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<html>
  <head>
    <script>
    var bc;
    window.onpageshow = function(pageshow) {
      bc.onmessage = function(event) {
        bc.close();
        if (event.data == "loadnext") {
          location.search = "?nextpage";
        } else if (event.data == "back") {
          history.back();
        }
      }
      bc.postMessage({type: "pageshow", persisted: pageshow.persisted });
      if (pageshow.persisted) {
        document.body.appendChild(document.createElement("iframe"));
        bc.close();
        window.close();
      }
    }
    </script>
  </head>
  <body>
  </body>
</html>