The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.
Step through the Python implementation. Watch the algorithm decide which branches to visit and which to prune:
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第三条 增值税法第三条所称单位，包括企业、行政机关、事业单位、军事单位、社会组织及其他单位。
Modernising phrases