"error": {
The BBC has apologised several times since the broadcast on 22 February, and the ceremony remains unavailable to watch on iPlayer after the corporation removed it the following day.
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The algorithm also visits children in order of distance to the query point. This means it checks the most promising quadrants first, which tends to find a good candidate early and enables aggressive pruning of the remaining quadrants. Without this ordering, the algorithm would still produce the correct result, but it would prune fewer nodes.
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