Laboratory experiment:
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Shower curtain opens, closes
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Close the castle, Diplomat, briefcase, open
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Bicycle rear wheel ratchet
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Popping bubbles, Air bubble film
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Balloon bursts
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Ground powder on the table, Chemistry
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Dragging an item on a concrete floor
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Opening, closing the umbrella
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Tinder duster surface
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Pounding in the mud
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Beep time
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Flag flaps in the wind on the seashore
★★★★★