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/* undo handling for GNU Emacs.
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Copyright (C) 1990, 1993, 1994, 2000, 2001, 2002, 2003, 2004,
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2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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This file is part of GNU Emacs.