Whistle:
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The noise of the elevator, knocking
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Choir singing under the organ, Church
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Kick the bike pedals
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Boiling liquid, Chemistry, burner
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Sine wave (975Hz)
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Tablecloth
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Flag flaps in the wind on a ship
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Throw nutshells on the floor
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The receptionist trolley passes by
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Turn on the laser sword
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The noise of the room, air conditioning,
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Sounds of, voices, In the school corridor
★★★★★