Anchor: Brown dog in water, with orange and blue ball in mouth.
Entailed: The dog is playing in water
Contradiction: The dog is carrying a red ball.
Contradiction: A man dances in his bedroom.
Contradiction: When the government reduces saving and debt by one dollar, national saving and investment does not, in turn, increase by a dollar. 
Contradiction: A man is piloting a boat.
Contradiction: How do we know when the time is over?