premise: Peter has only visited Trinidad & Tobago, Tim has only visited Saudi Arabia, Rene has only visited Peru, Marion has only visited Georgia, Marc has only visited Ecuador, Howard has only visited Angola, Louis has only visited United Arab Emirates, Willard has only visited Bahrain, Bradley has only visited Costa Rica, Javier has only visited Guyana, Willie has only visited Botswana, Alexander has only visited Sri Lanka
hypothesis: Peter didn't visit Gabon