premise: Corey has only visited Estonia, James has only visited Ukraine, Jeremy has only visited Lesotho, Brandon has only visited Lebanon, Chester has only visited Federated States of Micronesia, Brad has only visited Macedonia, Dan has only visited Romania, Don has only visited Uganda, Dave has only visited France, Jesse has only visited Equatorial Guinea, Roland has only visited Denmark, Tracy has only visited Iceland
hypothesis: Corey didn't visit Estonia