premise: William has only visited Ecuador, Terrence has only visited Ghana, George has only visited Macedonia, Billy has only visited Senegal, Norman has only visited Cambodia, Mark has only visited Kosovo, Anthony has only visited Chile, Wesley has only visited France, Don has only visited Central African Republic, Ronnie has only visited Azerbaijan, Dustin has only visited Bosnia & Herzegovinia, Gilbert has only visited Laos
hypothesis: Frederick didn't visit Kosovo