-er -ol c-- ccc cce cck ccl cco ccr ccv ce- cec cee cek cel ceo cer cev ckc cko cl- clc cle clk cll clo clr clv co- coc coe cok col coo cor cov crc cre crk crl cro crr crv cvc cve cvk cvl cvo cvr cvv ec- ecc ece eck ecl eco ecr ecv eec eee eek eel eeo eer eev ekc eke ekl eko ekr ekv elc ele elk ell elo elr elv eo- eoc eoe eok eol eoo eor erc ere erk erl ero err erv evc eve evl evo evr evv kcc kce kck kcl kcr ke- kec kee kek kel keo ker kev kkc kke kkk kkl kkr kkv kl- klc klo klr klv koc koe kok kol koo kor krc krk krl kro krr krv kvk kvo kvr kvv lcc lce lck lcl lco lcr lcv lec lee lek lel leo ler lev lkl lkr llc lle llk lll llo llr llv loc loe lok lol loo lor lov lrc lrk lro lrr lrv lvc lve lvl lvr lvv oc- occ ock ocl oco ocr ocv oec oee oel oeo oer okc oke okk okl oko okr olc ole olk oll olo oo- ooc ook ool ooo oor oov or- orc ore ork orl oro orr orv ov- ovc ove ovl ovo ovv rcc rce rcl rco rcr rcv re- rec ree rek rel reo rer rev rkc rke rkk rko rkv rlc rle rll rlo rlr roc roe rok rol roo ror rov rrc rrk rrl rrr rvc rve rvl rvo rvr rvv v-e vcc vce vcl vco vcr vec vee vek vel veo ver vl- vlc vle vlk vll vlo vlv voc voe vok vol voo vor vov vrc vre vrk vrr vvc vvo vvr vvv