effere effete effutu efreet efter- erfurt errett ettutu eutere ferfer ferrer ferret ferrur fertee ferter fetter feture feuter frefre frette freure fterer fterre fuerte 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 turfer turret turtur tururu tuteur tutter tuttut ufreet ureter urette uruffe uteute