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        Select a representation and click the command.
         The Iterations dialog box appears, with the number of
          available iterations at the top, and the iterations displayed on a line at the bottom. The
          iterations are numbered from the most recent to the oldest, and the list is refreshed
          every time you select a new representation. 
        Optional: If you selected a 3D part or 3D shape, a preview of the
          iterations is displayed. To modify the display of the preview, right-click the background
          and select an ambience. 
      Optional: 
        To switch between views, click one of the following commands from the toolbar:
        
          Sequential View
             : The iterations are displayed as successive sequences of equal size on the iteration
            line.Timeline View
             :
            The iterations are displayed as successive sequences of different sizes on the iteration
            line, depending on their duration.
        To navigate between iterations, hover over the iteration line, and click the iteration
          of your choice.
        
        
      
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