-er -ol c-- ccc cce ccf ccl cco ccr ccx ce- cec cee cef cel ceo cer cex cfc cfe cff cfl cfo cfr cfx cl- clc cle clf cll clo clr clx co- coc coe cof col coo cor cox crc cre crf crl cro crr crx cxc cxf cxl cxo cxr cxx ec- ecc ece ecf ecl eco ecr ecx eec eee eef eel eeo eer eex ef- efc efe eff efl efo efr efx elc ele elf ell elo elr elx eo- eoc eoe eof eol eoo eor erc ere erf erl ero err ex- exc exe exl exo exr exx fcc fce fcf fcl fco fcr fcx fec fee fef fel feo fer fex ffc ffe fff ffl ffo ffr ffx flc fle flf fll flo flr flx foc foe fof fol foo for fox frc fre frf frl fro frr fxe fxr fxx lcc lce lcf lcl lco lcr lcx lec lee lef lel leo ler lex lfc lfe lff lfl lfo lfr lfx llc lle llf lll llo llr loc loe lof lol loo lor lox lrc lrf lro lrr lxc lxo lxr lxx oc- occ ocf ocl oco ocr ocx oec oee oef oel oeo oer oex of- ofc ofe off ofl ofo ofr ofx olc ole olf oll olo oo- ooc oof ool ooo oor oox or- orc ore orf orl oro orr orx ox- oxc oxf oxo oxx rcc rce rcf rcl rco rcr rcx re- rec ree ref rel reo rer rex rfc rfe rff rfl rfo rfr rlc rle rlf rll rlo rlr roc roe rof rol roo ror rox rrc rrf rrl rrr rxr xcf xcl xcr xcx xee xel xer xex xfe xfl xfx xlf xlr xoc xof xoo xor xox xrc xrf xrx xxl xxo xxx