premise: Raul has only visited Lithuania, Karl has only visited Côte D'ivore, Jeff has only visited Ethiopia, Rafael has only visited Haiti, Elmer has only visited Greece, Gilbert has only visited Iran, Ivan has only visited Grenada, Willard has only visited Saint Kitts & Nevis, Melvin has only visited Djibouti, Lee has only visited Cabo, Arnold has only visited The Bahamas, Allan has only visited United States
hypothesis: Frederick didn't visit Grenada