-tree eeeee ef-ts efere efetf effer effet effts efter ekers ekker erere eresk erest erets erres erses erste ersts erte erter ertes esere esker esref esser esses essse estee ester estes estet estre eteke etest etete etree etrek etres etter ettes feere feers feese feets feres feret ferr- ferre ferse ferte feser fesse fest- feste fests feter fetes fette freek freer frees freet freke frere frese fress frest frets frett fseek ftest ftrtt k-set keefe keeks keere keest keets kefee kerek keres keret kerfs kerre kerrs kerse kerss keser kesse keste ketek keter kette kfest kreef kreek krees kreke kresk kress krest krete reefe reefs reeft reeks reere reese reesk reest refer refet reffe refts rekke rere- reree reres reret resee reses reset reske resse reste restr rests retee reter retes rette retts rsssf rt-rk seeke seeks seere seers seese seest seete sefer sefes seffe sefte seker sekes sekke seref serer seres seret serfe serff serfs serke serre serse serss sert- serte serts seser seses sesse seste setee seter setse setsf sette setts skeer skees skeet skere skerf skers skete skrte sssss steek steer stees steet steff steke stere sterk sterr sters stert stete stets stker stree strek stret strrs teers teese teest teets tefe teffs tekes teket tekke terek teres teret terre terrs terse tersk tert- tesse teste tests teter tetes tetr- tette treer trees treet trefe treff trefs treks trere tres- trese tress trest trete trets trett trsek tsere tsets ttest ttttt