Grouping the selected elements requires that additional element(s) also be grouped. [Description] To satisfy the grouping requirement, these additional element(s) will be automatically added to the group as well. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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