The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
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Responding to questions as to why costs were allowed to spiral for so long, an NHS spokesperson said the length of time it takes public sector organisations to procure contracts "can vary", and the nature of the contract was "complex".
Doohan revealed threats and abuse on Drive to Survive