-er -ol c-- ccc cce ccf ccl cco ccr ccs ce- cec cee cef cel ceo cer ces cfc cfe cff cfl cfo cfr cfs cl- clc cle clf cll clo clr cls co- coc coe cof col coo cor cos crc cre crf crl cro crr crs csc cse csf csl cso csr css ec- ecc ece ecf ecl eco ecr ecs eec eee eef eel eeo eer ees ef- efc efe eff efl efo efr efs elc ele elf ell elo elr els eo- eoc eoe eof eol eoo eor eos erc ere erf erl ero err ers es- esc ese esf esl eso esr ess fcc fce fcf fcl fco fcr fcs fec fee fef fel feo fer fes ffc ffe fff ffl ffo ffr ffs flc fle flf fll flo flr fls foc foe fof fol foo for fos frc fre frf frl fro frr frs fsc fse fsf fsl fso fsr fss lcc lce lcf lcl lco lcr lcs lec lee lef lel leo ler les lfc lfe lff lfl lfo lfr lfs llc lle llf lll llo llr lls loc loe lof lol loo lor los lrc lrf lro lrr lrs lsc lse lsf lsl lso lsr lss oc- occ ocf ocl oco ocr ocs oec oee oef oel oeo oer oes of- ofc ofe off ofl ofo ofr ofs olc ole olf oll olo ols oo- ooc oof ool ooo oor oos or- orc ore orf orl oro orr ors os- osc ose osf osl oso osr oss rcc rce rcf rcl rco rcr rcs re- rec ree ref rel reo rer res rfc rfe rff rfl rfo rfr rfs rlc rle rlf rll rlo rlr rls roc roe rof rol roo ror ros rrc rrf rrl rrr rrs rsc rse rsf rsl rso rsr rss scc sce scf scl sco scr scs se- sec see sef sel seo ser ses sfc sfe sff sfl sfo sfr sfs slc sle slf sll slo slr sls soc soe sof sol soo sor sos sr- src sre srf srl sro srr srs ss- ssc sse ssf ssl sso ssr sss