efeler effere effete efreet efter- eleele ellett errett feeler feller felter feltre ferfel ferfer ferrel ferrer ferret fertee ferter fetter fettle fleete fletre freele frefre frelte fretel frette fterer fterre leelee leerer leetle leffel lefter lerret letter lettre r-tree re-let reefer reeffe reeler refeel refeet refeff refell refelt refert refete reflee reflet refret refter releef reller rereel reteer reteet retell retere retree retret rettel retter t-tree teetee teeter telefe telele telete telfer tellee teller terete terrel terrer terret terter tertre tetele tetete tetter treete trefet trefle trefte tretee trette