premise: Phillip has only visited Mexico, Hector has only visited Singapore, Ronnie has only visited Turkmenistan, Tyler has only visited Iraq, Rafael has only visited Georgia, Milton has only visited Antigua & Barbuda, Oscar has only visited Belgium, Hugh has only visited Madagascar, Chad has only visited Bahrain, Enrique has only visited Slovakia, Joshua has only visited Benin, Darrell has only visited São Tomé & Prícipe
hypothesis: Hugh didn't visit Eritrea