effere effoff effore ekero epopee feeror feofor ferfer feroke ferrer ferro- foerre fokker foofoo fooker fopper forker forrer freeof freepr frefre froofe keefer keeffe keeker keeper keokee kepper kerker koffee kokopo kokoro kokpek kookoo koopoo kopeek koreke korere korero korkor kororo korrek kreker kreope krokek oferre ofpoor okeefe okerer okopek okpofe okpoko ookroo oooooo orpeko peeker peepee peeper peerer peffer pepero pepkor pepper perere peroff peroke peroor perore perper perree poffer pokerf pookoo pooper poopoo poorer popfor popoff popopo poporo popper poppop porker ppoker pppppp pre-op prefer preffe preore profer proffe profor profre proker prokke prokop proper propre reefer reeffe reeker reekof reeper refeff repope repper repref reroof roeper roepke rokker rokkor roofer rooker roopee roopek rooper rorek