Premise: "Young adults have barbecue in the park."\nHypothesis: "The young adults are celebrating july 4th."\nDo we know that the hypothesis entailed by the premise?
Let’s work this out in a step by step way to be sure we have the right answer.
it is not possible to tell
Celebrating July 4th is not the only occasion when young adults can have a barbecue in the park.

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So, the final answer is it is not possible to tell