-ol c-- ccc ccd cce ccl cco ccs cdc cdd cde cdl cdo cds ce- cec ced cee cel ceo ces cl- clc cld cle cll clo cls co- coc cod coe col coo cos csc csd cse csl cso css dcc dcd dce dcl dco dcs ddc ddd dde ddl ddo dds de- dec ded dee del deo des dl- dlc dld dle dll dlo dls doc dod doe dol doo dos dsc dsd dse dsl dso dss ec- ecc ecd ece ecl eco ecs ed- edc edd ede edl edo eds eec eed eee eel eeo ees elc eld ele ell elo els eo- eoc eod eoe eol eoo eos es- esc esd ese esl eso ess lcc lcd lce lcl lco lcs ldc ldd lde ldl ldo lds lec led lee lel leo les llc lld lle lll llo lls loc lod loe lol loo los lsc lsd lse lsl lso lss oc- occ ocd ocl oco ocs odc odd ode odl odo ods oec oed oee oel oeo oes olc old ole oll olo ols oo- ooc ood ool ooo oos os- osc osd ose osl oso oss scc scd sce scl sco scs sdc sdd sde sdl sdo sds se- sec sed see sel seo ses slc sld sle sll slo sls soc sod soe sol soo sos ss- ssc ssd sse ssl sso sss