premise: Herman has only visited San Mmarino, Claude has only visited Canada, Rene has only visited Lesotho, Oscar has only visited Sierra Leone, Clifford has only visited Central African Republic, Joseph has only visited Mauritania, Shawn has only visited Mauritius, Scott has only visited Turkmenistan, Ruben has only visited Algeria, Ray has only visited Comoros
hypothesis: Dwight didn't visit Sierra Leone