-ol c-- ccc ccf ccl cco ccs cct cfc cff cfl cfo cfs cft cl- clc clf cll clo cls clt co- coc cof col coo cos cot csc csf csl cso css cst ctc ctf ctl cto cts ctt fcc fcf fcl fco fcs fct ffc fff ffl ffo ffs fft flc flf fll flo fls flt foc fof fol foo fos fot fsc fsf fsl fso fss fst ftc ftf ftl fto fts ftt lcc lcf lcl lco lcs lct lfc lff lfl lfo lfs lft llc llf lll llo lls llt loc lof lol loo los lot lsc lsf lsl lso lss lst ltc ltf ltl lto lts ltt oc- occ ocf ocl oco ocs oct of- ofc off ofl ofo ofs oft olc olf oll olo ols olt oo- ooc oof ool ooo oos oot os- osc osf osl oso oss ost ot- otc otf otl oto ots ott scc scf scl sco scs sct sfc sff sfl sfo sfs sft slc slf sll slo sls slt soc sof sol soo sos sot ss- ssc ssf ssl sso sss sst stc stf stl sto sts stt tcc tcf tcl tco tcs tct tfc tff tfl tfo tfs tft tlc tlf tll tlo tls tlt to- toc tof tol too tos tot tsc tsf tsl tso tss tst ttc ttf ttl tto tts ttt