<smil>
 <head>
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     <region id="c1" 
              top="0" 
              left="0" 
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              height="98" 
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  <body>
    <seq>
       <img id="i1"
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            region="c1"
            dur="2s"
       />
       <img id="i2"
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            dur="2s"
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    </seq>
  </body>
</smil>