<sect1 id="licenses-gfdl-section-6" xreflabel="Combining documents">

    <title>Combining documents</title>

    <para>You may combine the Document with other documents released

    under this License, under the terms defined in section 

    linkend="licenses-gfdl-section-5" /> 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.</para>

    <para>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.</para>

    <para>In the combination, you must combine any sections Entitled

    <quote>History</quote> in the various original documents, forming

    one section Entitled <quote>History</quote>; likewise combine any

    sections Entitled <quote>Acknowledgements</quote>, and any

    sections Entitled <quote>Dedications</quote>.  You must delete all

    sections Entitled <quote>Endorsements</quote>.</para>

</sect1>