premise: Steven has only visited Vanuatu, Marshall has only visited United Arab Emirates, William has only visited Senegal, Jon has only visited Israel, Jay has only visited Madagascar, Zachary has only visited Eswatini, Luis has only visited Laos, Darrell has only visited Seychelles, Isaac has only visited São Tomé & Prícipe, Tim has only visited South Sudan
hypothesis: Zachary didn't visit Haiti