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    Download packages from:

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    - Local or remote source archives.

    pip also supports downloading from "requirements files", which provide
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      %prog [options] <requirement specifier> [package-index-options] ...
      %prog [options] -r <requirements file> [package-index-options] ...
      %prog [options] [-e] <vcs project url> ...
      %prog [options] [-e] <local project path> ...
      %prog [options] <archive url/path> ...sDownload packages.c
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