-tree e-ten eeeee eener eenet eepee eeten eevee eever enent enete ennet enper enten enter entre enver epeen epene ereen erept erere ereve ernen ernet erte erter erven etern etete etnre etree etten etter even- evene event evere everr evert evete evett eveve evren n-p-n neere neeve nente neper neppe nepte neree neret nerre nerte nerv- nerve neten netne nette nettv neven never nevet nevre nevve ntete p-n-p p-rep peene peent peere peert peete peeve pene- pener penev penne penre pent- pente pepee peppe pept- peren perer peret perne pernt perre perte perve peter petr- petre pette pptnt preen prene prent prepn prete pretv preve prntr pter- ptere ptpre ptprn ptprr ptprt reene reepe reere reeve renee rener renet renne rente repen repet reppe reprt rere- reree reret retee reter retnr rette reven revep rever revet rnpep rtenn rtrev teepe tenen tener tenet tenne tenpn tente tepee tepet teret terne terre tert- terve teten teter tetr- tette tevet tntnt treen treer treet trene trent trepp trept trere trete trett treve ttnet ttttt veere veeve venee vener venet venev venne vente vepen veper veren verne verre verte verve veten vette vever