-ene -one cccc cccf ccee ccfc ccff ccnc ccne ccnf ccoc cec- cece ceco ceec cef- cefc cefn cen- cene ceno cfcf cfcn cfco cnco coce coco coen cofc cofe coff con- conc cone conf conn cono coof coon eccc ecce ecco ecef ecfc ecne eco- econ eeee eefe eefn eeoc efco efen efeo efon ence enco enee eneo ennc enne eno- enoc enoe enon eone fccf fece feen fefc fefe feff fefo fene fenn feof feon ffcc ffee ffff foce foco fofo fone fono foof foon nccc nccf nccn ncec ncee ncef ncen ncfc ncfe ncnc ncoc necc nece neco neef neen nefe neff nene neno neo- neoc neon neoo nfff nfon nnnn noce noco non- none nonn nono noo- noon nooo o-eo occc occn oce ocee ocef ocon oec- oecc oeec oen- oeno ofen off- offc offe offo ofno onc- once oncf onco one- onec onee oneo onne onno onon ooff oone oooo