Anchor: The doctors urgently try to repair the leaking heart valve.
Entailed: Doctors are working on a patient.
Contradiction: A single doctor is eating a burrito in a restaurant.
Contradiction: The place where Rome was built is hidden in history.
Contradiction: Today interviewed the chair of the Kansas board and asked him about his opinion on what the professor said. 
Contradiction: A dog finds a dead body at the beach.
Contradiction: It's all by chance.