premise: Greg has only visited Togo, Lewis has only visited Japan, Dwight has only visited San Mmarino, Maurice has only visited Guinea-Bissau, Rene has only visited Mozambique, Earl has only visited Kenya, Lester has only visited Venezuela, Ray has only visited Singapore, Jimmy has only visited Saint Vincent & the Grenadines, Edward has only visited Moldova, Marion has only visited Botswana, Salvador has only visited Brunei
hypothesis: Jerome didn't visit Guinea-Bissau