-ene -one cccc cccv ccee ccnc ccne ccoc ccvo cec- cece ceco ceec cen- cene ceno cevo cexe cnco cnex coce coco coen coex con- conc cone conn cono conv coon cove covo coxe cvcc cven cxxv cxxx eccc ecce ecco ecne eco- econ eeee eeoc eevn en-v ence enco enee eneo ennc enne eno- enoc enoe enon eone even evex evoe evon evoo exco exec exen exo- exon nccc nccn ncec ncee ncen ncnc ncoc necc nece neco neen neev nene neno neo- neoc neon neoo neox neve nevo nexe nexo nexx nnnn noce noco non- none nonn nono nonx noo- noon nooo noov nov- nove novo nvcc o-eo occc occn oce ocee ocon oec- oecc oeec oen- oeno onc- once onco one- onec onee oneo onex onne onno onon oone oooo ovee oven ovo- ovon ovoo oxen oxo- oxon oxox oxxo vcon vecc veen ven- vene venn veno veve vevo vexx voce vone vonn vooc voxx vvvv xcon xen- xene xenn xeno xeon xexe xnee xoco xove xoxo xxvc xxxo xxxv xxxx