-ol c-- ccc cce ccf cck ccl cco ccs ce- cec cee cef cek cel ceo ces cfc cfe cff cfk cfl cfo cfs ckc cko cks cl- clc cle clf clk cll clo cls co- coc coe cof cok col coo cos csc cse csf csk csl cso css ec- ecc ece ecf eck ecl eco ecs eec eee eef eek eel eeo ees ef- efc efe eff efl efo efs ekc eke ekf ekl eko eks elc ele elf elk ell elo els eo- eoc eoe eof eok eol eoo eos es- esc ese esf esk esl eso ess fcc fce fcf fck fcl fco fcs fec fee fef fek fel feo fes ffc ffe fff ffk ffl ffo ffs fkc fkf fkk fkl flc fle flf fll flo fls foc foe fof fok fol foo fos fsc fse fsf fsk fsl fso fss kcc kce kck kcl kcs ke- kec kee kef kek kel keo kes kfc kff kfo kfs kkc kke kkk kkl kks kl- klc klf klo kls koc koe kof kok kol koo kos ksc kse ksf ksk ksl kso kss lcc lce lcf lck lcl lco lcs lec lee lef lek lel leo les lfc lfe lff lfk lfl lfo lfs lkl lks llc lle llf llk lll llo lls loc loe lof lok lol loo los lsc lse lsf lsk lsl lso lss oc- occ ocf ock ocl oco ocs oec oee oef oel oeo oes of- ofc ofe off ofl ofo ofs okc oke okk okl oko oks olc ole olf olk oll olo ols oo- ooc oof ook ool ooo oos os- osc ose osf osk osl oso oss scc sce scf sck scl sco scs se- sec see sef sek sel seo ses sfc sfe sff sfk sfl sfo sfs sk- skc ske skf skk skl sko sks slc sle slf slk sll slo sls soc soe sof sok sol soo sos ss- ssc sse ssf ssk ssl sso sss