-tree e-pro eeeee eepee eorre epopt epote erept erere eroor erore eroto error erte erter etete etoro etree etter oeppo oo-er ooooo opepe opere opper opter opto- optot optto oreo- orere orero oroer orret orter ortet ortoo otere otero ototo otpor otter p-rep peere peert peete pepee peppe pept- pepto perer peret perot perre perro perte perto peter petr- petre petro pette petto po-po poete pooer poope poopo poore poort poote poper popet popop poppe poppo porer poret poro- porro porte porto potee poter potoo potop potor potpe potro potte potto preop prete preto proer proor proot prop- prope propp propr propt prore prot- proto prtor pter- ptere ptero ptpre ptpro ptprr ptprt reepe reere repet repop repor repot reppe repro reprt rere- reree reret retee reter retop retro rette retto ro-ro roero rooer roope roore roote roper roppe rorer roter roto- rotor rotot rotte rotto rprop rptor t-pop t-top teepe tepee tepet tepor teppo teret teror terre terro tert- teter tetr- tetro tette toerr toeto toore topee toper topet topo- topor topot toppo topto toreo toret 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