-tree e-pro eeeee eepee eorre epopt epote erept erere eroor erore eroto error erte erter etete etext etoro etree etter exept exert exopt exore exort exper expro exptr exter extre extro oeppo oo-er ooooo opepe opere opper opter opto- optot optto oreo- orere orero orexo oroer orret orter ortet ortoo otere otero ototo otpor otter oxter p-o-x p-rep peere peert peete pepee peppe pept- pepto perer peret perot perox perre perro perte perto peter petr- petre petro pette petto po-po poete pooer poope poopo poore poort poote poper popet popex popop poppe poppo porer poret poro- porro porte porto potee poter potoo potop potor potpe potro potte potto pppox preop prete preto proer proor proot prop- prope propp propr propt prore prot- proto prtor pter- ptere ptero ptpre ptpro ptprr ptprt reepe reere reorx repet repop repor repot reppe repro reprt rere- reree reret retee reter retex retop retox retro rette retto rexer ro-ro roero rooer roope roore roote roper roppe rorer roter roto- rotor rotot rotox rotte rotto rprop rptor rtext t-pop t-rex t-top teepe tepee tepet tepor teppo teret terex teror terre terro tert- teter tetex tetr- tetro tette texor texte toerr toeto toore topee toper topet topo- topor topot toppo topto toreo toret torpe torpo torre torro torte torto torxe toter totex toto- totoe totoo totop totte toxo- tprot treer treet trepp trept trere trete trett troee troop trop- trope tropo trott ttttt xero- xerox xerte xetex xexex xootr xorro xotox xoxox xtext xtort xtree