effere effete efreet efter- eggert errett etgert ferfer fergee ferrer ferret fertee ferter fetter frefre frette fterer fterre geegee gegger gerege gerger gerret gertte getter greefe greete greffe greger gregge gregre greter grette gteter r-tree reefer reeffe refeet refeff refert refete refret refter regret reteer reteet retere retree retret retter t-tree teetee teeter terete terrer terret terter tertre tetete tetter treete trefet trefte treget tretee trette