-er c-- ccc ccd cce ccl ccr cct cdc cdd cde cdl cdr cdt ce- cec ced cee cel cer cet cl- clc cld cle cll clr clt crc crd cre crl crr crt ctc ctd cte ctl ctr ctt dcc dcd dce dcl dcr dct ddc ddd dde ddl ddr ddt de- dec ded dee del der det dl- dlc dld dle dll dlr dlt drc drd dre drl drr drt dtc dtd dte dtl dtr dtt ec- ecc ecd ece ecl ecr ect ed- edc edd ede edl edr edt eec eed eee eel eer eet elc eld ele ell elr elt erc erd ere erl err ert etc etd ete etl etr ett lcc lcd lce lcl lcr lct ldc ldd lde ldl ldr ldt lec led lee lel ler let llc lld lle lll llr llt lrc lrd lrr lrt ltc ltd lte ltl ltr ltt rcc rcd rce rcl rcr rct rdc rdd rde rdl rdr rdt re- rec red ree rel rer ret rlc rld rle rll rlr rlt rrc rrd rrl rrr rrt rtc rtd rte rtl rtr rtt tcc tcd tce tcl tcr tct tdc tdd tde tdl tdr tdt te- tec ted tee tel ter tet tlc tld tle tll tlr tlt trc trd tre trl trr trt ttc ttd tte ttl ttr ttt