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     The getwritemode function returns the current logical write mode,
     which is used when drawing lines with the lineto, polygon, and
     rectangle functions.
 
     The default value is $GPSET, which causes lines to be drawn in the
     current graphics color. The other possible return values are $GAND,
     $GOR, $GPRESET, and $GXOR.
 
     Return Value
 
     The getwritemode function returns the current logical write mode,
     or -1 if not in graphics mode.
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