premise: Marc has only visited Yemen, Jeremy has only visited Uruguay, Brett has only visited Egypt, Tom has only visited Slovenia, Derek has only visited Belize, Guy has only visited Saint Lucia, Sam has only visited Australia, Lloyd has only visited Eritrea, William has only visited Philippines, Clarence has only visited Eswatini, Zachary has only visited Mauritania, Marshall has only visited Mauritius
hypothesis: Clarence didn't visit Eswatini