-ol c-- ccc cce cck ccl cco ccv ce- cec cee cek cel ceo cev ckc cko cl- clc cle clk cll clo clv co- coc coe cok col coo cov cvc cve cvk cvl cvo cvv ec- ecc ece eck ecl eco ecv eec eee eek eel eeo eev ekc eke ekl eko ekv elc ele elk ell elo elv eo- eoc eoe eok eol eoo evc eve evl evo evv kcc kce kck kcl ke- kec kee kek kel keo kev kkc kke kkk kkl kkv kl- klc klo klv koc koe kok kol koo kvk kvo kvv lcc lce lck lcl lco lcv lec lee lek lel leo lev lkl llc lle llk lll llo llv loc loe lok lol loo lov lvc lve lvl lvv oc- occ ock ocl oco ocv oec oee oel oeo okc oke okk okl oko olc ole olk oll olo oo- ooc ook ool ooo oov ov- ovc ove ovl ovo ovv v-e vcc vce vcl vco vec vee vek vel veo vl- vlc vle vlk vll vlo vlv voc voe vok vol voo vov vvc vvo vvv