-ene -yne cccc cccf ccee ccfc ccff ccnc ccne ccnf ccnr ccny ccrc ccre ccrf cec- cece ceec cef- cefc cefn cen- cene ceny cer- cerc cere cerf cern cery cfcf cfcn cfcy cffr cfnr cfre cfrn cfry cfyn cnrc cnrr crcc crce crcr cre- crec cree cren crfc crne cry- cryn cyc- cycc cyen cyfe cyn- cyne cyre cyy- cyyc cyyn eccc ecce ecef ecfc ecfr ecne ecrc ecrf ecrr eeee eefe eefn eeny eerc eery efen effy ence ency enee ener eney ennc enne enny enry enye ercc erce erec eren erer erfc erne errc erre eryc erye eyec eyen eyer eyey eyne eyre eyry eyyr fccf fece feen feer fefc fefe feff fene fenn feny ferc fere fern ferr fery feyn feyr ffcc ffee ffff ffrr frcc frcn free fren frey frfc frye fyce fyen fyfe fyne fynn fyre fyry nccc nccf nccn nccr ncec ncee ncef ncen ncer ncfc ncfe ncnc ncrc ncre necc nece necr necy neef neen neer nefe neff nene nerc nere nerf nerr nery neye neyf neyn nfer nfff nfyc nnnn nren nrfc nrrc nycc nyce nycy nyen nyer nyne nyny nyrf rccc rcfc rcnr rcyc recc rece recr recy reef reen refe reff refn refr rene renn reny rere rery reye reyn rfef rffc rrfc rrrr ryen ryfe ryff ryne rynn ryyf yccc ycee yeen yeer yefe yeff yenc yene yere yern yerr yery yeye yeyr ynce ynne yren yrne yryn yyfe yyff yyyy