premise: Russell has only visited Zimbabwe, Armando has only visited Oman, Chad has only visited Vanuatu, Angel has only visited Saint Vincent & the Grenadines, Casey has only visited Kiribati, Chris has only visited Republic of the Congo, Julio has only visited Federated States of Micronesia, Kent has only visited Liechtenstein, Barry has only visited Belarus, Douglas has only visited Georgia, Ronald has only visited Tajikistan
hypothesis: Felix didn't visit Republic of the Congo