premise: Leon has only visited United States, Richard has only visited Russia, Craig has only visited United Kingdom, Pedro has only visited Peru, Raul has only visited Namibia, Freddie has only visited Venezuela, Clarence has only visited Antigua & Barbuda, Corey has only visited Jamaica, Eduardo has only visited Maldives, Reginald has only visited Singapore, Byron has only visited Republic of the Congo, George has only visited Eritrea
hypothesis: Byron didn't visit Republic of the Congo