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Baroness Amos also said in a statement that it was "clear from the meetings and conversations I have had with hundreds of women, families and staff members across the country, that maternity and neonatal services in England are failing too many women, babies, families and staff".
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.