-ene cccc ccee ccnc ccne ccnr ccrc ccre cec- cece ceec ceke cen- cene cer- cerc cere cern ckck cken cker cknc ckrc cnrc cnrr crcc crce crcr cre- crec cree cren crkc crne eccc ecce ecne ecrc ecrr eeee eeke eerc ekek eken eker ekne ence enee ener enke enkr ennc enne ercc erce erec eren erer erke erne errc erre kccc kcck kccr kcec kcee kckc kckk kckn kckr kcnr kcrc kcrn kcrr keck kecr keek keen keer kekc keke ken- kene kenk kenn kenr ker- kerc kere kerk kern kerr kkck kkcn kkcr kken kkkk kkne kknn kkrc kkre kkrk kkrn kkrr knce knck kncn kncr knec knee knek knen knkk knnk knnr knrk krcc krce krcn krec kree krek kren krkc krke krkk krkn krkr krne krnk krnn krrc krre krrk krrn krrr nccc nccn nccr ncec ncee ncen ncer ncnc ncrc ncre necc nece neck necr neen neer neke nene nerc nere nerk nerr nnnn nren nrrc rccc rcnr recc rece reck recr reek reen reke rene renk renn rere rrrr