eeuler efeler effere ekuele eleele euller feeler felker feller ferfel ferfer ferrel ferrer ferrur ferule fleker flekke fleure fluker flurre freele frefre frekel freure fueler fuffle fulker fuller furfur furler furrer furrfu keefer keeffe keeker keekle keeler keffel kekule kelkel kellee keller kereru kerker kerkuk keuruu kleeer krekel kreker kukere kullur kululu kurell kurkul kurree kururu kuuele leeful leelee leerer leffel lefull lekker luffer lufful lukulu luller lurker lurulu reefer reeffe reeker reeler reeuel refeel refeff refell reflee reflue refuel refurl releef releke reller relleu rereel rerule reuele reuere reuler reulle rueful ruelle ruffer ruffle rukkle ruller rurkee urkulu uruffe