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GNU Free Documentation License
                     Version 1.2, November 2002
    Copyright (C) 2000,2001,2002 Free Software Foundation, Inc.
    59 Temple Place, Suite 330, Boston, MA  02111-1307, USA
    Everyone is permitted to copy and distribute verbatim copies
    of this license document, but changing it is not allowed.
    The purpose of this License is to make a manual, textbook, or other
    functional and useful document "free" in the sense of freedom: to
    assure everyone the effective freedom to copy and redistribute it,
    with or without modifying it, either commercially or
    noncommercially.  Secondarily, this License preserves for the
    author and publisher a way to get credit for their work, while not
    being considered responsible for modifications made by others.
    This License is a kind of "copyleft", which means that derivative
    works of the document must themselves be free in the same sense.
    It complements the GNU General Public License, which is a copyleft
    license designed for free software.
    We have designed this License in order to use it for manuals for
    free software, because free software needs free documentation: a
    free program should come with manuals providing the same freedoms
    that the software does.  But this License is not limited to
    software manuals; it can be used for any textual work, regardless
    of subject matter or whether it is published as a printed book.
    We recommend this License principally for works whose purpose is
    instruction or reference.
    This License applies to any manual or other work, in any medium,
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    The "Invariant Sections" are certain Secondary Sections whose
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    be at most 25 words.
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    You may copy and distribute a Modified Version of the Document
    under the conditions of sections 2 and 3 above, provided that you
    release the Modified Version under precisely this License, with
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    licensing distribution and modification of the Modified Version to
    whoever possesses a copy of it.  In addition, you must do these
    things in the Modified Version:
      A. Use in the Title Page (and on the covers, if any) a title
         distinct from that of the Document, and from those of
         previous versions (which should, if there were any, be listed
         in the History section of the Document).  You may use the
         same title as a previous version if the original publisher of
         that version gives permission.
      B. List on the Title Page, as authors, one or more persons or
         entities responsible for authorship of the modifications in
         the Modified Version, together with at least five of the
         principal authors of the Document (all of its principal
         authors, if it has fewer than five), unless they release you
         from this requirement.
      C. State on the Title page the name of the publisher of the
         Modified Version, as the publisher.
      D. Preserve all the copyright notices of the Document.
      E. Add an appropriate copyright notice for your modifications
         adjacent to the other copyright notices.
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         notice giving the public permission to use the Modified
         Version under the terms of this License, in the form shown in
         the Addendum below.
      G. Preserve in that license notice the full lists of Invariant
         Sections and required Cover Texts given in the Document's
         license notice.
      H. Include an unaltered copy of this License.
      I. Preserve the section Entitled "History", Preserve its Title,
         and add to it an item stating at least the title, year, new
         authors, and publisher of the Modified Version as given on
         the Title Page.  If there is no section Entitled "History" in
         the Document, create one stating the title, year, authors,
         and publisher of the Document as given on its Title Page,
         then add an item describing the Modified Version as stated in
         the previous sentence.
      J. Preserve the network location, if any, given in the Document
         for public access to a Transparent copy of the Document, and
         likewise the network locations given in the Document for
         previous versions it was based on.  These may be placed in
         the "History" section.  You may omit a network location for a
         work that was published at least four years before the
         Document itself, or if the original publisher of the version
         it refers to gives permission.
      K. For any section Entitled "Acknowledgements" or "Dedications",
         Preserve the Title of the section, and preserve in the
         section all the substance and tone of each of the contributor
         acknowledgements and/or dedications given therein.
      L. Preserve all the Invariant Sections of the Document,
         unaltered in their text and in their titles.  Section numbers
         or the equivalent are not considered part of the section
      M. Delete any section Entitled "Endorsements".  Such a section
         may not be included in the Modified Version.
      N. Do not retitle any existing section to be Entitled
         "Endorsements" or to conflict in title with any Invariant
      O. Preserve any Warranty Disclaimers.
    If the Modified Version includes new front-matter sections or
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    add their titles to the list of Invariant Sections in the Modified
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    You may add a section Entitled "Endorsements", provided it contains
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    definition of a standard.
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    and a passage of up to 25 words as a Back-Cover Text, to the end
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    You may combine the Document with other documents released under
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    modified versions, provided that you include in the combination
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    unmodified, and list them all as Invariant Sections of your
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    their Warranty Disclaimers.
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    multiple identical Invariant Sections may be replaced with a single
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    original author or publisher of that section if known, or else a
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    the list of Invariant Sections in the license notice of the
    combined work.
    In the combination, you must combine any sections Entitled
    "History" in the various original documents, forming one section
    Entitled "History"; likewise combine any sections Entitled
    "Acknowledgements", and any sections Entitled "Dedications".  You
    must delete all sections Entitled "Endorsements."
    You may make a collection consisting of the Document and other
    documents released under this License, and replace the individual
    copies of this License in the various documents with a single copy
    that is included in the collection, provided that you follow the
    rules of this License for verbatim copying of each of the
    documents in all other respects.
    You may extract a single document from such a collection, and
    distribute it individually under this License, provided you insert
    a copy of this License into the extracted document, and follow
    this License in all other respects regarding verbatim copying of
    that document.
    A compilation of the Document or its derivatives with other
    separate and independent documents or works, in or on a volume of
    a storage or distribution medium, is called an "aggregate" if the
    copyright resulting from the compilation is not used to limit the
    legal rights of the compilation's users beyond what the individual
    works permit.  When the Document is included an aggregate, this
    License does not apply to the other works in the aggregate which
    are not themselves derivative works of the Document.
    If the Cover Text requirement of section 3 is applicable to these
    copies of the Document, then if the Document is less than one half
    of the entire aggregate, the Document's Cover Texts may be placed
    on covers that bracket the Document within the aggregate, or the
    electronic equivalent of covers if the Document is in electronic
    form.  Otherwise they must appear on printed covers that bracket
    the whole aggregate.
    Translation is considered a kind of modification, so you may
    distribute translations of the Document under the terms of section
    4.  Replacing Invariant Sections with translations requires special
    permission from their copyright holders, but you may include
    translations of some or all Invariant Sections in addition to the
    original versions of these Invariant Sections.  You may include a
    translation of this License, and all the license notices in the
    Document, and any Warrany Disclaimers, provided that you also
    include the original English version of this License and the
    original versions of those notices and disclaimers.  In case of a
    disagreement between the translation and the original version of
    this License or a notice or disclaimer, the original version will
    If a section in the Document is Entitled "Acknowledgements",
    "Dedications", or "History", the requirement (section 4) to
    Preserve its Title (section 1) will typically require changing the
    actual title.
    You may not copy, modify, sublicense, or distribute the Document
    except as expressly provided for under this License.  Any other
    attempt to copy, modify, sublicense or distribute the Document is
    void, and will automatically terminate your rights under this
    License.  However, parties who have received copies, or rights,
    from you under this License will not have their licenses
    terminated so long as such parties remain in full compliance.
    The Free Software Foundation may publish new, revised versions of
    the GNU Free Documentation License from time to time.  Such new
    versions will be similar in spirit to the present version, but may
    differ in detail to address new problems or concerns.  See
    Each version of the License is given a distinguishing version
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    that specified version or of any later version that has been
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    Free Software Foundation.
ADDENDUM: How to use this License for your documents
  To use this License in a document you have written, include a copy of
  the License in the document and put the following copyright and license
  notices just after the title page:
      Copyright (C)  YEAR  YOUR NAME.
      Permission is granted to copy, distribute and/or modify this document
      under the terms of the GNU Free Documentation License, Version 1.2
      or any later version published by the Free Software Foundation;
      with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
      A copy of the license is included in the section entitled ``GNU
      Free Documentation License.
  If you have Invariant Sections, Front-Cover Texts and Back-Cover
  Texts, replace the "with...Texts." line with this:
        with the Invariant Sections being LIST THEIR TITLES, with
        the Front-Cover Texts being LIST, and with the Back-Cover Texts
        being LIST.
  If you have Invariant Sections without Cover Texts, or some other
  combination of the three, merge those two alternatives to suit the
  If your document contains nontrivial examples of program code, we
  recommend releasing these examples in parallel under your choice of
  free software license, such as the GNU General Public License, to
  permit their use in free software.