Document license
You may download, use, and modify this document as long as (a) you do not charge anyone for the document (other than a reasonable charge for the media it is reproduced on); (b) you do not remove the copyright from any unmodified document; and (c) if you do modify the document you give credit to the original copyright holder. That is, it is free for your use as long as don't make money off it and you don't claim credit when you shouldn't.
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