premise: A brown dog persues a Frisbee across the grass as the thrower watches. hypothesis: A dog plays in the park.
entailment: A dog that pursues a frisbee on the grass is playing on a park.|entailment: A park is a logical place for a dog to be catching a Frisbee on the grass.|entailment: Since the dog is running across the grass and a person is throwing a Frisbee, it can be assumed they are in a park.