bbbb bbdd bbeb bbet bbpr bd-r bebb bebe bede bedu beeb beed beep beer beet berd bere berr bert beru bete bett betu beur bprd brdt breb bred bree brep brer bret brrr brud brue brup brut btbp btdt btrt bttb bubb bube bubu budb budd bude budu buer bueu bur- burb burd bure burp burr burt buru but- bute butt dbpd dbtt dddd ddre ddub debe debt debu dedd dede dedu deeb deed deep deer deet depe depp depr dept der- derb dere derp derr dete detr deue deur deut dpdt dper dred dree dret drub drue drup drut druu dtdp dted dttp dub- dubb dube dubu dudd dude dudu duer duet dupe dure durt duru dute dutp duur duut ebbr ebed eber ebru ebur edde eddp ede- eder edru edup edur eede eedu eeee eete eetu epee eper eppp eprb eprp epte epub erbb erbe erde ereb ered erer eret erpe erre ertu erub erur etbr etee eter etre ette ettu eude euer eur- eure eurt pbed pdpr ped- pede peed peep peer peet pepd pepe per- perd pere perp perr pert peru pete petr pett peur peut pper pppd pppp ppru pptt ppur pre- preb pred pree prep pret preu prpd prrd prtp prtr prud prue prut pruu pter ptpd ptrd pu-e pube pubu pudu pued puer puet pueu pupe pupu pur- purb pure purp purr puru put- pute putt putu rbbb rbbr rdbp rder rebb rebe rebu redd rede redr redu reeb reed reep reet repe repp repr rept repu rerd rere rert reru retd rete retr rett reue reup reut reuu rpdp rpet rptd rred rrrr rtdt rtee rttp rubb rube rubp rubu rudd rude rudp rued ruer ruet rupe rupp rupt rurd rure rurp ruru rute rutt rutu ruud tbrb tbtp tddb tebu tedd tede teed teer teet tepe tepp tepu ter- tere terp terr teru tete tetr tett tetu teut tpdu tped tper tppd tppp tppr tpte tptp tptr tput tre- tred tree tret treu trpe trpp trte trtr trub trud true trut truu ttbb tter tttt tubb tube tubr tubu tude tudu tuer tuet tupe tupu turb turd ture turp turr turt turu tute tutt tutu u-rp ubbe uber ubet ubud uder udet udpd upbe uped uppe uppp uppu upup urbe urde urdu ure- ured uret urre urte urup urur urut utep uter utpd uttu uuuu