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    <p>I don't have an opinion as I'm not close to this area.   The
      javadoc needs to specify `SecurityException` be thrown if that's
      the design.<br>
    </p>
    <p><br>
      Mandy<br>
    </p>
    <div class="moz-cite-prefix">On 6/1/23 12:53 AM, Adam Sotona wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:CY4PR1001MB21503B8B3B30B5BDB74DB9778C499@CY4PR1001MB2150.namprd10.prod.outlook.com">
      
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        <p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US" lang="EN-US">I understand the benefits having default class
            hierarchy resolver configuration its own privileged access
            to the system class loader, however such “default” probably
            should not be available for external use and even
            JDK-internal use differs case by case. I think it should be
            user responsibility to deal with security manager when
            needed.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US" lang="EN-US">Thanks,<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US" lang="EN-US">Adam<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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          <p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
              </span></b><span style="font-size:12.0pt;color:black">Mandy
              Chung <a class="moz-txt-link-rfc2396E" href="mailto:mandy.chung@oracle.com"><mandy.chung@oracle.com></a><br>
              <b>Date: </b>Thursday, 1 June 2023 2:47<br>
              <b>To: </b><a class="moz-txt-link-abbreviated" href="mailto:liangchenblue@gmail.com">liangchenblue@gmail.com</a>
              <a class="moz-txt-link-rfc2396E" href="mailto:liangchenblue@gmail.com"><liangchenblue@gmail.com></a>, Adam Sotona
              <a class="moz-txt-link-rfc2396E" href="mailto:adam.sotona@oracle.com"><adam.sotona@oracle.com></a><br>
              <b>Cc: </b>classfile-api-dev
              <a class="moz-txt-link-rfc2396E" href="mailto:classfile-api-dev@openjdk.org"><classfile-api-dev@openjdk.org></a><br>
              <b>Subject: </b>Re: ClassHierarchyResolver changes for
              the Classfile object<o:p></o:p></span></p>
        </div>
        <p>It's a question to the ClassHierarchyResolver interaction
          with the security manager.   Although it's deprecated for
          removal, we still need to consider when it's installed and
          whether the API would throw SecurityException due to the
          security permission check or the implementation is safe to use
          the system class loader loading resources with privilege.<o:p></o:p></p>
        <p>Mandy<o:p></o:p></p>
        <div>
          <p class="MsoNormal"><span style="font-size:11.0pt">On 5/31/23
              5:32 PM, - wrote:<o:p></o:p></span></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoNormal"><span style="font-size:11.0pt">The
                doPrivileged is from Mandy Chung's modification to my
                patch of reimplementation of
                MethodHandleProxies.asInterfaceInstance. It allows
                system code to fetch from system classloader with
                security manager, but I can just leave this change to be
                part of that patch instead.<o:p></o:p></span></p>
          </div>
          <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
          <div>
            <div>
              <p class="MsoNormal"><span style="font-size:11.0pt">On
                  Thu, Jun 1, 2023, 1:34 AM Adam Sotona <<a href="mailto:adam.sotona@oracle.com" moz-do-not-send="true" class="moz-txt-link-freetext">adam.sotona@oracle.com</a>>
                  wrote:<o:p></o:p></span></p>
            </div>
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                  <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
                  <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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                    <p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
                        </span></b><span style="font-size:12.0pt;color:black">classfile-api-dev
                        <<a href="mailto:classfile-api-dev-retn@openjdk.org" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">classfile-api-dev-retn@openjdk.org</a>>
                        on behalf of
                        <a href="mailto:liangchenblue@gmail.com" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">liangchenblue@gmail.com</a>
                        <<a href="mailto:liangchenblue@gmail.com" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">liangchenblue@gmail.com</a>><br>
                        <b>Date: </b>Wednesday, 31 May 2023 8:26<br>
                        <b>To: </b>classfile-api-dev <<a href="mailto:classfile-api-dev@openjdk.org" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">classfile-api-dev@openjdk.org</a>><br>
                        <b>Subject: </b>ClassHierarchyResolver changes
                        for the Classfile object</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                  </div>
                  <div>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;margin-left:36.0pt">
                      <span style="font-size:11.0pt">Hello,<br>
                        Since we are migrating to the Classfile object
                        (8308899), which was<br>
                        initiated by our observation that Class
                        hierarchy resolvers shouldn't<br>
                        always cache their results, I wonder what
                        changes I should adapt to my<br>
                        current patch (8304425, PR #13082).<br>
                        <br>
                        We have already decided a few API changes for
                        the resolver:<br>
                        1. Remove the default hierarchy resolver (at
                        least change to static<br>
                        factories), caching is bound to Classfile
                        lifetime<o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt" lang="EN-US">Yes, but
                        we need to check performance impact on existing
                        use cases (where to extra hold Classfile
                        instance with cache).</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt"><span style="font-size:11.0pt">2. Two new resolver
                        factories: Bytecode/resource parsing and<br>
                        classloading/reflection from a given classloader
                        (The goal of this<br>
                        patch)<o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt" lang="EN-US">Yes.</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt"><span style="font-size:11.0pt"><br>
                        3. The resolution result ClassHierarchyInfo will
                        be converted into an<br>
                        interface; record is an implementation detail
                        (TBD)<o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt" lang="EN-US">This can
                        go even further. To save footprint
                        ClassHierarchyInfo does not need to expose
                        anything, it does not need to carry thisClass
                        and all interface infos can point to a singleton
                        object, something like this:</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">   
                      </span><span style="font-size:11.0pt;color:black">/**</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;color:black">     * <b>Information</b></span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><b><span style="font-size:11.0pt;color:black">about</span></b><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><b><span style="font-size:11.0pt;color:black">a</span></b><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><b><span style="font-size:11.0pt;color:black">resolved</span></b><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><b><span style="font-size:11.0pt;color:black">class</span></b><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><b><span style="font-size:11.0pt;color:black">or</span></b><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><b><span style="font-size:11.0pt;color:black">interface.</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">    
                      </span><span style="font-size:11.0pt;color:black">*/</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">   
                      </span><span style="font-size:11.0pt;color:black">sealed</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">interface</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                        <b><i>ClassHierarchyInfo</i></b></span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">           
                      </span><span style="font-size:11.0pt;color:black">permits</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                        ClassHierarchyImpl.<i>ClassHierarchyInfoImpl</i>
                        {</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black"> </span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">       
                      </span><span style="font-size:11.0pt;color:black">/**</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;color:black">         *
                        {<b>@return</b></span><span style="font-size:11.0pt;font-family:"Courier
                        New \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">the
                        {<b>@link</b></span><span style="font-size:11.0pt;font-family:"Courier
                        New \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">ClassHierarchyInfo}
                        of</span><span style="font-size:11.0pt;font-family:"Courier
                        New \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">an</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">interface}</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;color:black">         *
                        no</span><span style="font-size:11.0pt;font-family:"Courier
                        New \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">other</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">information</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">about</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">interface</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">is</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">required</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">        
                      </span><span style="font-size:11.0pt;color:black">*/</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">       
                      </span><span style="font-size:11.0pt;color:black">static</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                        <i>ClassHierarchyInfo</i> <b><i>ofInterface</i></b>()
                        {</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">           
                      </span><span style="font-size:11.0pt;color:black">return</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                        ClassHierarchyImpl.</span><i><span style="font-size:11.0pt;color:black">INTERFACE_INFO_INSTANCE</span></i><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">;</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">       
                        }</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black"> </span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">       
                      </span><span style="font-size:11.0pt;color:black">/**</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;color:black">         *
                        <b>@return</b></span><span style="font-size:11.0pt;font-family:"Courier
                        New \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">the
                        {<b>@link</b></span><span style="font-size:11.0pt;font-family:"Courier
                        New \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">ClassHierarchyInfo}
                        of</span><span style="font-size:11.0pt;font-family:"Courier
                        New \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">an</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">interface</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;color:black">         *
                        <b>@param</b></span><span style="font-size:11.0pt;font-family:"Courier
                        New \,serif\;color\:black";color:black">
                        superClass
                      </span><span style="font-size:11.0pt;color:black">information</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">about</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">super</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">of</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">the</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">class</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">is</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">required</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">        
                      </span><span style="font-size:11.0pt;color:black">*/</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">       
                      </span><span style="font-size:11.0pt;color:black">static</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                        <i>ClassHierarchyInfo</i> <b><i>ofClass</i></b>(ClassDesc
                        superClass) {</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">           
                      </span><span style="font-size:11.0pt;color:black">return</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                      </span><span style="font-size:11.0pt;color:black">new</span><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">
                        ClassHierarchyImpl.ClassHierarchyInfoImpl(superClass);</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">       
                        }</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white"><span style="font-size:11.0pt;font-family:"Courier New
                        \,serif\;color\:black";color:black">    }</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt"><span style="font-size:11.0pt"><br>
                        <br>
                        What should I do with my patch? Should I drop
                        the changes to default<br>
                        resolver (which adds security manager
                        suppression) and move on with<br>
                        the current content, or should I expand it to
                        address all 3 planned<br>
                        changes (despite some of them still in drafting
                        phase) and accomodate<br>
                        to the Classfile object? (We still have to
                        decide about the default<br>
                        resolver fo a Classfile object, esp. whether to
                        have one or not)<o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt" lang="EN-US">I’m not
                        sure why the default class hierarchy resolver
                        should call
                      </span><span style="font-size:11.0pt">AccessController.doPrivileged</span><span style="font-size:11.0pt" lang="EN-US">?</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="m-6906457239650474240pl-en"><span style="font-size:9.0pt;font-family:Menlo" lang="EN-US"> </span></span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"><br>
                      </span><span style="font-size:11.0pt" lang="EN-US">Thanks,</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                    <p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt" lang="EN-US">Adam</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
                  </div>
                </div>
              </div>
            </blockquote>
          </div>
        </blockquote>
      </div>
    </blockquote>
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