-ol c-- ccc ccf ccl cco cct cfc cff cfl cfo cft cl- clc clf cll clo clt co- coc cof col coo cot ctc ctf ctl cto ctt fcc fcf fcl fco fct ffc fff ffl ffo fft flc flf fll flo flt foc fof fol foo fot ftc ftf ftl fto ftt lcc lcf lcl lco lct lfc lff lfl lfo lft llc llf lll llo llt loc lof lol loo lot ltc ltf ltl lto ltt oc- occ ocf ocl oco oct of- ofc off ofl ofo oft olc olf oll olo olt oo- ooc oof ool ooo oot ot- otc otf otl oto ott tcc tcf tcl tco tct tfc tff tfl tfo tft tlc tlf tll tlo tlt to- toc tof tol too tot ttc ttf ttl tto ttt