they are the same1 slice, and mutating one will mutate the other.
Москвичей предупредили о потепленииСиноптик Ильин: 1 марта в Москве потеплеет до плюс 4 градусов。关于这个话题，91视频提供了深入分析
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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.，更多细节参见爱思助手下载最新版本
Жители Санкт-Петербурга устроили «крысогон»17:52