-er -ol c-- ccc cce ccf ccl cco ccr cct ce- cec cee cef cel ceo cer cet cfc cfe cff cfl cfo cfr cft cl- clc cle clf cll clo clr clt co- coc coe cof col coo cor cot crc cre crf crl cro crr crt ctc cte ctf ctl cto ctr ctt ec- ecc ece ecf ecl eco ecr ect eec eee eef eel eeo eer eet ef- efc efe eff efl efo efr eft elc ele elf ell elo elr elt eo- eoc eoe eof eol eoo eor eot erc ere erf erl ero err ert etc ete etf etl eto etr ett fcc fce fcf fcl fco fcr fct fec fee fef fel feo fer fet ffc ffe fff ffl ffo ffr fft flc fle flf fll flo flr flt foc foe fof fol foo for fot frc fre frf frl fro frr frt ftc fte ftf ftl fto ftr ftt lcc lce lcf lcl lco lcr lct lec lee lef lel leo ler let lfc lfe lff lfl lfo lfr lft llc lle llf lll llo llr llt loc loe lof lol loo lor lot lrc lrf lro lrr lrt ltc lte ltf ltl lto ltr ltt oc- occ ocf ocl oco ocr oct oec oee oef oel oeo oer oet of- ofc ofe off ofl ofo ofr oft olc ole olf oll olo olt oo- ooc oof ool ooo oor oot or- orc ore orf orl oro orr ort ot- otc ote otf otl oto otr ott rcc rce rcf rcl rco rcr rct re- rec ree ref rel reo rer ret rfc rfe rff rfl rfo rfr rft rlc rle rlf rll rlo rlr rlt roc roe rof rol roo ror rot rrc rrf rrl rrr rrt rtc rte rtf rtl rto rtr rtt tcc tce tcf tcl tco tcr tct te- tec tee tef tel teo ter tet tfc tfe tff tfl tfo tfr tft tlc tle tlf tll tlo tlr tlt to- toc toe tof tol too tor tot trc tre trf trl tro trr trt ttc tte ttf ttl tto ttr ttt