-ene -one cccc cccp cccv ccee ccnc ccne ccnp ccoc ccpe ccpn ccpp ccvo cec- cece ceco cecp ceec cen- cene ceno ceop cepc cepe cepo cepp cevo cnco cncp cnep coce coco cocp coen coep con- conc cone conn cono conv coon coop cope copo copp cove covo cpce cpep cpvc cvcc cven eccc ecce ecco ecne eco- econ ecop ecpp eeee eeoc eevn en-v ence enco enee eneo ennc enne eno- enoc enoe enon enp- eone epcc epec epee epen epoc epon eppc eppo eppp even evoe evon evoo evop nccc nccn nccp ncec ncee ncen ncep ncnc ncoc ncpc necc nece neco neen neep neev nene neno neo- neoc neon neoo nepc nepe neve nevo nnnn noce noco non- none nonn nono noo- noon nooo noop noov nope nov- nove novo npcc npov nppc nvcc o-eo occc occn oce ocee ocon ocpp oec- oecc oeec oen- oeno oevp onc- once onco one- onec onee oneo onep onne onno onon oone oooo opec open opep opo- opon oppo ovee oven ovo- ovon ovoo ovpp pccc pcce pcep pcoe pcpn pcpp pece peco peec peen peep peev 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 povo ppcc ppen pppn pppo pppp pvco vcon vecc veen veep ven- vene venn veno vepe veve vevo voce vone vonn vooc vpon vvvv