    -------------------
    copyright notices
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    Copyright (c) 1999 National Aeronautics & Space Administration All rights reserved.
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    Copyright (c) 2000 Ben Harris.
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    Copyright (c) 2001 ARM Ltd All rights reserved.
    Copyright (c) 2001 Atsushi Onoe
    Copyright (c) 2001 Ben Harris All rights reserved.
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    Copyright (c) 2001 The NetBSD Foundation, Inc. All rights reserved.
    Copyright (c) 2001, 2003 Anders Magnusson (ragge@ludd.luth.se). All rights reserved.
    Copyright (c) 2001, Rector and Visitors of the University of Virginia. All rights reserved.
    Copyright (c) 2001-2002 Kungliga Tekniska Högskolan (Royal Institute of Technology, Stockholm, Sweden). All rights reserved.
    Copyright (c) 2001-2002, by the Rector and Board of Visitors of the University of Virginia. All rights reserved.
    Copyright (c) 2002 INRIA. All rights reserved.
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    Copyright (c) 2002-2005 Sam Leffler, Errno Consulting All rights reserved.
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    Copyright (c) 2005 Iain Hibbert.
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    Copyright (c) 2011 Ben Gray <ben.r.gray@gmail.com>. All rights reserved.
    Copyright 1996 Matt Thomas <matt@3am-software.com> All rights reserved.
    Copyright 1997 Marshall Kirk McKusick. All Rights Reserved. This code is derived from work done by Greg Ganger at the University of Michigan.