-ene -one cccc cccp ccee ccnc ccne ccnp ccoc ccpe ccpn ccpp cec- cece ceco cecp ceec cen- cene ceno ceop cepc cepe cepo cepp cexe cnco cncp cnep cnex coce coco cocp coen coep coex con- conc cone conn cono coon coop cope copo copp coxe cpce cpep cpox cxpo cxxx eccc ecce ecco ecne eco- econ ecop ecpp eeee eeoc ence enco enee eneo ennc enne eno- enoc enoe enon enp- eone epcc epec epee epen epoc epon epox eppc eppo eppp epxp exco exec exen exo- exon expn expo nccc nccn nccp ncec ncee ncen ncep ncnc ncoc ncpc necc nece neco neen neep nene neno neo- neoc neon neoo neox nepc nepe nexe nexo nexx nnnn noce noco non- none nonn nono nonx noo- noon nooo noop nope npcc nppc o-eo occc occn oce ocee ocon ocpp oec- oecc oeec oen- oeno onc- once onco one- onec onee oneo onep onex onne onno onon oone oooo opec open opep opex opo- opon oppo oxen oxep oxo- oxon oxox oxxo pccc pcce pcep pcnx pcoe pcpn pcpp pece peco peec peen peep pen- penc pene penn peno peon pepe pepo pnec pnon pnpo pnpp poce poco ponc pone pono ponp poon poop pop- popc pope popo popp ppcc ppen pppn pppo pppp xcon xen- xene xenn xeno xeon xexe xnee xoco xoxo xpcc xxxo xxxx