-ol c-- ccc ccf ccl cco ccs cfc cff cfl cfo cfs cl- clc clf cll clo cls co- coc cof col coo cos csc csf csl cso css fcc fcf fcl fco fcs ffc fff ffl ffo ffs flc flf fll flo fls foc fof fol foo fos fsc fsf fsl fso fss lcc lcf lcl lco lcs lfc lff lfl lfo lfs llc llf lll llo lls loc lof lol loo los lsc lsf lsl lso lss oc- occ ocf ocl oco ocs of- ofc off ofl ofo ofs olc olf oll olo ols oo- ooc oof ool ooo oos os- osc osf osl oso oss scc scf scl sco scs sfc sff sfl sfo sfs slc slf sll slo sls soc sof sol soo sos ss- ssc ssf ssl sso sss