premise: Manuel has only visited Tajikistan, Marcus has only visited Israel, Dwight has only visited Slovenia, Wesley has only visited Slovakia, Dwayne has only visited Yemen, Derrick has only visited Myanmar, Troy has only visited Mauritania, Dustin has only visited El Salvador, Oscar has only visited Madagascar, Cecil has only visited Malta, Wallace has only visited Guyana, Vincent has only visited Belgium
hypothesis: Derrick didn't visit Myanmar