-ene bbbb bbdd bbeb bbet bd-r bebb bebe bede bedu beeb beed been beer beet bend bene benn bent benu berd bere bern berr bert beru bete bett betu beur bner bnet bnrr brdt breb bred bree bren brer bret brrr brud brue brun brut btdt bten btrt bttb bubb bube bubu budb budd bude budu buen buer bueu bunb bund bune bunn bunt bunu bur- burb burd bure burn burr burt buru but- bute butt dbrn dbtt dddd ddre ddub debe debt debu dedd dede dedu deeb deed deen deer deet dene denn dent denu der- derb dere dern derr dete detn detr deue deur deut dner dnet dntt dnut dred dree dren dret drub drue drut druu dted dten dtnb dub- dubb dube dubu dudd dude dudu duer duet dune dunn dunt dure durn durt duru dute duur duut ebbr ebed eben eber ebru ebur edde ede- eden eder edrn edru edun edur eede eedu eeee eend eent eete eetu enb- enbn enbr end- ende endu ened enee ener enne ennu ent- entd ente entr enue enur enut erbb erbe erde ereb ered eren erer eret erne erre ertu erub erur etbr etee eten eter etne etnr etre ette ettn ettu etun eude euer eur- eure eurt nber nddb ndde nder ndnt ndre ndut nebb nebe nebn nebr nebu nedd nede nedu neeb need neen neer neet nend nene nent nenu nerd nere nerr nert neru net- netb netd nete nett neue neun neur neut neuu nndb nnnn nntn nren nrrd nter nteu ntnd ntnu ntru nttr nube nudd nude nuee nuer nune nunn nunt nurd nure nurn nurr nurt nuru nute nutt nutu rbbb rbbr rder rebb rebe rebu redd rede redr redu reeb reed reen reet rend rene renn rent renu rerd rere rert reru retd rete retr rett reue reut reuu rnbr rnnt rntd rnut rred rrrr rrun rtdt rtee rtnd rubb rube rubu rudd rude rued ruen ruer ruet rund rune runn runt rurd rure ruru rute rutt rutu ruud ruun tbrb tddb tebu tedd tede teed teen teer teet tenb tend tene tenn tent tenu ter- tere tern terr teru tete tetr tett tetu teut tndd tneb tnut tre- tred tree tren tret treu trte trtr trub trud true trun trut truu ttbb tten tter tttt tubb tube tubr tubu tude tudu tuen tuer tuet tunb tund tune tunn tunu turb turd ture turn turr turt turu tute tutt tutu ubbe uber ubet ubud uden uder udet udun uend unbd unbe unde uneb uned unee unen uner unne untb unte unut urbe urde urdu ure- ured uret urne urre urte urun urur urut uter utne uttu uuen uuuu