bbbb bbeb bbet bblb bebb bebe bebo beeb beel beer beet bele bell belo belt beo- beor beot bere bero berr bert bete beto bett blbt bleb blee bleo blet blob bloo blot bobb bobe bobo boee boel boeo boer boet bole boll bolo bolt boob booe bool boor boot bor- bore boro borr bort botb bote boto bott breb bree brel breo brer bret brob broe brol broo bror brot brrr btob btor btrt bttb ebbo ebbr ebel eber eboe ebol eboo ebor ebro eeee eele eero eete el-b elbe elbo elee eleo eler elet elle ello elro elte elto eole eolo eore eorl eoto erbb erbe ereb erel erer eret erle erll erob eroe erol eroo erre erro ertl etbr etee etel eter etoe etre etro ette etto lblr lbrt lebo leel leer leet lele lell lelo leor lere lero lert lete leto lett llet llll lloo lob- lobb lobe lobo loeb lole loll lolo loob looe lool loor loot lore loro lote lotl loto lotr lott lrrr ltbl ltee lttr o-eo obbo obel ober obet oble oboe obol obor obot obre obro oele oere olbo ole- oleo oler olet olle ollo olor olot oobe ooer oolo oooo oore oort ootb orbb orbe orbo ore- oreb orel oreo orer orle orlo oro- oroe oror orot orro orte orto otee oter oto- otoe otoo otor otre otro otte otto rbbb rbbr rble rebb rebe rebo reeb reel reet relb rele rell relo relt reol reot rere rero rert rete reto retr rett rlee rob- robb robe robo robt roel roer roet role roll rolo rolt roob rool roor root rore roro rort rote rotl roto rotr rott rrle rrrr rtee rtle rtlt tbrb tebo teel teer teet tel- tele tell telo telt teor ter- tere tero terr tete teto tetr tett tobe tobo tobt toee toer toet tol- tole toll tolo tolt tool toor toot tore toro torr tort tote toto totr tott tre- tree treo tret troe troo trot trte trtr ttbb tteo tter ttoe tttt