Regions with many nearby points keep subdividing. Regions with few or no points stay large. The tree adapts to the data: dense areas get fine-grained cells, sparse areas stay coarse. The split grid is predetermined (always at midpoints), but the tree only refines cells that need it. Sparse regions stay as single large nodes while dense regions subdivide deeply.
Fergal Monsell, of the British Orthopaedic Association (BOA), which represents joint surgeons, said his organisation was working with NHS bosses to limit the impact on patients.
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The agreement also includes an order barring Walmart from changing its initial offer of compensation for jobs, except under limited circumstances.