oel oeo oer okc oke okk okl oko okr olc ole olk oll olo oo- ooc ook ool ooo oor or- orc ore ork orl oro orr rcc rce rcl rco rcr re- rec ree rek rel reo rer rkc rke rkk rko rlc rle rll rlo rlr roc roe rok rol roo ror rrc rrk rrl rrr