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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Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
In practice, this means: