Anchor: Three people in a dimly lit room.
Entailed: Humans are gathered in a room.
Contradiction: Four people are in a bright office.
Contradiction: I did not have a dog before my son was born.  
Contradiction: We can just see what happens. 
Contradiction: Why do people tell you that they have the best lettuce in town?
Contradiction: The boy is wearing a shirt of a cartoon chracter.