-ene -one cccc cccf cccp ccee ccfc ccff ccnc ccne ccnf ccnp ccnr ccoc ccpe ccpn ccpp ccpr ccrc ccre ccrf ccrp cec- cece ceco cecp ceec cef- cefc cefn cen- cene ceno ceop ceor cepc cepe cepo cepp cepr cer- cerc cere cerf cern cero cerp cfcf cfcn cfco cffr cfnr cfor cfpo cfpr cfre cfrn cfrp cnco cncp cnep cnrc cnrr coce coco cocp coen coep cofc cofe coff con- conc cone conf conn cono coof coon coop cope copo copp copr cor- corc core corf corn coro corp corr cpce cpep cper cpff cpre crcc crce crcr cre- crec cree cren creo crep crfc crne croc croe cron croo crop cror crpc eccc ecce ecco ecef ecfc ecfr ecne eco- econ ecop ecpp ecrc ecrf ecrr eeee eefe eefn eeoc eerc eero efco efen efeo efon efor ence enco enee eneo ener enfp ennc enne eno- enoc enoe enon enp- eone eore epcc epec epee epen eper epfc epoc epon epor eppc eppo eppp epro eprp ercc erce ercp erec eren erer erfc erne erno eroc eroe eron eroo erpe errc erre erro fccf fccp fece feen feer fefc fefe feff fefo fene fenn feof feon fepc ferc fere fern fero ferr ffcc ffee ffff ffrr foce foco foer fofo fone fono foof foon fopp for- fore forn foro forr fp-c fpcc fprf frcc frcn frcp free fren freo frep frfc froe fron frop nccc nccf nccn nccp nccr ncec ncee ncef ncen ncep ncer ncfc ncfe ncnc ncoc ncor ncpc ncrc ncre ncrp necc nece neco necr neef neen neep neer nefe neff nene neno neo- neoc neon neoo nepc nepe nepr nerc nere nerf nero nerr nfer nfff nfon nnnn nnpr noce noco noer non- none nonn nono noo- noon nooo noop noor nope nor- norc nore norf norn noro norr npcc nppc nren nrfc nroc nron nrpc nrpn nrrc o-eo occc occn oce ocee ocef ocfp ocon ocpp ocre ocro ocrr oec- oecc oeec oen- oeno oere ofcr ofen ofer off- offc offe offo offr ofno ofor ofre onc- once oncf onco one- onec onee oneo onep oner onne onno onon onor oocr ooer ooff oone oooo oore opec open opep oper opo- opon opor oppo orce orco ore- orec oren oreo orer orfe orff ornc orne orno oro- oroe orof oron oror orpc orpe orro pccc pcce pcep pcer pcfc pcoe pcpn pcpp pcrc pcre pcrf pece peco pecr peec peen peep peer pefc peff pen- penc pene penn peno peon peor pepe pepo per- perc pere perf pern pero perp perr pfce pfff pffr pnec pnon pnpo pnpp pnro poce poco poer poff ponc pone pono ponp poof poon poop poor pop- popc pope popo popp porc pore porn poro porr ppcc ppen pper pppn pppo pppp pprc pprf prcc prcf prcp pre- prec pree pref pren prep prfc prnp pro- proc proe prof pron proo prop rccc rcep rcfc rcnr rcon rcpo recc rece recp recr reef reen reep refe reff refn refr rene renn reno reof reop repe repo repp repr rere rero rfef rffc rnco rncp rocc roce roco roen roer rofc rofe roff rofo ronc rone rono roof roon roop roor rope ropo rorc rore roro rpfc rpoe rpof rpon rppn rrfc rrrr