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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Atmospheric diffraction is manifested in the following principal ways: Optical atmospheric diffraction Radio wave diffraction is the scattering of radio frequency or lower frequencies from the Earth's ionosphere, resulting in the ability to achieve greater distance radio broadcasting. Sound wave diffraction is the bending of sound waves, as the sound travels around edges of geometric objects.  This produces the effect of being able to hear even when the source is blocked by a solid object." ] ,
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