Popcorn machine:
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Humming fan, Computer turning on, off
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Hissing old tv
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Spaceship freezer, defrost process
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Clothes dryer
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Fan blade rotation, air cut
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A vacuum cleaner
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Electric wheelchair
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Air conditioning (outdoor unit)
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Android notification sound
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Electronic melody for SMS alerts
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Air conditioning, off, on
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Hard disk, read, spin
★★★★★