premise: Claude has only visited Tanzania, Gary has only visited Antigua & Barbuda, Dwight has only visited Belarus, Jason has only visited Papua New Guinea, Eddie has only visited Grenada, Scott has only visited Romania, John has only visited Saint Kitts & Nevis, Manuel has only visited Zambia, Felix has only visited Burundi, Stephen has only visited Panama, Dennis has only visited United Kingdom, Richard has only visited Mauritania
hypothesis: Gregory didn't visit Saint Kitts & Nevis