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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.