-tree b-e-d bbbee bd-re be-er bebed beber bedde bedee beder bedet beebe beede beerd beete berbe berde bered beret berre berte betee beter betre bett- bette bredd brede bredt breed breer breet brerd brere brett brrrr btr-d btr-t ddddd debed deber debet debte dedde dedee deder deede deere derbe derde dered derre deter detre dette drdre dredd drede dreed drere e-dee ebbed ebber ebbet ebert edder eddre edere edred eeeee eerde erbbe erber erdre erede erere erred erte erter etete etree etter rebbe reber rebet redbd redde reder reede reere rerde rere- reree reret reted retee reter rette tbtbt teber tebet teder teerd teret terre tert- teter tetr- tette treed treer treet trere trete trett ttttt