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Yes, but, how are your ears?
http://www.wimp.com/audioillusions/
You'll have to listen to the whole thing to know...I couldn't hear it...I must be waaay over 20 
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
-- Benjamin Franklin
lib·er·ty
/ˈlibərdē/
noun
1.
the state of being free within society from oppressive restrictions imposed by authority on one's way of life, behavior, or political views
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