-ol c-- ccc ccd ccf ccl cco cdc cdd cdf cdl cdo cfc cfd cff cfl cfo cl- clc cld clf cll clo co- coc cod cof col coo dcc dcd dcf dcl dco ddc ddd ddf ddl ddo dfc dfd dff dfl dfo dl- dlc dld dlf dll dlo doc dod dof dol doo fcc fcd fcf fcl fco fdc fdd fdf fdl fdo ffc ffd fff ffl ffo flc fld flf fll flo foc fof fol foo lcc lcd lcf lcl lco ldc ldd ldf ldl ldo lfc lfd lff lfl lfo llc lld llf lll llo loc lod lof lol loo oc- occ ocd ocf ocl oco odc odd odf odl odo of- ofc ofd off ofl ofo olc old olf oll olo oo- ooc ood oof ool ooo