Anchor: Two dark colored dogs romp in the grass with a blue Frisbee.
Entailed: Animals are interacting with a blue object.
Contradiction: Two dogs are playing with a green tennis ball.
Contradiction: Behind the town lies only a flat, empty plain. 
Contradiction: people standing on the sidewalk next to a track
Contradiction: The goalie is taking a break.
Contradiction: Napoleon I was the person who thought of the Arc de Triomphe.