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 GNU General Public License
                         Version 3, 29 June 2007
      Copyright (C) 2007 Free Software Foundation, Inc. <>
      Everyone is permitted to copy and distribute verbatim copies of this
      license document, but changing it is not allowed.
 The GNU General Public License is a free, copyleft license for software
 and other kinds of works.
    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.
    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
 them if you wish), that you receive source code or can get it if you
 want it, that you can change the software or use pieces of it in new
 free programs, and that you know you can do these things.
    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.
    For example, if you distribute copies of such a program, whether
 gratis or for a fee, you must pass on to the recipients the same
 freedoms that you received.  You must make sure that they, too, receive
 or can get the source code.  And you must show them these terms so they
 know their rights.
    Developers that use the GNU GPL protect your rights with two steps:
 (1) assert copyright on the software, and (2) offer you this License
 giving you legal permission to copy, distribute and/or modify it.
    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
 authors of previous versions.
    Some devices are designed to deny users access to install or run
 modified versions of the software inside them, although the manufacturer
 can do so.  This is fundamentally incompatible with the aim of
 protecting users' freedom to change the software.  The systematic
 pattern of such abuse occurs in the area of products for individuals to
 use, which is precisely where it is most unacceptable.  Therefore, we
 have designed this version of the GPL to prohibit the practice for those
 products.  If such problems arise substantially in other domains, we
 stand ready to extend this provision to those domains in future versions
 of the GPL, as needed to protect the freedom of users.
    Finally, every program is threatened constantly by software patents.
 States should not allow patents to restrict development and use of
 software on general-purpose computers, but in those that do, we wish to
 avoid the special danger that patents applied to a free program could
 make it effectively proprietary.  To prevent this, the GPL assures that
 patents cannot be used to render the program non-free.
    The precise terms and conditions for copying, distribution and
 modification follow.
   0. Definitions.
      "This License" refers to version 3 of the GNU General Public
      "Copyright" also means copyright-like laws that apply to other
      kinds of works, such as semiconductor masks.
      "The Program" refers to any copyrightable work licensed under this
      License.  Each licensee is addressed as "you".  "Licensees" and
      "recipients" may be individuals or organizations.
      To "modify" a work means to copy from or adapt all or part of the
      work in a fashion requiring copyright permission, other than the
      making of an exact copy.  The resulting work is called a "modified
      version" of the earlier work or a work "based on" the earlier work.
      A "covered work" means either the unmodified Program or a work
      based on the Program.
      To "propagate" a work means to do anything with it that, without
      permission, would make you directly or secondarily liable for
      infringement under applicable copyright law, except executing it on
      a computer or modifying a private copy.  Propagation includes
      copying, distribution (with or without modification), making
      available to the public, and in some countries other activities as
      To "convey" a work means any kind of propagation that enables other
      parties to make or receive copies.  Mere interaction with a user
      through a computer network, with no transfer of a copy, is not
      An interactive user interface displays "Appropriate Legal Notices"
      to the extent that it includes a convenient and prominently visible
      feature that (1) displays an appropriate copyright notice, and (2)
      tells the user that there is no warranty for the work (except to
      the extent that warranties are provided), that licensees may convey
      the work under this License, and how to view a copy of this
      License.  If the interface presents a list of user commands or
      options, such as a menu, a prominent item in the list meets this
   1. Source Code.
      The "source code" for a work means the preferred form of the work
      for making modifications to it.  "Object code" means any non-source
      form of a work.
      A "Standard Interface" means an interface that either is an
      official standard defined by a recognized standards body, or, in
      the case of interfaces specified for a particular programming
      language, one that is widely used among developers working in that
      The "System Libraries" of an executable work include anything,
      other than the work as a whole, that (a) is included in the normal
      form of packaging a Major Component, but which is not part of that
      Major Component, and (b) serves only to enable use of the work with
      that Major Component, or to implement a Standard Interface for
      which an implementation is available to the public in source code
      form.  A "Major Component", in this context, means a major
      essential component (kernel, window system, and so on) of the
      specific operating system (if any) on which the executable work
      runs, or a compiler used to produce the work, or an object code
      interpreter used to run it.
      The "Corresponding Source" for a work in object code form means all
      the source code needed to generate, install, and (for an executable
      work) run the object code and to modify the work, including scripts
      to control those activities.  However, it does not include the
      work's System Libraries, or general-purpose tools or generally
      available free programs which are used unmodified in performing
      those activities but which are not part of the work.  For example,
      Corresponding Source includes interface definition files associated
      with source files for the work, and the source code for shared
      libraries and dynamically linked subprograms that the work is
      specifically designed to require, such as by intimate data
      communication or control flow between those subprograms and other
      parts of the work.
      The Corresponding Source need not include anything that users can
      regenerate automatically from other parts of the Corresponding
      The Corresponding Source for a work in source code form is that
      same work.
   2. Basic Permissions.
      All rights granted under this License are granted for the term of
      copyright on the Program, and are irrevocable provided the stated
      conditions are met.  This License explicitly affirms your unlimited
      permission to run the unmodified Program.  The output from running
      a covered work is covered by this License only if the output, given
      its content, constitutes a covered work.  This License acknowledges
      your rights of fair use or other equivalent, as provided by
      copyright law.
      You may make, run and propagate covered works that you do not
      convey, without conditions so long as your license otherwise
      remains in force.  You may convey covered works to others for the
      sole purpose of having them make modifications exclusively for you,
      or provide you with facilities for running those works, provided
      that you comply with the terms of this License in conveying all
      material for which you do not control copyright.  Those thus making
      or running the covered works for you must do so exclusively on your
      behalf, under your direction and control, on terms that prohibit
      them from making any copies of your copyrighted material outside
      their relationship with you.
      Conveying under any other circumstances is permitted solely under
      the conditions stated below.  Sublicensing is not allowed; section
      10 makes it unnecessary.
   3. Protecting Users' Legal Rights From Anti-Circumvention Law.
      No covered work shall be deemed part of an effective technological
      measure under any applicable law fulfilling obligations under
      article 11 of the WIPO copyright treaty adopted on 20 December
      1996, or similar laws prohibiting or restricting circumvention of
      such measures.
      When you convey a covered work, you waive any legal power to forbid
      circumvention of technological measures to the extent such
      circumvention is effected by exercising rights under this License
      with respect to the covered work, and you disclaim any intention to
      limit operation or modification of the work as a means of
      enforcing, against the work's users, your or third parties' legal
      rights to forbid circumvention of technological measures.
   4. Conveying Verbatim Copies.
      You may convey verbatim copies of the Program's source code as you
      receive it, in any medium, provided that you conspicuously and
      appropriately publish on each copy an appropriate copyright notice;
      keep intact all notices stating that this License and any
      non-permissive terms added in accord with section 7 apply to the
      code; keep intact all notices of the absence of any warranty; and
      give all recipients a copy of this License along with the Program.
      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.
   5. Conveying Modified Source Versions.
      You may convey a work based on the Program, or the modifications to
      produce it from the Program, in the form of source code under the
      terms of section 4, provided that you also meet all of these
        a. The work must carry prominent notices stating that you
           modified it, and giving a relevant date.
        b. The work must carry prominent notices stating that it is
           released under this License and any conditions added under
           section 7.  This requirement modifies the requirement in
           section 4 to "keep intact all notices".
        c. You must license the entire work, as a whole, under this
           License to anyone who comes into possession of a copy.  This
           License will therefore apply, along with any applicable
           section 7 additional terms, to the whole of the work, and all
           its parts, regardless of how they are packaged.  This License
           gives no permission to license the work in any other way, but
           it does not invalidate such permission if you have separately
           received it.
        d. If the work has interactive user interfaces, each must display
           Appropriate Legal Notices; however, if the Program has
           interactive interfaces that do not display Appropriate Legal
           Notices, your work need not make them do so.
      A compilation of a covered work with other separate and independent
      works, which are not by their nature extensions of the covered
      work, and which are not combined with it such as to form a larger
      program, in or on a volume of a storage or distribution medium, is
      called an "aggregate" if the compilation and its resulting
      copyright are not used to limit the access or legal rights of the
      compilation's users beyond what the individual works permit.
      Inclusion of a covered work in an aggregate does not cause this
      License to apply to the other parts of the aggregate.
   6. Conveying Non-Source Forms.
      You may convey a covered work in object code form under the terms
      of sections 4 and 5, provided that you also convey the
      machine-readable Corresponding Source under the terms of this
      License, in one of these ways:
        a. Convey the object code in, or embodied in, a physical product
           (including a physical distribution medium), accompanied by the
           Corresponding Source fixed on a durable physical medium
           customarily used for software interchange.
        b. Convey the object code in, or embodied in, a physical product
           (including a physical distribution medium), accompanied by a
           written offer, valid for at least three years and valid for as
           long as you offer spare parts or customer support for that
           product model, to give anyone who possesses the object code
           either (1) a 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
        c. Convey individual copies of the object code with a copy of the
           written offer to provide the Corresponding Source.  This
           alternative is allowed only occasionally and noncommercially,
           and only if you received the object code with such an offer,
           in accord with subsection 6b.
        d. Convey the object code by offering access from a designated
           place (gratis or for a charge), and offer equivalent access to
           the Corresponding Source in the same way through the same
           place at no further charge.  You need not require recipients
           to copy the Corresponding Source along with the object code.
           If the place to copy the object code is a network server, the
           Corresponding Source may be on a different server (operated by
           you or a third party) that supports equivalent copying
           facilities, provided you maintain clear directions next to the
           object code saying where to find the Corresponding Source.
           Regardless of what server hosts the Corresponding Source, you
           remain obligated to ensure that it is available for as long as
           needed to satisfy these requirements.
        e. Convey the object code using peer-to-peer transmission,
           provided you inform other peers where the object code and
           Corresponding Source of the work are being offered to the
           general public at no charge under subsection 6d.
      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.
      A "User Product" is either (1) a "consumer product", which means
      any tangible personal property which is normally used for personal,
      family, or household purposes, or (2) anything designed or sold for
      incorporation into a dwelling.  In determining whether a product is
      a consumer product, doubtful cases shall be resolved in favor of
      coverage.  For a particular product received by a particular user,
      "normally used" refers to a typical or common use of that class of
      product, regardless of the status of the particular user or of the
      way in which the particular user actually uses, or expects or is
      expected to use, the product.  A product is a consumer product
      regardless of whether the product has substantial commercial,
      industrial or non-consumer uses, unless such uses represent the
      only significant mode of use of the product.
      "Installation Information" for a User Product means any methods,
      procedures, authorization keys, or other information required to
      install and execute modified versions of a covered work in that
      User Product from a modified version of its Corresponding Source.
      The information must suffice to ensure that the continued
      functioning of the modified object code is in no case prevented or
      interfered with solely because modification has been made.
      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 part of a transaction in which the right of possession
      and use of the User Product is transferred to the recipient in
      perpetuity or for a fixed term (regardless of how the transaction
      is characterized), the Corresponding Source conveyed under this
      section must be accompanied by the Installation Information.  But
      this requirement does not apply 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).
      The requirement to provide Installation Information does not
      include a requirement to continue to provide support service,
      warranty, or updates for a work that has been modified or installed
      by the recipient, or for the User Product in which it has been
      modified or installed.  Access to a 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.
      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.
   7. Additional Terms.
      "Additional permissions" 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.
      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.
      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
        a. Disclaiming warranty or limiting liability differently from
           the terms of sections 15 and 16 of this License; or
        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
        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
        d. Limiting the use for publicity purposes of names of licensors
           or authors of the material; or
        e. Declining to grant rights under trademark law for use of some
           trade names, trademarks, or service marks; or
        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.
      All other non-permissive additional terms are considered "further
      restrictions" 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.
      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.
      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.
   8. Termination.
      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).
      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.
      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.
      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.
   9. Acceptance Not Required for Having Copies.
      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.
   10. Automatic Licensing of Downstream Recipients.
      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
      An "entity transaction" 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
      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.
   11. Patents.
      A "contributor" 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 "contributor
      A contributor's "essential patent claims" 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, "control"
      includes the right to grant patent sublicenses in a manner
      consistent with the requirements of this License.
      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
      In the following three paragraphs, a "patent license" 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 "grant"
      such a patent license to a party means to make such an agreement or
      commitment not to enforce a patent against the party.
      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.  "Knowingly relying" 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.
      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.
      A patent license is "discriminatory" 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.
      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.
   12. No Surrender of Others' Freedom.
      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.
   13. Use with the GNU Affero General Public License.
      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.
   14. Revised Versions of this License.
      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.
      Each version is given a distinguishing version number.  If the
      Program specifies that a certain numbered version of the GNU
      General Public License "or any later version" 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.
      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.
      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.
   15. Disclaimer of Warranty.
   16. Limitation of Liability.
   17. Interpretation of Sections 15 and 16.
      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.
 How to Apply These Terms to Your New Programs
 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
    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
 "copyright" line and a pointer to where the full notice is found.
      Copyright (C) YEAR NAME OF AUTHOR
      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
      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 <>.
    Also add information on how to contact you by electronic and paper
    If the program does terminal interaction, make it output a short
 notice like this when it starts in an interactive mode:
      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.
    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 "about box".
    You should also get your employer (if you work as a programmer) or
 school, if any, to sign a "copyright disclaimer" for the program, if
 necessary.  For more information on this, and how to apply and follow
 the GNU GPL, see <>.
    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 <>.
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