-ol c-- ccc ccd cce ccf ccl cco cdc cdd cde cdf cdl cdo ce- cec ced cee cef cel ceo cfc cfd cfe cff cfl cfo cl- clc cld cle clf cll clo co- coc cod coe cof col coo dcc dcd dce dcf dcl dco ddc ddd dde ddf ddl ddo de- dec ded dee def del deo dfc dfd dfe dff dfl dfo dl- dlc dld dle dlf dll dlo doc dod doe dof dol doo ec- ecc ecd ece ecf ecl eco ed- edc edd ede edf edl edo eec eed eee eef eel eeo ef- efc efd efe eff efl efo elc eld ele elf ell elo eo- eoc eod eoe eof eol eoo fcc fcd fce fcf fcl fco fdc fdd fde fdf fdl fdo fec fed fee fef fel feo ffc ffd ffe fff ffl ffo flc fld fle flf fll flo foc foe fof fol foo lcc lcd lce lcf lcl lco ldc ldd lde ldf ldl ldo lec led lee lef lel leo lfc lfd lfe lff lfl lfo llc lld lle llf lll llo loc lod loe lof lol loo oc- occ ocd ocf ocl oco odc odd ode odf odl odo oec oed oee oef oel oeo of- ofc ofd ofe off ofl ofo olc old ole olf oll olo oo- ooc ood oof ool ooo