effere effete effutu efreet efter- erfurt errett ettutu eutere ferfer ferrer ferret ferrur fertee ferter fetter feture feuter frefre frette freure fterer fterre furfur furrer furrfu futret futter future r-tree reefer reeffe refeet refeff refert refete refret refter refute reteer reteet retere retree retret retter rettur returf returu reuere reuter reutte rufete ruffer ruffet rufter rurutu ruttee rutter t-tree teetee teeter terete terrer terret terter tertre tetete tetter treete trefet trefte tretee trette truett trufte tuffet tufter turfer turret turtur tururu tuteur tutter tuttut ufreet ureter urette uruffe uteute