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      <h3 style="text-align: center;">GNU GENERAL PUBLIC LICENSE</h3>
      <p style="text-align: center;">Version 3, 29 June 2007</p>

      <p>Copyright &copy; 2007 Free Software Foundation, Inc.
        &lt;<a href="https://fsf.org/">https://fsf.org/</a>&gt;</p><p>
        Everyone is permitted to copy and distribute verbatim copies
        of this license document, but changing it is not allowed.</p>

      <h3><a name="preamble"></a>Preamble</h3>

      <p>The GNU General Public License is a free, copyleft license for
        software and other kinds of works.</p>

      <p>The licenses for most software and other practical works are designed
        to take away your freedom to share and change the works.  By contrast,
        the GNU General Public License is intended to guarantee your freedom to
        share and change all versions of a program--to make sure it remains free
        software for all its users.  We, the Free Software Foundation, use the
        GNU General Public License for most of our software; it applies also to
        any other work released this way by its authors.  You can apply it to
        your programs, too.</p>

      <p>When we speak of free software, we are referring to freedom, not
        price.  Our General Public Licenses are designed to make sure that you
        have the freedom to distribute copies of free software (and charge for
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        free programs, and that you know you can do these things.</p>

      <p>To protect your rights, we need to prevent others from denying you
        these rights or asking you to surrender the rights.  Therefore, you have
        certain responsibilities if you distribute copies of the software, or if
        you modify it: responsibilities to respect the freedom of others.</p>

      <p>For example, if you distribute copies of such a program, whether
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        know their rights.</p>

      <p>Developers that use the GNU GPL protect your rights with two steps:
        (1) assert copyright on the software, and (2) offer you this License
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      <p>For the developers' and authors' protection, the GPL clearly explains
        that there is no warranty for this free software.  For both users' and
        authors' sake, the GPL requires that modified versions be marked as
        changed, so that their problems will not be attributed erroneously to
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      <p>Some devices are designed to deny users access to install or run
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        stand ready to extend this provision to those domains in future versions
        of the GPL, as needed to protect the freedom of users.</p>

      <p>Finally, every program is threatened constantly by software patents.
        States should not allow patents to restrict development and use of
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        avoid the special danger that patents applied to a free program could
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      <p>The precise terms and conditions for copying, distribution and
        modification follow.</p>

      <h3><a name="terms"></a>TERMS AND CONDITIONS</h3>

      <h4><a name="section0"></a>0. Definitions.</h4>

      <p>&ldquo;This License&rdquo; refers to version 3 of the GNU General Public License.</p>

      <p>&ldquo;Copyright&rdquo; also means copyright-like laws that apply to other kinds of
        works, such as semiconductor masks.</p>

      <p>&ldquo;The Program&rdquo; refers to any copyrightable work licensed under this
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      <p>To &ldquo;propagate&rdquo; a work means to do anything with it that, without
        permission, would make you directly or secondarily liable for
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        public, and in some countries other activities as well.</p>

      <p>To &ldquo;convey&rdquo; a work means any kind of propagation that enables other
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      <p>An interactive user interface displays &ldquo;Appropriate Legal Notices&rdquo;
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        menu, a prominent item in the list meets this criterion.</p>

      <h4><a name="section1"></a>1. Source Code.</h4>

      <p>The &ldquo;source code&rdquo; for a work means the preferred form of the work
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      <p>The &ldquo;Corresponding Source&rdquo; for a work in object code form means all
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      <h4><a name="section2"></a>2. Basic Permissions.</h4>

      <p>All rights granted under this License are granted for the term of
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      <p>You may make, run and propagate covered works that you do not
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      <p>Conveying under any other circumstances is permitted solely under
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      <h4><a name="section3"></a>3. Protecting Users' Legal Rights From Anti-Circumvention Law.</h4>

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      <h4><a name="section4"></a>4. Conveying Verbatim Copies.</h4>

      <p>You may convey verbatim copies of the Program's source code as you
        receive it, in any medium, provided that you conspicuously and
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        keep intact all notices of the absence of any warranty; and give all
        recipients a copy of this License along with the Program.</p>

      <p>You may charge any price or no price for each copy that you convey,
        and you may offer support or warranty protection for a fee.</p>

      <h4><a name="section5"></a>5. Conveying Modified Source Versions.</h4>

      <p>You may convey a work based on the Program, or the modifications to
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      <ul>
        <li>a) The work must carry prominent notices stating that you modified
          it, and giving a relevant date.</li>

        <li>b) The work must carry prominent notices stating that it is
          released under this License and any conditions added under section
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          &ldquo;keep intact all notices&rdquo;.</li>

        <li>c) You must license the entire work, as a whole, under this
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      <h4><a name="section6"></a>6. Conveying Non-Source Forms.</h4>

      <p>You may convey a covered work in object code form under the terms
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        in one of these ways:</p>

      <ul>
        <li>a) Convey the object code in, or embodied in, a physical product
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        <li>b) Convey the object code in, or embodied in, a physical product
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          copy of the Corresponding Source for all the software in the
          product that is covered by this License, on a durable physical
          medium customarily used for software interchange, for a price no
          more than your reasonable cost of physically performing this
          conveying of source, or (2) access to copy the
          Corresponding Source from a network server at no charge.</li>

        <li>c) Convey individual copies of the object code with a copy of the
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        <li>d) Convey the object code by offering access from a designated
          place (gratis or for a charge), and offer equivalent access to the
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          that supports equivalent copying facilities, provided you maintain
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        <li>e) Convey the object code using peer-to-peer transmission, provided
          you inform other peers where the object code and Corresponding
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          charge under subsection 6d.</li>
      </ul>

      <p>A separable portion of the object code, whose source code is excluded
        from the Corresponding Source as a System Library, need not be
        included in conveying the object code work.</p>

      <p>A &ldquo;User Product&rdquo; is either (1) a &ldquo;consumer product&rdquo;, which means any
        tangible personal property which is normally used for personal, family,
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        typical or common use of that class of product, regardless of the status
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      <p>&ldquo;Installation Information&rdquo; for a User Product means any methods,
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      <p>If you convey an object code work under this section in, or with, or
        specifically for use in, a User Product, and the conveying occurs as
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        if neither you nor any third party retains the ability to install
        modified object code on the User Product (for example, the work has
        been installed in ROM).</p>

      <p>The requirement to provide Installation Information does not include a
        requirement to continue to provide support service, warranty, or updates
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        network may be denied when the modification itself materially and
        adversely affects the operation of the network or violates the rules and
        protocols for communication across the network.</p>

      <p>Corresponding Source conveyed, and Installation Information provided,
        in accord with this section must be in a format that is publicly
        documented (and with an implementation available to the public in
        source code form), and must require no special password or key for
        unpacking, reading or copying.</p>

      <h4><a name="section7"></a>7. Additional Terms.</h4>

      <p>&ldquo;Additional permissions&rdquo; are terms that supplement the terms of this
        License by making exceptions from one or more of its conditions.
        Additional permissions that are applicable to the entire Program shall
        be treated as though they were included in this License, to the extent
        that they are valid under applicable law.  If additional permissions
        apply only to part of the Program, that part may be used separately
        under those permissions, but the entire Program remains governed by
        this License without regard to the additional permissions.</p>

      <p>When you convey a copy of a covered work, you may at your option
        remove any additional permissions from that copy, or from any part of
        it.  (Additional permissions may be written to require their own
        removal in certain cases when you modify the work.)  You may place
        additional permissions on material, added by you to a covered work,
        for which you have or can give appropriate copyright permission.</p>

      <p>Notwithstanding any other provision of this License, for material you
        add to a covered work, you may (if authorized by the copyright holders of
        that material) supplement the terms of this License with terms:</p>

      <ul>
        <li>a) Disclaiming warranty or limiting liability differently from the
          terms of sections 15 and 16 of this License; or</li>

        <li>b) Requiring preservation of specified reasonable legal notices or
          author attributions in that material or in the Appropriate Legal
          Notices displayed by works containing it; or</li>

        <li>c) Prohibiting misrepresentation of the origin of that material, or
          requiring that modified versions of such material be marked in
          reasonable ways as different from the original version; or</li>

        <li>d) Limiting the use for publicity purposes of names of licensors or
          authors of the material; or</li>

        <li>e) Declining to grant rights under trademark law for use of some
          trade names, trademarks, or service marks; or</li>

        <li>f) Requiring indemnification of licensors and authors of that
          material by anyone who conveys the material (or modified versions of
          it) with contractual assumptions of liability to the recipient, for
          any liability that these contractual assumptions directly impose on
          those licensors and authors.</li>
      </ul>

      <p>All other non-permissive additional terms are considered &ldquo;further
        restrictions&rdquo; within the meaning of section 10.  If the Program as you
        received it, or any part of it, contains a notice stating that it is
        governed by this License along with a term that is a further
        restriction, you may remove that term.  If a license document contains
        a further restriction but permits relicensing or conveying under this
        License, you may add to a covered work material governed by the terms
        of that license document, provided that the further restriction does
        not survive such relicensing or conveying.</p>

      <p>If you add terms to a covered work in accord with this section, you
        must place, in the relevant source files, a statement of the
        additional terms that apply to those files, or a notice indicating
        where to find the applicable terms.</p>

      <p>Additional terms, permissive or non-permissive, may be stated in the
        form of a separately written license, or stated as exceptions;
        the above requirements apply either way.</p>

      <h4><a name="section8"></a>8. Termination.</h4>

      <p>You may not propagate or modify a covered work except as expressly
        provided under this License.  Any attempt otherwise to propagate or
        modify it is void, and will automatically terminate your rights under
        this License (including any patent licenses granted under the third
        paragraph of section 11).</p>

      <p>However, if you cease all violation of this License, then your
        license from a particular copyright holder is reinstated (a)
        provisionally, unless and until the copyright holder explicitly and
        finally terminates your license, and (b) permanently, if the copyright
        holder fails to notify you of the violation by some reasonable means
        prior to 60 days after the cessation.</p>

      <p>Moreover, your license from a particular copyright holder is
        reinstated permanently if the copyright holder notifies you of the
        violation by some reasonable means, this is the first time you have
        received notice of violation of this License (for any work) from that
        copyright holder, and you cure the violation prior to 30 days after
        your receipt of the notice.</p>

      <p>Termination of your rights under this section does not terminate the
        licenses of parties who have received copies or rights from you under
        this License.  If your rights have been terminated and not permanently
        reinstated, you do not qualify to receive new licenses for the same
        material under section 10.</p>

      <h4><a name="section9"></a>9. Acceptance Not Required for Having Copies.</h4>

      <p>You are not required to accept this License in order to receive or
        run a copy of the Program.  Ancillary propagation of a covered work
        occurring solely as a consequence of using peer-to-peer transmission
        to receive a copy likewise does not require acceptance.  However,
        nothing other than this License grants you permission to propagate or
        modify any covered work.  These actions infringe copyright if you do
        not accept this License.  Therefore, by modifying or propagating a
        covered work, you indicate your acceptance of this License to do so.</p>

      <h4><a name="section10"></a>10. Automatic Licensing of Downstream Recipients.</h4>

      <p>Each time you convey a covered work, the recipient automatically
        receives a license from the original licensors, to run, modify and
        propagate that work, subject to this License.  You are not responsible
        for enforcing compliance by third parties with this License.</p>

      <p>An &ldquo;entity transaction&rdquo; is a transaction transferring control of an
        organization, or substantially all assets of one, or subdividing an
        organization, or merging organizations.  If propagation of a covered
        work results from an entity transaction, each party to that
        transaction who receives a copy of the work also receives whatever
        licenses to the work the party's predecessor in interest had or could
        give under the previous paragraph, plus a right to possession of the
        Corresponding Source of the work from the predecessor in interest, if
        the predecessor has it or can get it with reasonable efforts.</p>

      <p>You may not impose any further restrictions on the exercise of the
        rights granted or affirmed under this License.  For example, you may
        not impose a license fee, royalty, or other charge for exercise of
        rights granted under this License, and you may not initiate litigation
        (including a cross-claim or counterclaim in a lawsuit) alleging that
        any patent claim is infringed by making, using, selling, offering for
        sale, or importing the Program or any portion of it.</p>

      <h4><a name="section11"></a>11. Patents.</h4>

      <p>A &ldquo;contributor&rdquo; is a copyright holder who authorizes use under this
        License of the Program or a work on which the Program is based.  The
        work thus licensed is called the contributor's &ldquo;contributor version&rdquo;.</p>

      <p>A contributor's &ldquo;essential patent claims&rdquo; are all patent claims
        owned or controlled by the contributor, whether already acquired or
        hereafter acquired, that would be infringed by some manner, permitted
        by this License, of making, using, or selling its contributor version,
        but do not include claims that would be infringed only as a
        consequence of further modification of the contributor version.  For
        purposes of this definition, &ldquo;control&rdquo; includes the right to grant
        patent sublicenses in a manner consistent with the requirements of
        this License.</p>

      <p>Each contributor grants you a non-exclusive, worldwide, royalty-free
        patent license under the contributor's essential patent claims, to
        make, use, sell, offer for sale, import and otherwise run, modify and
        propagate the contents of its contributor version.</p>

      <p>In the following three paragraphs, a &ldquo;patent license&rdquo; is any express
        agreement or commitment, however denominated, not to enforce a patent
        (such as an express permission to practice a patent or covenant not to
        sue for patent infringement).  To &ldquo;grant&rdquo; such a patent license to a
        party means to make such an agreement or commitment not to enforce a
        patent against the party.</p>

      <p>If you convey a covered work, knowingly relying on a patent license,
        and the Corresponding Source of the work is not available for anyone
        to copy, free of charge and under the terms of this License, through a
        publicly available network server or other readily accessible means,
        then you must either (1) cause the Corresponding Source to be so
        available, or (2) arrange to deprive yourself of the benefit of the
        patent license for this particular work, or (3) arrange, in a manner
        consistent with the requirements of this License, to extend the patent
        license to downstream recipients.  &ldquo;Knowingly relying&rdquo; means you have
        actual knowledge that, but for the patent license, your conveying the
        covered work in a country, or your recipient's use of the covered work
        in a country, would infringe one or more identifiable patents in that
        country that you have reason to believe are valid.</p>

      <p>If, pursuant to or in connection with a single transaction or
        arrangement, you convey, or propagate by procuring conveyance of, a
        covered work, and grant a patent license to some of the parties
        receiving the covered work authorizing them to use, propagate, modify
        or convey a specific copy of the covered work, then the patent license
        you grant is automatically extended to all recipients of the covered
        work and works based on it.</p>

      <p>A patent license is &ldquo;discriminatory&rdquo; if it does not include within
        the scope of its coverage, prohibits the exercise of, or is
        conditioned on the non-exercise of one or more of the rights that are
        specifically granted under this License.  You may not convey a covered
        work if you are a party to an arrangement with a third party that is
        in the business of distributing software, under which you make payment
        to the third party based on the extent of your activity of conveying
        the work, and under which the third party grants, to any of the
        parties who would receive the covered work from you, a discriminatory
        patent license (a) in connection with copies of the covered work
        conveyed by you (or copies made from those copies), or (b) primarily
        for and in connection with specific products or compilations that
        contain the covered work, unless you entered into that arrangement,
        or that patent license was granted, prior to 28 March 2007.</p>

      <p>Nothing in this License shall be construed as excluding or limiting
        any implied license or other defenses to infringement that may
        otherwise be available to you under applicable patent law.</p>

      <h4><a name="section12"></a>12. No Surrender of Others' Freedom.</h4>

      <p>If conditions are imposed on you (whether by court order, agreement or
        otherwise) that contradict the conditions of this License, they do not
        excuse you from the conditions of this License.  If you cannot convey a
        covered work so as to satisfy simultaneously your obligations under this
        License and any other pertinent obligations, then as a consequence you may
        not convey it at all.  For example, if you agree to terms that obligate you
        to collect a royalty for further conveying from those to whom you convey
        the Program, the only way you could satisfy both those terms and this
        License would be to refrain entirely from conveying the Program.</p>

      <h4><a name="section13"></a>13. Use with the GNU Affero General Public License.</h4>

      <p>Notwithstanding any other provision of this License, you have
        permission to link or combine any covered work with a work licensed
        under version 3 of the GNU Affero General Public License into a single
        combined work, and to convey the resulting work.  The terms of this
        License will continue to apply to the part which is the covered work,
        but the special requirements of the GNU Affero General Public License,
        section 13, concerning interaction through a network will apply to the
        combination as such.</p>

      <h4><a name="section14"></a>14. Revised Versions of this License.</h4>

      <p>The Free Software Foundation may publish revised and/or new versions of
        the GNU General Public 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.</p>

      <p>Each version is given a distinguishing version number.  If the
        Program specifies that a certain numbered version of the GNU General
        Public License &ldquo;or any later version&rdquo; applies to it, you have the
        option of following the terms and conditions either of that numbered
        version or of any later version published by the Free Software
        Foundation.  If the Program does not specify a version number of the
        GNU General Public License, you may choose any version ever published
        by the Free Software Foundation.</p>

      <p>If the Program specifies that a proxy can decide which future
        versions of the GNU General Public License can be used, that proxy's
        public statement of acceptance of a version permanently authorizes you
        to choose that version for the Program.</p>

      <p>Later license versions may give you additional or different
        permissions.  However, no additional obligations are imposed on any
        author or copyright holder as a result of your choosing to follow a
        later version.</p>

      <h4><a name="section15"></a>15. Disclaimer of Warranty.</h4>

      <p>THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
        APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
        HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM &ldquo;AS IS&rdquo; WITHOUT WARRANTY
        OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
        THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
        IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
        ALL NECESSARY SERVICING, REPAIR OR CORRECTION.</p>

      <h4><a name="section16"></a>16. Limitation of Liability.</h4>

      <p>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
        WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
        THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
        GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
        USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
        DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
        PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
        EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
        SUCH DAMAGES.</p>

      <h4><a name="section17"></a>17. Interpretation of Sections 15 and 16.</h4>

      <p>If the disclaimer of warranty and limitation of liability provided
        above cannot be given local legal effect according to their terms,
        reviewing courts shall apply local law that most closely approximates
        an absolute waiver of all civil liability in connection with the
        Program, unless a warranty or assumption of liability accompanies a
        copy of the Program in return for a fee.</p>

      <p>END OF TERMS AND CONDITIONS</p>

      <h3><a name="howto"></a>How to Apply These Terms to Your New Programs</h3>

      <p>If you develop a new program, and you want it to be of the greatest
        possible use to the public, the best way to achieve this is to make it
        free software which everyone can redistribute and change under these terms.</p>

      <p>To do so, attach the following notices to the program.  It is safest
        to attach them to the start of each source file to most effectively
        state the exclusion of warranty; and each file should have at least
        the &ldquo;copyright&rdquo; line and a pointer to where the full notice is found.</p>

      <pre>    &lt;one line to give the program's name and a brief idea of what it does.&gt;
    Copyright (C) &lt;year&gt;  &lt;name of author&gt;

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;.
      </pre>

      <p>Also add information on how to contact you by electronic and paper mail.</p>

      <p>If the program does terminal interaction, make it output a short
        notice like this when it starts in an interactive mode:</p>

      <pre>    &lt;program&gt;  Copyright (C) &lt;year&gt;  &lt;name of author&gt;
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.
      </pre>

      <p>The hypothetical commands `show w' and `show c' should show the appropriate
        parts of the General Public License.  Of course, your program's commands
        might be different; for a GUI interface, you would use an &ldquo;about box&rdquo;.</p>

      <p>You should also get your employer (if you work as a programmer) or school,
        if any, to sign a &ldquo;copyright disclaimer&rdquo; for the program, if necessary.
        For more information on this, and how to apply and follow the GNU GPL, see
        &lt;<a href="https://www.gnu.org/licenses/">https://www.gnu.org/licenses/</a>&gt;.</p>

      <p>The GNU General Public License does not permit incorporating your program
        into proprietary programs.  If your program is a subroutine library, you
        may consider it more useful to permit linking proprietary applications with
        the library.  If this is what you want to do, use the GNU Lesser General
        Public License instead of this License.  But first, please read
        &lt;<a href="https://www.gnu.org/licenses/why-not-lgpl.html">https://www.gnu.org/licenses/why-not-lgpl.html</a>&gt;.</p>
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