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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The theory of relativity, or simply relativity in physics,  usually encompasses two theories by Albert Einstein: special relativity and general relativity.Concepts introduced by the theories of relativity include:Measurements of various quantities are relative to the velocities of observers. In particular, space contracts and time dilates.Spacetime: space and time should be considered together and in relation to each other." ] ,
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