A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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Murray played in several semi-successful prog-rock and jazz fusion bands during the late 1960s and early 70s.
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"So two of our grandparents are unfortunately no longer present, one works full time and the other one has her own health concerns," he added.