Structure
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- Each internal node entry contains
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- Routing object
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- Covering tree
 : subtree of
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- Covering radius
 : all objects in  is within distance from
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- Distance of to its parent
 :
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- Covering radius
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- point to actual data object
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- Minimum distance from object
 to any object in is 
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- Maximum distance from object to any object in is
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