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   Find the latitude and longitude of a major U.S. city.
   Available cities:
     - New York
     - Washington D.C.
     - Miami
     - Los Angeles
     - San Francisco
     - Seattle
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   Form:
   [lat,lon] = LatLon( city )
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   Inputs
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   city        (:)       Name of city

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   Outputs
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   lat         (1)       Latitude  [deg]
   lon         (1)       Longitude [deg]

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