Faulty air conditioning, vibration noise:
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Electric razor
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Hissing old tv
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Air conditioning (outdoor unit)
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Whatsapp notification sound
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Sound to start presentation
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Off, Computer turning on, humming fan
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Electric wheelchair
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Electronic melody for SMS alerts
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Spin, read, Hard disk
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Fan blade rotation, air cut
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Windows notification sound
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Air conditioning, on, off
★★★★★