-ol c-- ccc ccd ccf ccl cco cct cdc cdd cdf cdl cdo cdt cfc cfd cff cfl cfo cft cl- clc cld clf cll clo clt co- coc cod cof col coo cot ctc ctd ctf ctl cto ctt dcc dcd dcf dcl dco dct ddc ddd ddf ddl ddo ddt dfc dfd dff dfl dfo dft dl- dlc dld dlf dll dlo dlt doc dod dof dol doo dot dtc dtd dtf dtl dto dtt fcc fcd fcf fcl fco fct fdc fdd fdf fdl fdo fdt ffc ffd fff ffl ffo fft flc fld flf fll flo flt foc fof fol foo fot ftc ftd ftf ftl fto ftt lcc lcd lcf lcl lco lct ldc ldd ldf ldl ldo ldt lfc lfd lff lfl lfo lft llc lld llf lll llo llt loc lod lof lol loo lot ltc ltd ltf ltl lto ltt oc- occ ocd ocf ocl oco oct odc odd odf odl odo odt of- ofc ofd off ofl ofo oft olc old olf oll olo olt oo- ooc ood oof ool ooo oot ot- otc otd otf otl oto ott tcc tcd tcf tcl tco tct tdc tdd tdf tdl tdo tdt tfc tfd tff tfl tfo tft tlc tld tlf tll tlo tlt to- toc tod tof tol too tot ttc ttd ttf ttl tto ttt