Anchor: A group of horses and riders are playing polo on the grass.
Entailed: A group of horses and riders are outdoors.
Contradiction: The horses are locked in their stables.
Contradiction: There is not way for anyone to track the amount of Penguin Classics sold.
Contradiction: He lost color on his face. 
Contradiction: Three shortboarders are riding bikes on the beach.
Contradiction: A man stands at the bottom of the stairs.