-ene -one cccc cccp ccee ccnc ccne ccnp ccnr ccoc ccpe ccpn ccpp ccpr ccrc ccre ccrp cec- cece ceco cecp ceec cen- cene ceno ceop ceor cepc cepe cepo cepp cepr cer- cerc cere cern cero cerp cnco cncp cnep cnrc cnrr coce coco cocp coen coep con- conc cone conn cono coon coop cope copo copp copr cor- corc core corn coro corp corr cpce cpep cper cpre crcc crce crcr cre- crec cree cren creo crep crne croc croe cron croo crop cror crpc eccc ecce ecco ecne eco- econ ecop ecpp ecrc ecrr eeee eeoc eerc eero ence enco enee eneo ener ennc enne eno- enoc enoe enon enp- eone eore epcc epec epee epen eper epoc epon epor eppc eppo eppp epro eprp ercc erce ercp erec eren erer erne erno eroc eroe eron eroo erpe errc erre erro nccc nccn nccp nccr ncec ncee ncen ncep ncer ncnc ncoc ncor ncpc ncrc ncre ncrp necc nece neco necr neen neep neer nene neno neo- neoc neon neoo nepc nepe nepr nerc nere nero nerr nnnn nnpr noce noco noer non- none nonn nono noo- noon nooo noop noor nope nor- norc nore norn noro norr npcc nppc nren nroc nron nrpc nrpn nrrc o-eo occc occn oce ocee ocon ocpp ocre ocro ocrr oec- oecc oeec oen- oeno oere onc- once onco one- onec onee oneo onep oner onne onno onon onor oocr ooer oone oooo oore opec open opep oper opo- opon opor oppo orce orco ore- orec oren oreo orer ornc orne orno oro- oroe oron oror orpc orpe orro pccc pcce pcep pcer pcoe pcpn pcpp pcrc pcre pece peco pecr peec peen peep peer pen- penc pene penn peno peon peor pepe pepo per- perc pere pern pero perp perr pnec pnon pnpo pnpp pnro poce poco poer ponc pone pono ponp poon poop poor pop- popc pope popo popp porc pore porn poro porr ppcc ppen pper pppn pppo pppp pprc prcc prcp pre- prec pree pren prep prnp pro- proc proe pron proo prop rccc rcep rcnr rcon rcpo recc rece recp recr reen reep rene renn reno reop repe repo repp repr rere rero rnco rncp rocc roce roco roen roer ronc rone rono roon roop roor rope ropo rorc rore roro rpoe rpon rppn rrrr