-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 cexe cnet cnex cnrc cnrr cnrt cntc cntr crcc crce crcr cre- crec cree cren cret crex crne crrt crtc ctec cten ctne ctrc ctrn cttn cxxx eccc ecce ecct ecne ecrc ecrr ect- ectc eeee eent eerc eetc eete eext ence enee ener ennc enne ent- ente entr er-x ercc erce erec eren erer eret erne errc erre etcc etec etee eten eter etne etnr etre ette ettn exec exen exer exrx exte extr 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 nexe next nexx 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 rexx rnnt rrrr rtcc rtce rtee rtex tccc tcnn tctc tecr tect teec teen teer teet tenc tene tenn tent ter- terc tere tern terr tete tetr tett tetx text tncc trcc tre- trec tree tren tret trex trtc trte trtr ttcn tten tter tttt txcn txen txtr xeer xen- xene xenn xer- xert xexe xnee xnet xxxx