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Followup question based on your cloning instructions/images.  I have been sampling the starting point in the center of your circles and then using some of the area around that starting point to fill in over dirt.  It sound like I should only be sampling and drawing a "very" small pieces at a time.  This is likely why I see have so much duplication even though I randomly select the start point.  If that is true then I should be able to improve in the future.