de-err dedute deeded deedee deeder derere derrer derure deterr detete detter deuter dreder dudder duerer dueted duetee duette duttee errett ettutu eutere r-tree redded redder reddur redere redred redted redure reeded reeder reteed reteer reteet retere retree retret retted retter rettur returu reuere reuter reutte rudder rudrur rurutu rutted ruttee rutter t-tree tedded tedder tedure teeder teetee teeter terete terrer terret terter tertre tetede tetete tetter treder treete tretee trette truett tudder turret turtur tururu tuteur tutted tutter tuttut urdeur ureter urette uteute