-tree e-ten eeeee eener eenet eepee eeten enent enete ennet enper enpeu enrut enten enter entex entre enure enurn epeen epene epure ereen erept erere ernen ernet errtu erte erter ertun erupt etern etete etext etnre etree etrun etten etter eturu eunet eupen eurex eurre exene exept exert exner exper exptr exter extre extue exute n-p-n neere neetu nente neper neppe nepte neree neret nerre nerte nerur neten netex netne nette neuen neuer neueu neune neur- neure nexen nextt nptxr ntete nu-nu nunet nunun nupen nupur nure- nurun nutte nuttx p-n-p p-rep peene peent peere peert peete pene- pener penex penne penre pent- pente pentu penup penur pepee peppe pept- pepup peren perer peret perne pernt perre perte perun perur peter petr- petre petru pette petun petur peure pptnt preen prene prent prepn prete preux prntr pruen prun- prune prunt prute pter- ptere ptpre ptprn ptprr ptprt ptpru puett punee punne punte pupet puppe puree puren purer purex purre purte puten puter putre putt- putte puttu putun putup re-up reene reepe reere renee rener renet renne rente repen repet reppe reprt repun reput rere- reree reret rerun retee reter retex retnr rette reuen reuer reuet reune reute rexen rexer rnpep rtenn rtext ruere ruete rueun runer runet runne runte runup rupee ruper ruten ruter rutte ruutu t-nut t-rex teepe teeup tenen tener tenet teneu tenex tenne tennu tenpn tente tenue tenup tenur tepee tepet tepeu teppu tepun teret tereu terex terne terre tert- teten teter tetex tetr- tette texte tntnt treen treer treet trene trent trepp trept trere trete trett treut treux truer truex trupt trute truxe ttnet ttttt tuene tune- tuner tunne tupee turen turet turn- turne turnp turnt turnu turre turtu turup turut tutee tutte tutun tuuru tuxen unerp unete unnet unnun unnur unnut unpen unpeu unput unrep unrun unten unter unurn upeet upenn uppen upper upput uprun upter urent urter urupe urutu utenn uter- utter uttur uturn uturu uunet uuuuu xerte xetex xexeu xexex xtext xtree xtune xunpu