-ene -one cccc ccee cche ccnc ccne ccoc cec- cece ceco ceec cen- cene ceno cexe chce chch chec chee cheh chen chex chnc chno choc choh chon choo cnco cnex cnoh coce coch coco coen coex cohn coho con- conc cone conn cono cooh coon coxe cxxx eccc ecce ecco eche echo ecne eco- econ eeee eeoc ehcc eheh ehen ence ench enco enee eneo ennc enne eno- enoc enoe enon eone exch exco exec exen exh- exo- exon hccc hcch hech hehe hehn heho hene henh henn heno hex- hexe hhex hhhh hnce hoce hoch hocn hoen hohe hohn hoho hone hono hooe hoon hoox nccc nccn ncec ncee ncen nchc ncnc ncoc necc nece nech neco neen nehe nene nenh neno neo- neoc neon neoo neox nexe nexo nexx nhcc nhnn nhon nnnn noce noch noco nohn noho non- none nonn nono nonx noo- noon nooo o-eo occc occn oce ocee oche ocon oec- oecc oeec oen- oeno ohcc ohee ohen ohho ohne ohno ohoh onc- once onco one- onec onee oneh oneo onex onne onno onon ooho oone oooh oooo oxen oxo- oxon oxox oxxo xcon xen- xene xenn xeno xeon xexe xnee xoco xoxo xxxo xxxx