-tree bbbee be-er bebel beber beebe beele beete beeve belee belet bellb belle berbe berel beret berle berre berte betee betel beter betle betre bett- bette bevel bever bleer bleet blere blete bleve breel breer breet brell brere brett breve brrrr btr-t ebber ebbet ebble ebell eberl ebert eeeee eeler eevee eever eleet elele eleve ellel eller ellet elver elvet erbbe erber erere ereve erte ertel erter etete etree ettel etter ettle evell evere everr evert evete evett eveve lebel leber lebet leell leere leert leeve lelle lerer letbe letre lette levee level lever levet levre rebbe rebel reber rebet reere reeve relee relet relte rere- reree reret retee retel reter rette revel rever revet revle rtrev tbtbt teber tebet teele teell tele- teler tell- telle telve teret terre tert- terve tetel teter tetle tetr- tette tevel tevet tlell tlett tllbr treer treet trele trere trete trett treve ttttt tvtel veber vebre veele veell veere veeve velet velev velle vereb verel verre verte verve vetel vetle vette vever vreel