-er c-- ccc cce ccf cck ccl ccr ce- cec cee cef cek cel cer cfc cfe cff cfk cfl cfr ckc cl- clc cle clf clk cll clr crc cre crf crk crl crr ec- ecc ece ecf eck ecl ecr eec eee eef eek eel eer ef- efc efe eff efl efr ekc eke ekf ekl ekr elc ele elf elk ell elr erc ere erf erk erl err fcc fce fcf fck fcl fcr fec fee fef fek fel fer ffc ffe fff ffk ffl ffr fkc fkf fkk fkl flc fle flf fll flr frc fre frf frk frl frr kcc kce kck kcl kcr ke- kec kee kef kek kel ker kfc kff kkc kke kkk kkl kkr kl- klc klf klr krc krf krk krl krr lcc lce lcf lck lcl lcr lec lee lef lek lel ler lfc lfe lff lfk lfl lfr lkl lkr llc lle llf llk lll llr lrc lrf lrk lrr rcc rce rcf rcl rcr re- rec ree ref rek rel rer rfc rfe rff rfk rfl rfr rkc rke rkf rkk rlc rle rlf rll rlr rrc rrf rrk rrl rrr