-tree bbbee bbser be-er beber bebes beebe beebs beers beest beete beets berbe beres beret berre berse berte berts besee beset besse beste bests betee beter betes betre betrs bett- bette betts breer brees breet brere brers brese bress brest brets brett brrrr btr-t ebber ebbet ebers ebert eeeee erbbe erber erebs erere erest erets erres erses erste ersts erte erter ertes esere esser esses essse estee ester estes estet estre etest etete etree etres etter ettes rebbe reber rebet rebts reere reese reest rere- reree reres reret resee reses reset resse reste restr rests retee reter retes rette retts sebbe sebes sebet seebe seere seers seese seest seete serbs serer seres seret serre serse serss sert- serte serts seser seses sesse seste setee seter setse sette setts sssrb sssss steer stees steet stere sterr sters stert stete stets strbe streb stree stret strrs tbtbt teber tebet teebs teers teese teest teets teres teret terre terrs terse tert- tesse teste tests teter tetes tetr- tette treer trees treet trere tres- trese tress trest trete trets trett tsebe tsere tsets ttest ttttt