-ene bbbb bbdd bbeb bd-r bebb bebe bede bedu beeb beed been beer bend bene benn benu berd bere bern berr beru beur bner bnrr breb bred bree bren brer brrr brud brue brun bubb bube bubu budb budd bude budu buen buer bueu bunb bund bune bunn bunu bur- burb burd bure burn burr buru dbrn dddd ddre ddub debe debu dedd dede dedu deeb deed deen deer dene denn denu der- derb dere dern derr deue deur dner dred dree dren drub drue druu dub- dubb dube dubu dudd dude dudu duer dune dunn dure durn duru duur ebbr ebed eben eber ebru ebur edde ede- eden eder edrn edru edun edur eede eedu eeee eend enb- enbn enbr end- ende endu ened enee ener enne ennu enue enur erbb erbe erde ereb ered eren erer erne erre erub erur eude euer eur- eure nber nddb ndde nder ndre nebb nebe nebn nebr nebu nedd nede nedu neeb need neen neer nend nene nenu nerd nere nerr neru neue neun neur neuu nndb nnnn nren nrrd nube nudd nude nuee nuer nune nunn nurd nure nurn nurr nuru rbbb rbbr rder rebb rebe rebu redd rede redr redu reeb reed reen rend rene renn renu rerd rere reru reue reuu rnbr rred rrrr rrun rubb rube rubu rudd rude rued ruen ruer rund rune runn rurd rure ruru ruud ruun ubbe uber ubud uden uder udun uend unbd unbe unde uneb uned unee unen uner unne urbe urde urdu ure- ured urne urre urun urur uuen uuuu