premise: Oscar has only visited South Africa, Ivan has only visited Namibia, Jon has only visited San Mmarino, Terrance has only visited Georgia, Allan has only visited Saint Lucia, Craig has only visited Uganda, Alvin has only visited Antigua & Barbuda, Ricky has only visited Guatemala, Joshua has only visited Malaysia, Melvin has only visited Angola, Perry has only visited Zambia, Claude has only visited Mauritania
hypothesis: Ivan didn't visit Qatar