premise: Andy has only visited South Africa, Clayton has only visited Argentina, Charlie has only visited Costa Rica, Henry has only visited New Zealand, Ray has only visited Côte D'ivore, Wade has only visited Bahrain, Andrew has only visited Netherlands, Ivan has only visited Djibouti, Harold has only visited Sudan, Sam has only visited Saint Kitts & Nevis, William has only visited Egypt, Arthur has only visited Belarus
hypothesis: Andy didn't visit South Africa