This point has been noted repeatedly by the Government Accountability Office, a watchdog agency, and explains why items like aircraft modifications, pilot training and information systems are captured in the F-35 cost estimates but not in the support-cost estimates for previous planes.

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Also, please describe all measures taken to protect or secure that information during transmission and the periods o f time during which those measures were in effect.

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In 2005, at the height of the controversy over the site's accuracy, Mr Wales told the BBC that students who copied information from Wikipedia "deserved to get an F grade".

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The SEC initiated its look with a Dec. 12 letter to many investment-advisory f irms, seeking a wide range of information on their activities during the period between Jan. 1, 2002, and Nov. 30, 2003.

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That information comes in a Securities and Exchange Commission filing called a 13-F.

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