Text: At the other extreme, an instance may be as large as an event, such as the Cuban missile crisis (Allison, 1971) and the swine flu vaccine (Neustadt and Fineberg, 1978), which have been the subjects of two well-known case studies, or the Challenger tragedy.
Entailment: The swine flu vaccine was created in 1978.
Contradiction: The swine flu has not been created yet.