Sound to start presentation:
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Electronic melody for SMS alerts
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Off, Old tv on
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Portable fan
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Sound to start presentation
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Vibration noise, Faulty air conditioning
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Fan blade rotation, air cut
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Air conditioning (outdoor unit)
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Android notification sound
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Whatsapp notification sound
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Popcorn machine
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Off, Computer turning on, humming fan
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On, Air conditioning, off
★★★★★