Valid-License-Identifier: CC-BY-SA-4.0
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  license put the following SPDX tag/value pair into a comment according to
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Creative Commons Attribution-ShareAlike 4.0 International

Creative Commons Corporation ("Creative Commons") is not a law firm and
does not provide legal services or legal advice. Distribution of Creative
Commons public licenses does not create a lawyer-client or other
relationship. Creative Commons makes its licenses and related information
available on an "as-is" basis. Creative Commons gives no warranties
regarding its licenses, any material licensed under their terms and
conditions, or any related information. Creative Commons disclaims all
liability for damages resulting from their use to the fullest extent
possible.

Using Creative Commons Public Licenses

Creative Commons public licenses provide a standard set of terms and
conditions that creators and other rights holders may use to share original
works of authorship and other material subject to copyright and certain
other rights specified in the public license below. The following
considerations are for informational purposes only, are not exhaustive, and
do not form part of our licenses.

Considerations for licensors: Our public licenses are intended for use by
those authorized to give the public permission to use material in ways
otherwise restricted by copyright and certain other rights. Our licenses
are irrevocable. Licensors should read and understand the terms and
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also secure all rights necessary before applying our licenses so that the
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any material not subject to the license. This includes other CC-licensed
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wiki.creativecommons.org/Considerations_for_licensors

Considerations for the public: By using one of our public licenses, a
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material may still be restricted for other reasons, including because
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special requests, such as asking that all changes be marked or described.

Although not required by our licenses, you are encouraged to respect those
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Creative Commons Attribution-ShareAlike 4.0 International Public License

By exercising the Licensed Rights (defined below), You accept and agree to
be bound by the terms and conditions of this Creative Commons
Attribution-ShareAlike 4.0 International Public License ("Public
License"). To the extent this Public License may be interpreted as a
contract, You are granted the Licensed Rights in consideration of Your
acceptance of these terms and conditions, and the Licensor grants You such
rights in consideration of benefits the Licensor receives from making the
Licensed Material available under these terms and conditions.

Section 1 - Definitions.

    a. Adapted Material means material subject to Copyright and Similar
       Rights that is derived from or based upon the Licensed Material and
       in which the Licensed Material is translated, altered, arranged,
       transformed, or otherwise modified in a manner requiring permission
       under the Copyright and Similar Rights held by the Licensor. For
       purposes of this Public License, where the Licensed Material is a
       musical work, performance, or sound recording, Adapted Material is
       always produced where the Licensed Material is synched in timed
       relation with a moving image.

    b. Adapter's License means the license You apply to Your Copyright and
       Similar Rights in Your contributions to Adapted Material in
       accordance with the terms and conditions of this Public License.

    c. BY-SA Compatible License means a license listed at
       creativecommons.org/compatiblelicenses, approved by Creative Commons
       as essentially the equivalent of this Public License.

    d. Copyright and Similar Rights means copyright and/or similar rights
       closely related to copyright including, without limitation,
       performance, broadcast, sound recording, and Sui Generis Database
       Rights, without regard to how the rights are labeled or
       categorized. For purposes of this Public License, the rights
       specified in Section 2(b)(1)-(2) are not Copyright and Similar
       Rights.

    e. Effective Technological Measures means those measures that, in the
       absence of proper authority, may not be circumvented under laws
       fulfilling obligations under Article 11 of the WIPO Copyright Treaty
       adopted on December 20, 1996, and/or similar international
       agreements.

    f. Exceptions and Limitations means fair use, fair dealing, and/or any
       other exception or limitation to Copyright and Similar Rights that
       applies to Your use of the Licensed Material.

    g. License Elements means the license attributes listed in the name of
       a Creative Commons Public License. The License Elements of this
       Public License are Attribution and ShareAlike.

    h. Licensed Material means the artistic or literary work, database, or
       other material to which the Licensor applied this Public License.

    i. Licensed Rights means the rights granted to You subject to the terms
       and conditions of this Public License, which are limited to all
       Copyright and Similar Rights that apply to Your use of the Licensed
       Material and that the Licensor has authority to license.

    j. Licensor means the individual(s) or entity(ies) granting rights
       under this Public License.

    k. Share means to provide material to the public by any means or
       process that requires permission under the Licensed Rights, such as
       reproduction, public display, public performance, distribution,
       dissemination, communication, or importation, and to make material
       available to the public including in ways that members of the public
       may access the material from a place and at a time individually
       chosen by them.

    l. Sui Generis Database Rights means rights other than copyright
       resulting from Directive 96/9/EC of the European Parliament and of
       the Council of 11 March 1996 on the legal protection of databases,
       as amended and/or succeeded, as well as other essentially equivalent
       rights anywhere in the world.  m. You means the individual or entity
       exercising the Licensed Rights under this Public License. Your has a
       corresponding meaning.

Section 2 - Scope.

    a. License grant.

        1. Subject to the terms and conditions of this Public License, the
           Licensor hereby grants You a worldwide, royalty-free,
           non-sublicensable, non-exclusive, irrevocable license to
           exercise the Licensed Rights in the Licensed Material to:

            A. reproduce and Share the Licensed Material, in whole or in part; and

            B. produce, reproduce, and Share Adapted Material.

        2. Exceptions and Limitations. For the avoidance of doubt, where
           Exceptions and Limitations apply to Your use, this Public
           License does not apply, and You do not need to comply with its
           terms and conditions.

        3. Term. The term of this Public License is specified in Section 6(a).

        4. Media and formats; technical modifications allowed. The Licensor
           authorizes You to exercise the Licensed Rights in all media and
           formats whether now known or hereafter created, and to make
           technical modifications necessary to do so. The Licensor waives
           and/or agrees not to assert any right or authority to forbid You
           from making technical modifications necessary to exercise the
           Licensed Rights, including technical modifications necessary to
           circumvent Effective Technological Measures. For purposes of
           this Public License, simply making modifications authorized by
           this Section 2(a)(4) never produces Adapted Material.

        5. Downstream recipients.

            A. Offer from the Licensor - Licensed Material. Every recipient
               of the Licensed Material automatically receives an offer
               from the Licensor to exercise the Licensed Rights under the
               terms and conditions of this Public License.

            B. Additional offer from the Licensor - Adapted Material. Every
               recipient of Adapted Material from You automatically
               receives an offer from the Licensor to exercise the Licensed
               Rights in the Adapted Material under the conditions of the
               Adapter's License You apply.

            C. No downstream restrictions. You may not offer or impose any
               additional or different terms or conditions on, or apply any
               Effective Technological Measures to, the Licensed Material
               if doing so restricts exercise of the Licensed Rights by any
               recipient of the Licensed Material.

        6. No endorsement. Nothing in this Public License constitutes or
           may be construed as permission to assert or imply that You are,
           or that Your use of the Licensed Material is, connected with, or
           sponsored, endorsed, or granted official status by, the Licensor
           or others designated to receive attribution as provided in
           Section 3(a)(1)(A)(i).

    b. Other rights.

        1. Moral rights, such as the right of integrity, are not licensed
           under this Public License, nor are publicity, privacy, and/or
           other similar personality rights; however, to the extent
           possible, the Licensor waives and/or agrees not to assert any
           such rights held by the Licensor to the limited extent necessary
           to allow You to exercise the Licensed Rights, but not otherwise.

        2. Patent and trademark rights are not licensed under this Public
           License.

        3. To the extent possible, the Licensor waives any right to collect
           royalties from You for the exercise of the Licensed Rights,
           whether directly or through a collecting society under any
           voluntary or waivable statutory or compulsory licensing
           scheme. In all other cases the Licensor expressly reserves any
           right to collect such royalties.

Section 3 - License Conditions.

Your exercise of the Licensed Rights is expressly made subject to the
following conditions.

    a. Attribution.

        1. If You Share the Licensed Material (including in modified form),
           You must:

            A. retain the following if it is supplied by the Licensor with
               the Licensed Material:

                i. identification of the creator(s) of the Licensed
                   Material and any others designated to receive
                   attribution, in any reasonable manner requested by the
                   Licensor (including by pseudonym if designated);

                ii. a copyright notice;

                iii. a notice that refers to this Public License;

                iv. a notice that refers to the disclaimer of warranties;

                v. a URI or hyperlink to the Licensed Material to the extent reasonably practicable;

            B. indicate if You modified the Licensed Material and retain an
               indication of any previous modifications; and

            C. indicate the Licensed Material is licensed under this Public
            License, and include the text of, or the URI or hyperlink to,
            this Public License.

        2. You may satisfy the conditions in Section 3(a)(1) in any
           reasonable manner based on the medium, means, and context in
           which You Share the Licensed Material. For example, it may be
           reasonable to satisfy the conditions by providing a URI or
           hyperlink to a resource that includes the required information.

        3. If requested by the Licensor, You must remove any of the
           information required by Section 3(a)(1)(A) to the extent
           reasonably practicable.  b. ShareAlike.In addition to the
           conditions in Section 3(a), if You Share Adapted Material You
           produce, the following conditions also apply.

           1. The Adapter's License You apply must be a Creative Commons
              license with the same License Elements, this version or
              later, or a BY-SA Compatible License.

           2. You must include the text of, or the URI or hyperlink to, the
              Adapter's License You apply. You may satisfy this condition
              in any reasonable manner based on the medium, means, and
              context in which You Share Adapted Material.

           3. You may not offer or impose any additional or different terms
              or conditions on, or apply any Effective Technological
              Measures to, Adapted Material that restrict exercise of the
              rights granted under the Adapter's License You apply.

Section 4 - Sui Generis Database Rights.

Where the Licensed Rights include Sui Generis Database Rights that apply to
Your use of the Licensed Material:

    a. for the avoidance of doubt, Section 2(a)(1) grants You the right to
       extract, reuse, reproduce, and Share all or a substantial portion of
       the contents of the database;

    b. if You include all or a substantial portion of the database contents
       in a database in which You have Sui Generis Database Rights, then
       the database in which You have Sui Generis Database Rights (but not
       its individual contents) is Adapted Material, including for purposes
       of Section 3(b); and

    c. You must comply with the conditions in Section 3(a) if You Share all
       or a substantial portion of the contents of the database.

    For the avoidance of doubt, this Section 4 supplements and does not
    replace Your obligations under this Public License where the Licensed
    Rights include other Copyright and Similar Rights.

Section 5 - Disclaimer of Warranties and Limitation of Liability.

    a. Unless otherwise separately undertaken by the Licensor, to the
       extent possible, the Licensor offers the Licensed Material as-is and
       as-available, and makes no representations or warranties of any kind
       concerning the Licensed Material, whether express, implied,
       statutory, or other. This includes, without limitation, warranties
       of title, merchantability, fitness for a particular purpose,
       non-infringement, absence of latent or other defects, accuracy, or
       the presence or absence of errors, whether or not known or
       discoverable. Where disclaimers of warranties are not allowed in
       full or in part, this disclaimer may not apply to You.

    b. To the extent possible, in no event will the Licensor be liable to
       You on any legal theory (including, without limitation, negligence)
       or otherwise for any direct, special, indirect, incidental,
       consequential, punitive, exemplary, or other losses, costs,
       expenses, or damages arising out of this Public License or use of
       the Licensed Material, even if the Licensor has been advised of the
       possibility of such losses, costs, expenses, or damages. Where a
       limitation of liability is not allowed in full or in part, this
       limitation may not apply to You.

    c. The disclaimer of warranties and limitation of liability provided
       above shall be interpreted in a manner that, to the extent possible,
       most closely approximates an absolute disclaimer and waiver of all
       liability.

Section 6 - Term and Termination.

    a. This Public License applies for the term of the Copyright and
       Similar Rights licensed here. However, if You fail to comply with
       this Public License, then Your rights under this Public License
       terminate automatically.

    b. Where Your right to use the Licensed Material has terminated under
       Section 6(a), it reinstates:

        1. automatically as of the date the violation is cured, provided it
           is cured within 30 days of Your discovery of the violation; or

        2. upon express reinstatement by the Licensor.

    c. For the avoidance of doubt, this Section 6(b) does not affect any
       right the Licensor may have to seek remedies for Your violations of
       this Public License.

    d. For the avoidance of doubt, the Licensor may also offer the Licensed
       Material under separate terms or conditions or stop distributing the
       Licensed Material at any time; however, doing so will not terminate
       this Public License.

    e. Sections 1, 5, 6, 7, and 8 survive termination of this Public License.

Section 7 - Other Terms and Conditions.

    a. The Licensor shall not be bound by any additional or different terms
       or conditions communicated by You unless expressly agreed.

    b. Any arrangements, understandings, or agreements regarding the
       Licensed Material not stated herein are separate from and
       independent of the terms and conditions of this Public License.

Section 8 - Interpretation.

    a. For the avoidance of doubt, this Public License does not, and shall
       not be interpreted to, reduce, limit, restrict, or impose conditions
       on any use of the Licensed Material that could lawfully be made
       without permission under this Public License.

    b. To the extent possible, if any provision of this Public License is
       deemed unenforceable, it shall be automatically reformed to the
       minimum extent necessary to make it enforceable. If the provision
       cannot be reformed, it shall be severed from this Public License
       without affecting the enforceability of the remaining terms and
       conditions.

    c. No term or condition of this Public License will be waived and no
       failure to comply consented to unless expressly agreed to by the
       Licensor.

    d. Nothing in this Public License constitutes or may be interpreted as
       a limitation upon, or waiver of, any privileges and immunities that
       apply to the Licensor or You, including from the legal processes of
       any jurisdiction or authority.

Creative Commons is not a party to its public licenses. Notwithstanding,
Creative Commons may elect to apply one of its public licenses to material
it publishes and in those instances will be considered the "Licensor." The
text of the Creative Commons public licenses is dedicated to the public
domain under the CC0 Public Domain Dedication. Except for the limited
purpose of indicating that material is shared under a Creative Commons
public license or as otherwise permitted by the Creative Commons policies
published at creativecommons.org/policies, Creative Commons does not
authorize the use of the trademark "Creative Commons" or any other
trademark or logo of Creative Commons without its prior written consent
including, without limitation, in connection with any unauthorized
modifications to any of its public licenses or any other arrangements,
understandings, or agreements concerning use of licensed material. For the
avoidance of doubt, this paragraph does not form part of the public
licenses.

Creative Commons may be contacted at creativecommons.org.