Anchor: A man is riding a horse that is trying to buck him off.
Entailed: A man rides a horse.
Contradiction: A man rides a a Harley Davidson down the street.
Contradiction: I don't think anyone is aware of what's really going on. 
Contradiction: Columbine adults and teens had different knowledge of current culture. 
Contradiction: Senior executives should not be accountable for the organization's goals.
Contradiction: Dogs are running.