-er eee eer eet ere err ert ete etr ett re- ree rer ret rrr rrt rte rtr rtt te- tee ter tet tre trr trt tte ttr ttt

eeee eete erer eret erre etee eter etre ette reet rere rert rete retr rett rrrr rtee teer teet ter- tere terr tete tetr tett tre- tree tret trte trtr tter tttt

-tree eeeee erere erte erter etete etree etter reere rere- reree reret retee reter rette teret terre tert- teter tetr- tette treer treet trere trete trett ttttt

errett r-tree reteer reteet retere retret retter t-tree teetee teeter terete terrer terret terter tertre tetete tetter treete tretee trette

reteere reterre retrete rettert terere terreer terrere tettete treetee trettre