-er eee eek eer eet eke ekr ekt ere erk err ert ete etk etr ett k-t ke- kee kek ker ket kke kkk kkr kkt krk krr krt kte ktk ktr ktt re- ree rek rer ret rke rkk rkt rrk rrr rrt rte rtk rtr rtt te- tee tek ter tet tke tkk tkr tkt tre trk trr trt tte ttk ttr ttt

eeee eeke eete ekek eker eket erer eret erke erre etee eter etre ette keek keer keet keke ker- kere kerk kerr kert ket- kete ketk ketr kett kkkk kkre kkrk kkrr kkrt kktk kree krek kret krke krkk krkr krre krrk krrr krrt krtk krtr ktee ktek ktke ktkk ktkr ktkt ktre ktrk ktrr ktrt kttk kttr kttt reek reet reke rekt rere rert rete retr rett rrrr rtee teek teer teet teke ter- tere terk terr tete tetr tett tre- tree trek tret trte trtr tter tttt

-tree eeeee ekker erere erte erter eteke etete etree etrek etter keere kerek keret kerre ketek keter kette kreek kreke krete reere rekke rere- reree reret retee reter rette rt-rk teket tekke terek teret terre tert- teter tetr- tette treer treet trere trete trett ttttt

errett k-tree keeker kerker kertee kreker kretek r-tree reeker reteer reteet retere retree retret retter t-tree teetee teeter terete terrer terret terter tertre tetete tetter treete treker tretee trette

ekekete kee-kee kreeker reteere reterre retrete rettert terere terreer terrere tettete treetee trekker trettre

ketterer teketeke

keek-keek