-ene cccc cccf cccp ccee ccfc ccff ccnc ccne ccnf ccnp ccnr ccpe ccpn ccpp ccpr ccrc ccre ccrf ccrp cec- cece cecp ceec cef- cefc cefn cen- cene cepc cepe cepp cepr cer- cerc cere cerf cern cerp cfcf cfcn cffr cfnr cfpr cfre cfrn cfrp cncp cnep cnrc cnrr cpce cpep cper cpff cpre crcc crce crcr cre- crec cree cren crep crfc crne crpc eccc ecce ecef ecfc ecfr ecne ecpp ecrc ecrf ecrr eeee eefe eefn eerc efen ence enee ener enfp ennc enne enp- epcc epec epee epen eper epfc eppc eppp eprp ercc erce ercp erec eren erer erfc erne erpe errc erre fccf fccp fece feen feer fefc fefe feff fene fenn fepc ferc fere fern ferr ffcc ffee ffff ffrr fp-c fpcc fprf frcc frcn frcp free fren frep frfc nccc nccf nccn nccp nccr ncec ncee ncef ncen ncep ncer ncfc ncfe ncnc ncpc ncrc ncre ncrp necc nece necr neef neen neep neer nefe neff nene nepc nepe nepr nerc nere nerf nerr nfer nfff nnnn nnpr npcc nppc nren nrfc nrpc nrpn nrrc pccc pcce pcep pcer pcfc pcpn pcpp pcrc pcre pcrf pece pecr peec peen peep peer pefc peff pen- penc pene penn pepe per- perc pere perf pern perp perr pfce pfff pffr pnec pnpp ppcc ppen pper pppn pppp pprc pprf prcc prcf prcp pre- prec pree pref pren prep prfc prnp rccc rcep rcfc rcnr recc rece recp recr reef reen reep refe reff refn refr rene renn repe repp repr rere rfef rffc rncp rpfc rppn rrfc rrrr