-ene bbbb bbeb bbrc bcbc bccc bcec bcer bcnu bcru bcuc bebb bebe becu beeb been beer bene benn benu berc bere bern berr beru beur bner bnrr brcb brce breb brec bree bren brer brrr bruc brue brun bubb bube bubu bucc buce bucu buen buer bueu bunb bune bunn bunu bur- burb bure burn burr buru cbbc cbcc cbce cbcn cbcr cbcu cbec cbee cber cbre cbrn ccbc ccbn cccb cccc cccu ccee ccnb ccnc ccne ccnr ccnu ccrc ccre ccuc cebu cec- cece ceeb ceec cen- cene cer- cerc cere cern cnbc cnrc cnrr crbc crbu crcc crce crcr cre- creb crec cree cren creu crne crub crue crun cub- cubb cube cucc cuce cucn cuer cune curb cure curn curr ebbc ebbr ebcc eben eber ebru ebur ecbc ecbe eccb eccc ecce ecne ecrc ecrr ecru eeee eerc enb- enbn enbr ence enee ener ennc enne ennu enue enur erbb erbe ercc erce ereb erec eren erer erne errc erre erub eruc erur eubc euer eur- eurc eure nbbc nbcc nber ncbc nccc nccn nccr nccu ncec ncee ncen ncer ncnc ncrc ncre ncue nebb nebe nebn nebr nebu necc nece necr neeb neen neer nene nenu nerc nere nerr neru neuc neue neun neur neuu nnnn nren nrrc nubc nube nuce nucu nuee nuer nunc nune nunn nurc nure nurn nurr nuru rbbb rbbr rcbc rccb rccc rcnr rebb rebe rebu recc rece recr recu reeb reen rene renn renu rere reru reue reuu rnbr rrrr rrun rubb rube rubu ruce ruen ruer runc rune runn rurc rure ruru ruun ubbe uber ucbc ucrc unbe uncc unce uneb unec unee unen uner unne urbe ure- urne urre urun urur uuen uuuu