Answer the following question, with explanation first.
Test for natural language inference.\nPremise: "A band consisting of three men and a woman perform in an alley with a van in the background."\nHypothesis: "A band is having an impromptu practice in front of their tour van before a concert."\nIs the hypothesis entailed by the premise?\nOptions:\n- yes\n- no\n- it is not possible to tell

it is not possible to tell
Not all bands are having an impromptu practice in front of their van.

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