-ene cccc cccf ccee ccfc ccff cche cchr ccnc ccne ccnf ccnr ccrc ccre ccrf cec- cece ceec cef- cefc cefn cen- cene cer- cerc cere cerf cern cfcf cfcn cffr cfnr cfre cfrn chce chch chec chee chef cheh chen cher chfc chfr chnc chnr chrc chrf chrn chrr cnrc cnrr crcc crce crcr cre- crec cree creh cren crfc crne eccc ecce ecef ecfc ecfr eche ecne ecrc ecrf ecrr eeee eefe eefn eerc efen ehcc eheh ehen eher ehre ence ench enee ener ennc enne ercc erce erch erec eren erer erfc erhc erne errc erre fccf fcch fece fech feen feer fefc fefe feff fehr fene fenn ferc fere fern ferr ffcc ffee ffff ffrr frcc frcn free fren frfc hccc hcch hcfc hech heef heer hefe hehe hehn hene henh henn herc here hern herr hfce hhhh hnce hree hrfc hrrc nccc nccf nccn nccr ncec ncee ncef ncen ncer ncfc ncfe nchc ncnc ncrc ncre necc nece nech necr neef neen neer nefe neff nefh nehe nene nenh nerc nere nerf nerr nfer nfff nhcc nhnn nhrc nnnn nren nrfc nrrc rccc rcfc rcnr recc rece rech recr reef reen refe reff refn refr rehe rehn rene renn rere rfef rffc rhce rhee rhen rrfc rrrr