-er c-- ccc cce ccf ccl ccr cct ce- cec cee cef cel cer cet cfc cfe cff cfl cfr cft cl- clc cle clf cll clr clt crc cre crf crl crr crt ctc cte ctf ctl ctr ctt ec- ecc ece ecf ecl ecr ect eec eee eef eel eer eet ef- efc efe eff efl efr eft elc ele elf ell elr elt erc ere erf erl err ert etc ete etf etl etr ett fcc fce fcf fcl fcr fct fec fee fef fel fer fet ffc ffe fff ffl ffr fft flc fle flf fll flr flt frc fre frf frl frr frt ftc fte ftf ftl ftr ftt lcc lce lcf lcl lcr lct lec lee lef lel ler let lfc lfe lff lfl lfr lft llc lle llf lll llr llt lrc lrf lrr lrt ltc lte ltf ltl ltr ltt rcc rce rcf rcl rcr rct re- rec ree ref rel rer ret rfc rfe rff rfl rfr rft rlc rle rlf rll rlr rlt rrc rrf rrl rrr rrt rtc rte rtf rtl rtr rtt tcc tce tcf tcl tcr tct te- tec tee tef tel ter tet tfc tfe tff tfl tfr tft tlc tle tlf tll tlr tlt trc tre trf trl trr trt ttc tte ttf ttl ttr ttt