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<apex:page>

          <script src="../../soap/ajax/42.0/connection.js" type="text/javascript"></script>

          <script>

               sforce.connection.sessionId='{!GETSESSIONID()}';

          ...

          </script>

     ...

</apex:page>

<body>
    {!requireScript("/soap/ajax/42.0/connection.js")}
    ...