bbbb bbeb bbet bblb bebb bebe beeb beel beem beer beet bele bell belm belt belu beme bemu bere berm berr bert beru bete bett betu beur blbt bleb blee blem blet bleu blme blub blue blum blur blut breb bree brel brem brer bret brrm brrr brue brum brut btrt bttb bubb bube bubu buel buem buer bueu bulb bule bull bult bulu bum- bumb bur- burb bure burl burm burr burt buru but- bute butt ebbr ebel eber ebru ebul ebur eeee eele eete eetu el-b elbe elbu elee elem eler elet elle ellu elme elml elte elue elul elum embe embr emel emer emet emeu emle emlm emme emml emmu emre emte emul erbb erbe ereb erel erem erer eret erle erll erme erre ertl ertu erub erum erur etbr etee etel etem eter etre etrm ette ettu euer eule eur- eure eurt lblr lbrt le-u lebu leel leem leer leet lele lell lelu leme lemm lemu lere lerm lert lete lett leur llet lleu llll lmmr lrmt lrrr ltbl ltee lttr lube luer lule lull lulu lumb lume lure lurt lute mebe meel meem meer meet mel- melb mele mell melt meme meml memr memu mer- merb mere merl merm mert meru met- mete mett metu meum mlle mltb mltr mmmm mrbb mrbm mreb mree mrml mrtm mrtt mtel mtlb mtle mtre mtrl mtrr mttr mube muee muel muet mule mull mulm mult mulu mume mumm mumu mure murl murr murt muru mute mutt mutu muut rbbb rbbr rble rebb rebe rebu reeb reel reem reet relb rele rell relm relt reme rere rert reru rete retr rett reue reul reut reuu rlee rleu rlml rmll rmtu rrle rrrr rrum rtee rtle rtlt rtml rubb rube rubu ruel ruer ruet rule rull rumb rume ruml rumm rumt rure ruru rute rutl rutt rutu tbrb tebu teel teem teer teet tel- tele tell telt telu teme temu ter- tere term terr teru tete tetr tett tetu teut tmbr tmtt tre- tree trem tret treu trmb trml trmu trte trtr trub true trut truu ttbb tter ttml tttt ttul tubb tube tubr tubu tuel tuer tuet tule tull tulu tumb tume tumu turb ture turm turr turt turu tute tutl tutt tutu tuum ubbe uber ubet uble uele uell uleb ulee ulle ullr ulme ulmu ultt ulul ulum umb- umbe umer umet umut urbe ure- uret urle urre urte urum urur urut utel uter utmb uttu uulu uuuu