-er c-- ccc ccd cce ccl ccr cdc cdd cde cdl cdr ce- cec ced cee cel cer cl- clc cld cle cll clr crc crd cre crl crr dcc dcd dce dcl dcr ddc ddd dde ddl ddr de- dec ded dee del der dl- dlc dld dle dll dlr drc drd dre drl drr ec- ecc ecd ece ecl ecr ed- edc edd ede edl edr eec eed eee eel eer elc eld ele ell elr erc erd ere erl err lcc lcd lce lcl lcr ldc ldd lde ldl ldr lec led lee lel ler llc lld lle lll llr lrc lrd lrr rcc rcd rce rcl rcr rdc rdd rde rdl rdr re- rec red ree rel rer rlc rld rle rll rlr rrc rrd rrl rrr