-ene cccc cccu ccee ccnc ccne ccnr ccnu ccrc ccre ccuc cec- cece ceec cen- cene cer- cerc cere cern cnrc cnrr crcc crce crcr cre- crec cree cren creu crne crue crun cucc cuce cucn cuer cune cure curn curr eccc ecce ecne ecrc ecrr ecru eeee eerc ence enee ener ennc enne ennu enue enur ercc erce erec eren erer erne errc erre eruc erur euer eur- eurc eure nccc nccn nccr nccu ncec ncee ncen ncer ncnc ncrc ncre ncue necc nece necr neen neer nene nenu nerc nere nerr neru neuc neue neun neur neuu nnnn nren nrrc nuce nucu nuee nuer nunc nune nunn nurc nure nurn nurr nuru rccc rcnr recc rece recr recu reen rene renn renu rere reru reue reuu rrrr rrun ruce ruen ruer runc rune runn rurc rure ruru ruun ucrc uncc unce unec unee unen uner unne ure- urne urre urun urur uuen uuuu