-tree eeeee eepee efere efetf effer effet efter ekker eptfe erept erere erte erter eteke etete etree etrek etter feere feret ferr- ferre ferte feter fette freek freep freer freet freke frere frett ftrtt k-p-r keefe keepe keere kefee keppe kerek kerep keret kerre ketek keter kette kreef kreek kreep kreke krepe krete p-rep peeke peere peert peete peket pekre pepee peppe pept- perer peret perke perre perte peter petr- petre pette pre-k preef preff preke prete pter- ptere ptpre ptprf ptprk ptprr ptprt reefe reeft reepe reere refer refet reffe rekke repet reppe reprt rere- reree reret retee reter rette rperf rt-rk teepe tefe teket tekke tepee tepet tepke terek teret terre tert- teter tetr- tette treer treet trefe treff trepp trept trere trete trett ttttt