-er -ol c-- ccc cce ccl cco ccr ccx ce- cec cee cel ceo cer cex cl- clc cle cll clo clr clx co- coc coe col coo cor cox crc cre crl cro crr crx cxc cxl cxo cxr cxx ec- ecc ece ecl eco ecr ecx eec eee eel eeo eer eex elc ele ell elo elr elx eo- eoc eoe eol eoo eor erc ere erl ero err ex- exc exe exl exo exr exx lcc lce lcl lco lcr lcx lec lee lel leo ler lex llc lle lll llo llr loc loe lol loo lor lox lrc lro lrr lxc lxo lxr lxx oc- occ ocl oco ocr ocx oec oee oel oeo oer oex olc ole oll olo oo- ooc ool ooo oor oox or- orc ore orl oro orr orx ox- oxc oxo oxx rcc rce rcl rco rcr rcx re- rec ree rel reo rer rex rlc rle rll rlo rlr roc roe rol roo ror rox rrc rrl rrr rxr xcl xcr xcx xee xel xer xex xlr xoc xoo xor xox xrc xrx xxl xxo xxx