Anchor: Two men are riding horses, one horse is brown and one is black.
Entailed: Some men are riding horses.
Contradiction: The men are walking through a field with their dogs.
Contradiction: The recommendation was opposed by Robert Woolard because very little research had been done on screening.
Contradiction: A crowd behind a fence watches bicyclists ride up a hill with motorcycles riding behind them
Contradiction: I hate close games. 
Contradiction: I can see how that would be difficult to use.