premise: Dave has only visited Mauritania, Willard has only visited Iraq, Brad has only visited Syria, Larry has only visited Turkmenistan, Alfredo has only visited Burkina, Greg has only visited Fiji, Corey has only visited Bhutan, Reginald has only visited El Salvador, Carlos has only visited Myanmar, Matthew has only visited Kuwait, Rodney has only visited Indonesia, Wayne has only visited Australia
hypothesis: Darrell didn't visit Mauritania