-er -ol c-- ccc cce ccl cco ccr cct ce- cec cee cel ceo cer cet cl- clc cle cll clo clr clt co- coc coe col coo cor cot crc cre crl cro crr crt ctc cte ctl cto ctr ctt ec- ecc ece ecl eco ecr ect eec eee eel eeo eer eet elc ele ell elo elr elt eo- eoc eoe eol eoo eor eot erc ere erl ero err ert etc ete etl eto etr ett lcc lce lcl lco lcr lct lec lee lel leo ler let llc lle lll llo llr llt loc loe lol loo lor lot lrc lro lrr lrt ltc lte ltl lto ltr ltt oc- occ ocl oco ocr oct oec oee oel oeo oer oet olc ole oll olo olt oo- ooc ool ooo oor oot or- orc ore orl oro orr ort ot- otc ote otl oto otr ott rcc rce rcl rco rcr rct re- rec ree rel reo rer ret rlc rle rll rlo rlr rlt roc roe rol roo ror rot rrc rrl rrr rrt rtc rte rtl rto rtr rtt tcc tce tcl tco tcr tct te- tec tee tel teo ter tet tlc tle tll tlo tlr tlt to- toc toe tol too tor tot trc tre trl tro trr trt ttc tte ttl tto ttr ttt