premise: Ronald has only visited Uganda, Ross has only visited Laos, Douglas has only visited Canada, Brett has only visited Germany, Rafael has only visited South Korea, Don has only visited Tajikistan, Leroy has only visited Guinea, David has only visited Togo, Timothy has only visited Gabon, Danny has only visited Mauritius, Arthur has only visited Central African Republic, Stephen has only visited Greece
hypothesis: Floyd didn't visit Tajikistan