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/* Hierarchical argument parsing, layered over getopt
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Copyright (C) 1995-2000, 2002-2004, 2009-2012 Free Software Foundation, Inc.
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Copyright (C) 1995-2000, 2002-2004, 2009-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Miles Bader <miles@gnu.ai.mit.edu>.