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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT LIBRARY COMPONENTS                          --
+--                                                                          --
+--       A D A . C O N T A I N E R S . R E D _ B L A C K _ T R E E S .      --
+--               G E N E R I C _ S E T _ O P E R A T I O N S                --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+-- This specification is adapted from the Ada Reference Manual for use with --
+-- GNAT.  In accordance with the copyright of that document, you can freely --
+-- copy and modify this specification,  provided that if you redistribute a --
+-- modified version,  any changes that you have made are clearly indicated. --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with Ada.Containers.Red_Black_Trees.Generic_Operations;
+
+generic
+   with package Tree_Operations is new Generic_Operations (<>);
+
+   use Tree_Operations.Tree_Types;
+
+   with procedure Insert_With_Hint
+     (Dst_Tree : in out Tree_Type;
+      Dst_Hint : Node_Access;
+      Src_Node : Node_Access;
+      Dst_Node : out Node_Access);
+
+   with function Copy_Tree (Source_Root : Node_Access)
+       return Node_Access;
+
+   with procedure Delete_Tree (X : in out Node_Access);
+
+   with function Is_Less (Left, Right : Node_Access) return Boolean;
+
+   with procedure Free (X : in out Node_Access);
+
+package Ada.Containers.Red_Black_Trees.Generic_Set_Operations is
+   pragma Pure;
+
+   procedure Union (Target : in out Tree_Type; Source : Tree_Type);
+
+   function Union (Left, Right : Tree_Type) return Tree_Type;
+
+   procedure Intersection (Target : in out Tree_Type; Source : Tree_Type);
+
+   function Intersection (Left, Right : Tree_Type) return Tree_Type;
+
+   procedure Difference (Target : in out Tree_Type; Source : Tree_Type);
+
+   function Difference (Left, Right : Tree_Type) return Tree_Type;
+
+   procedure Symmetric_Difference
+     (Target : in out Tree_Type;
+      Source : Tree_Type);
+
+   function Symmetric_Difference (Left, Right : Tree_Type) return Tree_Type;
+
+   function Is_Subset (Subset : Tree_Type; Of_Set : Tree_Type) return Boolean;
+
+   function Overlap (Left, Right : Tree_Type) return Boolean;
+
+end Ada.Containers.Red_Black_Trees.Generic_Set_Operations;