-ol c-- ccc ccd ccl cco ccs cdc cdd cdl cdo cds cl- clc cld cll clo cls co- coc cod col coo cos csc csd csl cso css dcc dcd dcl dco dcs ddc ddd ddl ddo dds dl- dlc dld dll dlo dls doc dod dol doo dos dsc dsd dsl dso dss lcc lcd lcl lco lcs ldc ldd ldl ldo lds llc lld lll llo lls loc lod lol loo los lsc lsd lsl lso lss oc- occ ocd ocl oco ocs odc odd odl odo ods olc old oll olo ols oo- ooc ood ool ooo oos os- osc osd osl oso oss scc scd scl sco scs sdc sdd sdl sdo sds slc sld sll slo sls soc sod sol soo sos ss- ssc ssd ssl sso sss