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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.
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Experts say adding the varicella vaccine to the official NHS childhood immunisation programme will dramatically reduce the number of people who catch chickenpox, leading to far fewer serious cases.
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