-tree bbbee be-er be-ro bebel beber beblo bebot beebe beele beete belbo belee belet bellb belle bello belot beote berbe berel beret berle berlo berob beroe berol beror berre berte berto betee betel beter betle betoo betor betre bett- bette betto bleer bleet blere blete bloor blorb blore blort blote bloto blott bo-bo bobet boble bobr bobre boeol boero bolbe bolel boleo boler bolet boll- bolle bollo bolte bolto booer boole boore boort borbo boree borel borer boret borle boro- boroo borot borre borro botel botet botro botte breel breer breet brell brelo breo- brere breto brett brobo broer brole broll brolo brool broto brrrr btr-t ebber ebbet ebble ebell ebelo eberl ebert eeeee eeler elbot eleet elele eleo- eleot ellel eller ellet elloe eloee elole eloor elore eloro elote elrob eltro eorre erbbe erber erere eroor erore eroto errol error erte ertel erter etete etoll etool etoro etree ettel etter ettle lebel leber lebet leell leere leert lelle lerer lerot letbe letot letre lette letto lobbe lobbo lober loble lobo- lobor loler lollo lolol looer loore loote lorel loreo lorer loret lorre lotor lotte lotto o-r-b obbet obele obert obete obole obolo oboro obote obreb oelet oerel oerle oleo- olere olleo oller oltet oltre oo-er ooooo orble orbot orell oreo- orere orero orlet orobe orobo oroer orret orter ortet ortoo otell otelo otere otero otole otolo ototo otter rebbe rebel reber rebet rebol reere relee relet rello relot relte rere- reree reret rerob retee retel reter retro rette retto ro-ro robbe robbo rober roble robo- robor robot robrt robte roell roero roleo rolle rollo rooer roole roore roote rorer roteb rotel roter rotle roto- rotol rotor rotot rotte rotto tbolt tbtbt teber tebet teele teell tele- teleo teler tell- telle tello telo- teolo teotl teret teror terre terro tert- tetel teter tetle tetr- tetro tette tlell tlett tllbr to-be tobbe tobel tober tobet tobol tobor tobot tobre toerr toeto tolbo toler tolet tolle tollo toloo tolor toobe toole toolt toore torbe torel toreo toret torob torre torro torte torto totel toter totle toto- totoe totoo totte treer treet trele trere trete trett troee troll trott ttttt