premise: Gerald has only visited United States, Bobby has only visited Switzerland, Milton has only visited Vatican City, Hector has only visited Denmark, Frederick has only visited Democratic Republic of the Congo, Arnold has only visited Peru, Kent has only visited Chad, Oscar has only visited Sri Lanka, Stanley has only visited Portugal, Theodore has only visited Belgium, Elmer has only visited Belize, Travis has only visited Saint Kitts & Nevis
hypothesis: Joshua didn't visit United States