-tree e-pro eeeee eepee efere efetf effer effet efore efter eofor eorre epopt epote eptfe erept erere eroor erore eroto error erte erter etete etoro etree etter feeor feere fefor feoff feret ferr- ferre ferro ferte feter feto- fetor fette foore foote fore- foreo foret forro forte forto fotte fprot freep freer freet frere frett froop froot frore frote ftrtt o-fer oeppo offer offof offre offto ofoto ofpop ofter oo-er ooooo opepe opere opper opter opto- optot optto oreo- orere orero orfeo orfoe orfor 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 pforp po-po poete pooer poope poopo poore poort poote poper popet popop poppe poppo porer poret poro- porro porte porto potee poter potof potoo potop potor potpe potro potte potto preef preff preop prete preto proer profe proff proft proof proor proot prop- prope propp propr propt prore prot- proto prtor pter- ptere ptero ptpre ptprf ptpro ptprr ptprt reefe reeft reepe reere refer refet reffe reffo repet repop repor repot reppe repro reprt rere- reree reret retee reter retop retro rette retto ro-ro roero roffe rofor rooer roofe rooft roope roore roote roper roppe rorer roter roto- rotor rotot rotte rotto rperf rprop rptor t-pop t-top teepe tefe tepee tepet tepor teppo teret teror terre terro tert- teter tetr- tetro tette toeof toerr toeto tofet toffo tofop tofor tofte toore topee toper topet topo- topof topor topot toppo topto toreo toret torpe torpo torre torro torte torto toter toto- totoe totoo totop totte tprot treer treet trefe treff trepp trept trere trete trett troee trofe troff troft troop trop- trope tropo trott ttttt