Privilege drop — run as nobody (UID 65534) with PR_SET_NO_NEW_PRIVS
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The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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Donald Campbell, advocacy director at Foxglove, a group of campaigning lawyers, said Miliband's letter to the committee "raises more questions than it answers".