Anchor: A black and white dog is chasing a ping Frisbee.
Entailed: A black dog is running around.
Contradiction: The black dog is related to the white dog.
Contradiction: The black and white dogs are chasing a duck.
Contradiction: Africans did not trade gold. 
Contradiction: A man and a woman sit on a bench outside of a store.
Contradiction: A man stealing plants from his distant neighbor, quickly paddling away in this post-raccoon magisterial world.