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Impacts from hitting a wall during a rescue mission
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Knocking two coffee cups together
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Metalic tapping, some background air
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Person walking up to the cockpit door, knocking, opening the door and standing in the doorway
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Knuckles rapping on glass window
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Knocking on cockpit door and then opening it
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A wooden bathroom door being pounded 5 times impatiently .
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Professional espresso machine - tapping portafilter three times.