The algorithm walks the tree recursively. At each node, it checks: does this node's bounding box overlap with the query rectangle? If not, the entire subtree gets pruned (skipped). If it does overlap, it tests the node's points against the query and recurses into the children.
Why are Afghanistan and Pakistan fighting?
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The stunning image is the largest ever obtained by the specialist telescope in Chile called the Atacama Large Millimeter/submillimeter Array (Alma) radio telescope, according to the group behind the project.
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