effere effete efreet efter- emeere emeter emmert emmett errett f-term femmer ferfer ferrer ferret fertee ferter fetter frefre frette fterer fterre m-tree meeter meetme meetre mememe memere merete mermer mermet merrem merret merter meteer metrer metter mettet r-tree reefer reeffe refeet refeff refert refete refret refter remeet remete reteer reteet retere reterm retree retret retter t-tree teemer teerme teetee teeter temere terete termer terrer terret terter tertre tetete tetter treete trefet trefte tremet tretee trette