Anchor: A dog chases a Nerf ball in the grass.
Entailed: The dog is outdoors
Contradiction: The cat fetches the Nerf ball
Contradiction: The letter writer insisted that the US approved Diem's assassination. 
Contradiction: The person works on their art.
Contradiction: A elderly woman is being mugged by a young boy dressed in black.
Contradiction: A croud of people outdoors.