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Get the child covering at least CPU set set.  
- Returns
 NULL if no child matches or if set is empty. 
- Note
 - This function cannot work if parent does not have a CPU set. 
  
 
 
Get the lowest object covering at least CPU set set.  
- Returns
 NULL if no object matches or if set is empty. 
- Note
 - This function cannot work if the root object does not have a CPU set, e.g. if the topology is made of different machines. 
  
 
 
 
	  
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