-tree e-ten eeeee eener eenet eepee eeten ekene ekker ekren enent enete enker ennet enper enten enter entre epeen epene ereen erept erere ernen ernet erte erter eteke etern etete etnre etree etrek etten etter k-p-r keene keepe keere kenet kenne kente keppe kerek keren kerep keret kerne kerre ketek keten keter kette kneen kneep knepp knete kreek kreep kreke krenn krepe krete n-p-n neere neker nente neper neppe nepte neree neret nerre nerte neten netne nette ntete p-n-p p-rep peeke peene peent peere peert peete peket pekre pene- pener penne penre pent- pente pepee peppe pept- peren perer peret perke perne pernt perre perte peter petr- petre pette pptnt pre-k preen preke prene prenk prent prepn prete prnek prntr pter- ptere ptpre ptprk ptprn ptprr ptprt reene reepe reere reken rekke rekne renee rener renet renke renne rente repen repet reppe reprt rere- reree reret retee reter retnr rette rnpep rt-rk rtenn teepe teken teket tekke tekn- ten-k tenen tener tenet tenke tenne tenpn tente tepee tepet tepke terek teret terne terre tert- teten teter tetr- tette tntnt treen treer treet trene trent trepp trept trere trete trett ttnet ttttt