Anchor: A dog shows his teeth while playing with another dog.
Entailed: The dog has its mouth open.
Contradiction: The dog is barking.
Contradiction: Items that weighed over 13 ounces would be charged at First-Class rates.
Contradiction: Several people sit outside together.
Contradiction: The man and the boy are standing still on two legs, watching the environment around them.
Contradiction: A old man is smiling at an object.