-ene -yne cccc ccee ccnc ccne ccnr ccny ccrc ccre cec- cece ceec cen- cene ceny cer- cerc cere cern cery cnrc cnrr crcc crce crcr cre- crec cree cren crne cry- cryn cyc- cycc cyen cyn- cyne cyre cyy- cyyc cyyn eccc ecce ecne ecrc ecrr eeee eeny eerc eery ence ency enee ener eney ennc enne enny enry enye ercc erce erec eren erer erne errc erre eryc erye eyec eyen eyer eyey eyne eyre eyry eyyr nccc nccn nccr ncec ncee ncen ncer ncnc ncrc ncre necc nece necr necy neen neer nene nerc nere nerr nery neye neyn nnnn nren nrrc nycc nyce nycy nyen nyer nyne nyny rccc rcnr rcyc recc rece recr recy reen rene renn reny rere rery reye reyn rrrr ryen ryne rynn yccc ycee yeen yeer yenc yene yere yern yerr yery yeye yeyr ynce ynne yren yrne yryn yyyy