-er c-- ccc ccd cce ccf cck ccl ccr cdc cdd cde cdf cdk cdl cdr ce- cec ced cee cef cek cel cer cfc cfd cfe cff cfk cfl cfr ckc ckd cl- clc cld cle clf clk cll clr crc crd cre crf crk crl crr dcc dcd dce dcf dck dcl dcr ddc ddd dde ddf ddk ddl ddr de- dec ded dee def dek del der dfc dfd dfe dff dfk dfl dfr dkc dke dkk dkl dkr dl- dlc dld dle dlf dlk dll dlr drc drd dre drk drl drr ec- ecc ecd ece ecf eck ecl ecr ed- edc edd ede edf edk edl edr eec eed eee eef eek eel eer ef- efc efd efe eff efl efr ekc ekd eke ekf ekl ekr elc eld ele elf elk ell elr erc erd ere erf erk erl err fcc fcd fce fcf fck fcl fcr fdc fdd fde fdf fdk fdl fdr fec fed fee fef fek fel fer ffc ffd ffe fff ffk ffl ffr fkc fkf fkk fkl flc fld fle flf fll flr frc frd fre frf frk frl frr kcc kcd kce kck kcl kcr kdc kde kdf kdk kdl kdr ke- kec ked kee kef kek kel ker kfc kfd kff kkc kke kkk kkl kkr kl- klc kld klf klr krc krd krf krk krl krr lcc lcd lce lcf lck lcl lcr ldc ldd lde ldf ldk ldl ldr lec led lee lef lek lel ler lfc lfd lfe lff lfk lfl lfr lkl lkr llc lld lle llf llk lll llr lrc lrd lrf lrk lrr rcc rcd rce rcf rcl rcr rdc rdd rde rdf rdl rdr re- rec red ree ref rek rel rer rfc rfd rfe rff rfk rfl rfr rkc rke rkf rkk rlc rld rle rlf rll rlr rrc rrd rrf rrk rrl rrr