-ene -one -yne cccc ccee ccnc ccne ccny ccoc cec- cece ceco ceec cen- cene ceno ceny cexe ceyx cnco cnex coce coco coen coex con- conc cone conn cono cony coon coxe coxy coyn coyo cxxx cyc- cycc cyen cyn- cyne cyno cyon cyy- cyyc cyyn eccc ecce ecco ecne eco- econ eeee eeny eeoc ence enco ency enee eneo eney ennc enne enny eno- enoc enoe enon enoy enye enyo eone exco exec exen exo- exon exxy eyec eyen eyey eyne nccc nccn ncec ncee ncen ncnc ncoc necc nece neco necy neen nene neno neo- neoc neon neoo neox nexe nexo nexx neye neyn neyo nnnn noce noco non- none nonn nono nonx noo- noon nooo noye noyo nycc nyce nyco nycy nyen nyne nyny nyon o-eo occc occn oce ocee ocon oec- oecc oeec oen- oeno oeye oeyo onc- once onco one- onec onee oneo onex oney onne onno onon onoy onyx oone oooo oxen oxo- oxon oxox oxxo oxy- oxyn oyce oyee oyen oyne oyon xcon xen- xene xenn xeno xeon xexe xnee xoco xoxo xoyo xxxo xxxx xxxy xyne yccc ycee yeen yenc yene yeon yeox yeye yeyo ynce ynne ynon yoen yone yono yoon yoxe yoye yoyn yoyo yyyy