Anchor: A group of people racing horses on a beach.
Entailed: Horses racing on the beach.
Contradiction: cars racing on the beach.
Contradiction: There is no water.
Contradiction: Posting a picture of the art from the Degas is strictly forbidden. 
Contradiction: You don't get them until they are very old.
Contradiction: After bidding $225, I no longer wanted to pay for it.