-ol c-- ccc ccd cce cck ccl cco cdc cdd cde cdk cdl cdo ce- cec ced cee cek cel ceo ckc ckd cko cl- clc cld cle clk cll clo co- coc cod coe cok col coo dcc dcd dce dck dcl dco ddc ddd dde ddk ddl ddo de- dec ded dee dek del deo dkc dke dkk dkl dko dl- dlc dld dle dlk dll dlo doc dod doe dok dol doo ec- ecc ecd ece eck ecl eco ed- edc edd ede edk edl edo eec eed eee eek eel eeo ekc ekd eke ekl eko elc eld ele elk ell elo eo- eoc eod eoe eok eol eoo kcc kcd kce kck kcl kdc kde kdk kdl kdo ke- kec ked kee kek kel keo kkc kke kkk kkl kl- klc kld klo koc kod koe kok kol koo lcc lcd lce lck lcl lco ldc ldd lde ldk ldl ldo lec led lee lek lel leo lkl llc lld lle llk lll llo loc lod loe lok lol loo oc- occ ocd ock ocl oco odc odd ode odl odo oec oed oee oel oeo okc okd oke okk okl oko olc old ole olk oll olo oo- ooc ood ook ool ooo