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See http://www.gnu.org/copyleft/.

Each version of the License is given a distinguishing version number. If the Document
speci¬es 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
speci¬ed 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 Documenta-
tion 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.

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