Student: Test for natural language inference.\nPremise: "A dog is running through the water chasing after a ball."\nHypothesis: "A dog is chasing a tennis ball his owner threw into the water."\nIs the hypothesis entailed by the premise?\nOptions:\n- yes\n- no\n- it is not possible to tell.
Teacher: Let's think:

User
A dog chasing after a ball is not necessarily chasing a tennis ball and not necessarily a ball his owner threw. So the final answer is it is not possible to tell.
Assistant