-tree bbbee be-er be-ro beber bebop bebot beebe beete beote bepop beppe beppo berbe beret berob beroe beror berre berte berto betee beter betoo betor betre bett- bette betto bo-bo bobet bobr bobre boero booer boore boort bopet borbo boree borer boret boro- boroo borot borre borro botet botro botte breer breet breo- brere breto brett brobo broer broto brrrr btr-t e-pro ebber ebbet ebert eeeee eepee eorre epopt epote epptb erbbe erber erept erere eroor erore eroto error erte erter etete etoro etree etter o-r-b obbet obert obete oboro obote obreb oeppo oo-er ooooo opepe opere opobo opper opter opto- optot optto orbot oreo- orere orero orobe orobo oroer orret orter ortet ortoo otere otero ototo otpor otter p-rep pebre peebo peere peert peete pepee peppe pept- pepto perer peret perot perre perro perte perto petbe peter petr- petre petro pette petto po-po pobe poete pooer poope poopo poore poort poote poper popet popop poppe poppo poreb porer poret poro- porro porte porto poteb potee poter potoo potop potor potpe potro potte potto preop prete preto probe probo proer proor proot prop- prope propp propr propt prore prot- proto prtor pter- ptere ptero ptprb ptpre ptpro ptprr ptprt rebbe reber rebet rebop reepe reere repet repop repor repot reppe repro reprt rere- reree reret rerob retee reter retop retro rette retto ro-ro robbe robbo rober robo- robop robor robot robrt robte roero rooer roope roore roote roper roppe rorer roteb roter roto- rotor rotot rotte rotto rprop rptor t-pop t-top tbtbt teber tebet teepe tepee tepet tepor teppo teret teror terre terro tert- teter tetr- tetro tette to-be tobbe tober tobet tobor tobot tobre toerr toeto toobe toore topbt topee toper topet topo- topor topot toppo toptb topto torbe toreo toret torob torpe torpo torre torro torte torto toter toto- totoe totoo totop totte tprot treer treet trepp trept trere trete trett troee troop trop- trope tropo trott ttttt