Given the sentence "A group standing around in the background while a person stretches with her arms up in the air in the doorway." is it true that "A woman stretches before performing her gymnastic stunt."?
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
Just because group standing around in the background while a person stretches with her arms up in the air in the doorway does not indicate that she stretches before performing her gymnastic stunt.

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The answer is it is not possible to tell