Anchor: A group of climbers begin up a sheer rock face.
Entailed: Some climbers begin up a rock face.
Contradiction: A group of children begin up a jungle gym.
Contradiction: Equal amounts of time have the same benefits, no matter how they are broken up. 
Contradiction: I bought some for my friend. who has a CD player.
Contradiction: A woman is building a Jenga stack in order to pay for school because a man is watching her play Jenga and paying her by the hour while he eats cheeseburgers.
Contradiction: The fire that destroyed St. Paul's also destroyed a Jesuit fort.