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   NAME
	AndRectRegion -- Perform 2d AND operation of rectangle
			 with region, leaving result in region.

   SYNOPSIS
	AndRectRegion(region,rectangle)
 			a0	a1

	void AndRectRegion( struct Region *, struct Rectangle * );

   FUNCTION
	Clip away any portion of the region that exists outside
	of the rectangle. Leave the result in region.

   INPUTS
	region - pointer to Region structure
	rectangle - pointer to Rectangle structure

   NOTES
	Unlike the other rect-region primitives, AndRectRegion() cannot
	fail.

   BUGS

   SEE ALSO
	AndRegionRegion() OrRectRegion() graphics/regions.h