Laboratory experiment:
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Girls, instructor, Dance school
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Throw a backpack on the floor
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Spray Shaving Foam
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Sine wave (975Hz)
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Spinning, Fishing, spinning reels
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Voices, sounds of, In the school corridor
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Wooden whistle
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Throw a small bag, wallet, purse on the floor
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Servo motor
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Pull telescopic antenna
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Tinder duster surface
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Trampoline (diving)
★★★★★