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     The putimage subroutines transfer to the screen the image stored in
     the buffer pointed to by <image>.
 
     In the putimage subroutine, the upper left corner of the image is
     placed at the view-coordinate point (<x>, <y>). In the putimage_w
     routine, the upper left corner of the image is placed at the
     window-coordinate point (<wx>, <wy>).
 
     The <action> argument defines the interaction between the stored
     image and the one already on the screen. It may be any one of the
     following symbolic constants (defined in FGRAPH.FD): $GAND, $GOR,
     $GPRESET, $GPSET, or $GXOR.
 
     Return Value
 
     None.
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