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  Include:  FGRAPH.FI, FGRAPH.FD
 
  Type:     INTEGER*2 FUNCTION
 
  Routine:  setwritemode( action )
            INTEGER*2 action
 
  Returns:  the previous write mode, or -1 if an error occurs.
 
  See also: getwritemode, lineto, putimage, rectangle, setcolor,
            setlinestyle
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