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	    plclear
	  ( | ); | 
      Clears the current page, effectively erasing everything that have
      been drawn.  This command only works with interactive drivers; if the driver
      does not support this, the page is filled with the background color in use.
      If the current page is divided into subpages, only the current subpage
      is erased.  The nth subpage can be selected with pladv(n).
    
Redacted form:
	    General: plclear()
	  
This function is not used in any examples.