-ol c-- ccc cce cck ccl cco ccs ce- cec cee cek cel ceo ces ckc cko cks cl- clc cle clk cll clo cls co- coc coe cok col coo cos csc cse csk csl cso css ec- ecc ece eck ecl eco ecs eec eee eek eel eeo ees ekc eke ekl eko eks elc ele elk ell elo els eo- eoc eoe eok eol eoo eos es- esc ese esk esl eso ess kcc kce kck kcl kcs ke- kec kee kek kel keo kes kkc kke kkk kkl kks kl- klc klo kls koc koe kok kol koo kos ksc kse ksk ksl kso kss lcc lce lck lcl lco lcs lec lee lek lel leo les lkl lks llc lle llk lll llo lls loc loe lok lol loo los lsc lse lsk lsl lso lss oc- occ ock ocl oco ocs oec oee oel oeo oes okc oke okk okl oko oks olc ole olk oll olo ols oo- ooc ook ool ooo oos os- osc ose osk osl oso oss scc sce sck scl sco scs se- sec see sek sel seo ses sk- skc ske skk skl sko sks slc sle slk sll slo sls soc soe sok sol soo sos ss- ssc sse ssk ssl sso sss