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      1 <html>
      2 <head>
      3 <script>
      4 window.addEventListener("message", messageReceived, false);
      5 
      6 function messageReceived(event) {
      7   if (event.data === 'msg4') {
      8     window.top.document.title = event.data;
      9   } else {
     10     event.source.postMessage("2-1-reply", "*");
     11   }
     12 }
     13 </script>
     14 </head>
     15 <body>
     16 
     17 Frame 2-1.
     18 <br>
     19 
     20 </body>
     21 </html>
     22