premise: Billy has only visited Venezuela, Brian has only visited Sri Lanka, Luis has only visited New Zealand, Freddie has only visited Jordan, Louis has only visited Kuwait, Cory has only visited Democratic Republic of the Congo, Erik has only visited Tanzania, Alex has only visited Mali, Pedro has only visited Costa Rica, Norman has only visited Australia, Derrick has only visited Niger, Keith has only visited Côte D'ivore
hypothesis: Felix didn't visit Australia