-ene cccc ccee ccnc ccne ccnr ccrc ccre ccrt cctc cctt cec- cece cect ceec cen- cene cent cer- cerc cere cern cert cet- cete cnet cnrc cnrr cnrt cntc cntr crcc crce crcr cre- crec cree cren cret crne crrt crtc ctec cten ctne ctrc ctrn cttn eccc ecce ecct ecne ecrc ecrr ect- ectc eeee eent eerc eetc eete ence enee ener ennc enne ent- ente entr ercc erce erec eren erer eret erne errc erre etcc etec etee eten eter etne etnr etre ette ettn nccc nccn nccr ncct ncec ncee ncen ncer ncnc ncrc ncre nctc ncte nctr necc nece necr nect neen neer neet nene nent nerc nere nerr nert net- nete nett nnnn nntn nren nrrc ntcc nter ntrc nttr rccc rcet rcnr rctc recc rece recr rect reen reet rene renn rent rere rert rete retr rett rnnt rrrr rtcc rtce rtee tccc tcnn tctc tecr tect teec teen teer teet tenc tene tenn tent ter- terc tere tern terr tete tetr tett tncc trcc tre- trec tree tren tret trtc trte trtr ttcn tten tter tttt