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+GNU Free Documentation License
+
+Version 1.2, November 2002
+
+Copyright (C) 2000,2001,2002 Free Software Foundation, Inc. 51 Franklin St,
+Fifth Floor, Boston, MA 02110-1301 USA
+
+Everyone is permitted to copy and distribute verbatim copies of this license
+document, but changing it is not allowed.
+
+   0. PREAMBLE
+
+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.
+
+   1. APPLICABILITY AND DEFINITIONS
+
+This License applies to any manual or other work, in any medium, that contains
+a notice placed by the copyright holder saying it can be distributed under
+the terms of this License. Such a notice grants a world-wide, royalty-free
+license, unlimited in duration, to use that work under the conditions stated
+herein. The "Document", below, refers to any such manual or work. Any member
+of the public is a licensee, and is addressed as "you". You accept the license
+if you copy, modify or distribute the work in a way requiring permission under
+copyright law.
+
+A "Modified Version" of the Document means any work containing the Document
+or a portion of it, either copied verbatim, or with modifications and/or translated
+into another language.
+
+A "Secondary Section" is a named appendix or a front-matter section of the
+Document that deals exclusively with the relationship of the publishers or
+authors of the Document to the Document's overall subject (or to related matters)
+and contains nothing that could fall directly within that overall subject.
+(Thus, if the Document is in part a textbook of mathematics, a Secondary Section
+may not explain any mathematics.) The relationship could be a matter of historical
+connection with the subject or with related matters, or of legal, commercial,
+philosophical, ethical or political position regarding them.
+
+The "Invariant Sections" are certain Secondary Sections whose titles are designated,
+as being those of Invariant Sections, in the notice that says that the Document
+is released under this License. If a section does not fit the above definition
+of Secondary then it is not allowed to be designated as Invariant. The Document
+may contain zero Invariant Sections. If the Document does not identify any
+Invariant Sections then there are none.
+
+The "Cover Texts" are certain short passages of text that are listed, as Front-Cover
+Texts or Back-Cover Texts, in the notice that says that the Document is released
+under this License. A Front-Cover Text may be at most 5 words, and a Back-Cover
+Text may be at most 25 words.
+
+A "Transparent" copy of the Document means a machine-readable copy, represented
+in a format whose specification is available to the general public, that is
+suitable for revising the document straightforwardly with generic text editors
+or (for images composed of pixels) generic paint programs or (for drawings)
+some widely available drawing editor, and that is suitable for input to text
+formatters or for automatic translation to a variety of formats suitable for
+input to text formatters. A copy made in an otherwise Transparent file format
+whose markup, or absence of markup, has been arranged to thwart or discourage
+subsequent modification by readers is not Transparent. An image format is
+not Transparent if used for any substantial amount of text. A copy that is
+not "Transparent" is called "Opaque".
+
+Examples of suitable formats for Transparent copies include plain ASCII without
+markup, Texinfo input format, LaTeX input format, SGML or XML using a publicly
+available DTD, and standard-conforming simple HTML, PostScript or PDF designed
+for human modification. Examples of transparent image formats include PNG,
+XCF and JPG. Opaque formats include proprietary formats that can be read and
+edited only by proprietary word processors, SGML or XML for which the DTD
+and/or processing tools are not generally available, and the machine-generated
+HTML, PostScript or PDF produced by some word processors for output purposes
+only.
+
+The "Title Page" means, for a printed book, the title page itself, plus such
+following pages as are needed to hold, legibly, the material this License
+requires to appear in the title page. For works in formats which do not have
+any title page as such, "Title Page" means the text near the most prominent
+appearance of the work's title, preceding the beginning of the body of the
+text.
+
+A section "Entitled XYZ" means a named subunit of the Document whose title
+either is precisely XYZ or contains XYZ in parentheses following text that
+translates XYZ in another language. (Here XYZ stands for a specific section
+name mentioned below, such as "Acknowledgements", "Dedications", "Endorsements",
+or "History".) To "Preserve the Title" of such a section when you modify the
+Document means that it remains a section "Entitled XYZ" according to this
+definition.
+
+The Document may include Warranty Disclaimers next to the notice which states
+that this License applies to the Document. These Warranty Disclaimers are
+considered to be included by reference in this License, but only as regards
+disclaiming warranties: any other implication that these Warranty Disclaimers
+may have is void and has no effect on the meaning of this License.
+
+   2. VERBATIM COPYING
+
+You may copy and distribute the Document in any medium, either commercially
+or noncommercially, provided that this License, the copyright notices, and
+the license notice saying this License applies to the Document are reproduced
+in all copies, and that you add no other conditions whatsoever to those of
+this License. You may not use technical measures to obstruct or control the
+reading or further copying of the copies you make or distribute. However,
+you may accept compensation in exchange for copies. If you distribute a large
+enough number of copies you must also follow the conditions in section 3.
+
+You may also lend copies, under the same conditions stated above, and you
+may publicly display copies.
+
+   3. COPYING IN QUANTITY
+
+If you publish printed copies (or copies in media that commonly have printed
+covers) of the Document, numbering more than 100, and the Document's license
+notice requires Cover Texts, you must enclose the copies in covers that carry,
+clearly and legibly, all these Cover Texts: Front-Cover Texts on the front
+cover, and Back-Cover Texts on the back cover. Both covers must also clearly
+and legibly identify you as the publisher of these copies. The front cover
+must present the full title with all words of the title equally prominent
+and visible. You may add other material on the covers in addition. Copying
+with changes limited to the covers, as long as they preserve the title of
+the Document and satisfy these conditions, can be treated as verbatim copying
+in other respects.
+
+If the required texts for either cover are too voluminous to fit legibly,
+you should put the first ones listed (as many as fit reasonably) on the actual
+cover, and continue the rest onto adjacent pages.
+
+If you publish or distribute Opaque copies of the Document numbering more
+than 100, you must either include a machine-readable Transparent copy along
+with each Opaque copy, or state in or with each Opaque copy a computer-network
+location from which the general network-using public has access to download
+using public-standard network protocols a complete Transparent copy of the
+Document, free of added material. If you use the latter option, you must take
+reasonably prudent steps, when you begin distribution of Opaque copies in
+quantity, to ensure that this Transparent copy will remain thus accessible
+at the stated location until at least one year after the last time you distribute
+an Opaque copy (directly or through your agents or retailers) of that edition
+to the public.
+
+It is requested, but not required, that you contact the authors of the Document
+well before redistributing any large number of copies, to give them a chance
+to provide you with an updated version of the Document.
+
+   4. MODIFICATIONS
+
+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 the Modified Version filling the role of
+the Document, thus 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.
+
+F. Include, immediately after the copyright notices, a license 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 titles.
+
+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 Section.
+
+      O. Preserve any Warranty Disclaimers.
+
+If the Modified Version includes new front-matter sections or appendices that
+qualify as Secondary Sections and contain no material copied from the Document,
+you may at your option designate some or all of these sections as invariant.
+To do this, add their titles to the list of Invariant Sections in the Modified
+Version's license notice. These titles must be distinct from any other section
+titles.
+
+You may add a section Entitled "Endorsements", provided it contains nothing
+but endorsements of your Modified Version by various parties--for example,
+statements of peer review or that the text has been approved by an organization
+as the authoritative definition of a standard.
+
+You may add a passage of up to five words as a Front-Cover Text, and a passage
+of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts
+in the Modified Version. Only one passage of Front-Cover Text and one of Back-Cover
+Text may be added by (or through arrangements made by) any one entity. If
+the Document already includes a cover text for the same cover, previously
+added by you or by arrangement made by the same entity you are acting on behalf
+of, you may not add another; but you may replace the old one, on explicit
+permission from the previous publisher that added the old one.
+
+The author(s) and publisher(s) of the Document do not by this License give
+permission to use their names for publicity for or to assert or imply endorsement
+of any Modified Version.
+
+   5. COMBINING DOCUMENTS
+
+You may combine the Document with other documents released under this License,
+under the terms defined in section 4 above for modified versions, provided
+that you include in the combination all of the Invariant Sections of all of
+the original documents, unmodified, and list them all as Invariant Sections
+of your combined work in its license notice, and that you preserve all their
+Warranty Disclaimers.
+
+The combined work need only contain one copy of this License, and multiple
+identical Invariant Sections may be replaced with a single copy. If there
+are multiple Invariant Sections with the same name but different contents,
+make the title of each such section unique by adding at the end of it, in
+parentheses, the name of the original author or publisher of that section
+if known, or else a unique number. Make the same adjustment to the section
+titles in 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".
+
+   6. COLLECTIONS OF DOCUMENTS
+
+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.
+
+   7. AGGREGATION WITH INDEPENDENT WORKS
+
+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 in 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.
+
+   8. TRANSLATION
+
+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 Warranty
+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 prevail.
+
+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.
+
+   9. TERMINATION
+
+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.
+
+   10. FUTURE REVISIONS OF THIS LICENSE
+
+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 http://www.gnu.org/copyleft/.
+
+Each version of the License is given a distinguishing version number. If the
+Document specifies that a particular numbered version of this License "or
+any later version" applies to it, you have the option of following the terms
+and conditions either of that specified version or of any later version that
+has been published (not as a draft) by the Free Software Foundation. If the
+Document does not specify a version number of this License, you may choose
+any version ever published (not as a draft) by the 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 situation.
+
+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.