2 answers:
A trial to see if an experiment works. just like the other person said but i’m actually sure about it shaking my head.
I'm guessing a dummy run is something that you use a test dummy to see how something will work, example a crash dummy were they put inside a car that crashes to a solid object . a trial run/procedure kind.
(hope this help)
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B symbolism
Explanation:
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A
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