de-err deeded deedee deeder defete deffer derere derfde derrer deterr detete detter dreder effere effete efreet efter- errett fedder federd feeded feedee feeder feered ferder ferede ferfer ferred ferrer ferret fertee ferter fetter frefre frette fterer fterre r-tree redded redder redere redred redted reeded reeder reefed reefer reeffe refeed refeet refeff refert refete reffed refret refter reteed reteer reteet retere retree retret retted retter t-tree tedded tedder teeder teetee teeter terete terrer terret terter tertre tetede tetete tetter treder treete trefet trefte tretee trette