Anchor: Two african american young boys reading story books.
Entailed: The two young boys who are african american are reading books.
Contradiction: The two young boys are walking out of the room.
Contradiction: Two cats are racing each other in the grass.
Contradiction: A dog playing with a frisbee.
Contradiction: Most people in the US have not done any type of volunteer work before. 
Contradiction: a man is doing gymnastics