The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
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of the most enduring properties of the 3614/3624: their handling of PIN numbers.
They included the Iceni tribe of East Anglia, which was led by queen Boudica in her failed uprising against the Romans in AD60 to 61.