Anchor: A gentleman rides his mountain bike down rough terrain while wearing a white helmet.
Entailed: A man is doing an outdoor sport.
Contradiction: A man rides his mountain bike down a waterfall wearing a blue helmet.
Contradiction: Two boys are doing their homework.
Contradiction: Alcohol abuse is less common.
Contradiction: a man is watching a decorator work on somebody elses home.
Contradiction: The dogs are in teh water