Premise: "A motorcyclist is pulling a wheelie on a motocross bike as he rides it up a dirt track."\nHypothesis: "A motorcyclist is on a dirt track."\nDo we know that the hypothesis entailed by the premise?
Let's be accurate as possible. Think before you answer.
yes
Answer: Dirt track implies that the motorcyclist is doing a wheelie on a motocross bike.

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So, the final answer is yes