premise: Joel has only visited Cameroon, George has only visited Trinidad & Tobago, Carl has only visited Turkmenistan, Kyle has only visited Serbia, Roy has only visited Central African Republic, Salvador has only visited The Bahamas, Henry has only visited Burundi, Roger has only visited New Zealand, Willie has only visited Uruguay, Erik has only visited Palestine, Kevin has only visited Benin, Casey has only visited Suriname
hypothesis: Salvador didn't visit San Mmarino