premise: Clifton has only visited Mauritania, Brett has only visited Samoa, Gilbert has only visited Maldives, Jared has only visited Sierra Leone, Edgar has only visited Georgia, Joel has only visited Costa Rica, Leslie has only visited Tunisia, Terrance has only visited Guinea-Bissau, Walter has only visited Netherlands, Lonnie has only visited Cambodia, Milton has only visited Serbia
hypothesis: Micheal didn't visit Guinea-Bissau