-er c-- ccc ccd cce cck ccl ccr cdc cdd cde cdk cdl cdr ce- cec ced cee cek cel cer ckc ckd cl- clc cld cle clk cll clr crc crd cre crk crl crr dcc dcd dce dck dcl dcr ddc ddd dde ddk ddl ddr de- dec ded dee dek del der dkc dke dkk dkl dkr dl- dlc dld dle dlk dll dlr drc drd dre drk drl drr ec- ecc ecd ece eck ecl ecr ed- edc edd ede edk edl edr eec eed eee eek eel eer ekc ekd eke ekl ekr elc eld ele elk ell elr erc erd ere erk erl err kcc kcd kce kck kcl kcr kdc kde kdk kdl kdr ke- kec ked kee kek kel ker kkc kke kkk kkl kkr kl- klc kld klr krc krd krk krl krr lcc lcd lce lck lcl lcr ldc ldd lde ldk ldl ldr lec led lee lek lel ler lkl lkr llc lld lle llk lll llr lrc lrd lrk lrr rcc rcd rce rcl rcr rdc rdd rde rdl rdr re- rec red ree rek rel rer rkc rke rkk rlc rld rle rll rlr rrc rrd rrk rrl rrr