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generic
type Element_T is private;
package Opt27_Pkg is
type Node_T is private;
type List_T is private;
function Is_Null (Node : in Node_T) return Boolean;
generic
type Template_T is private;
with function Is_Match
(Element : in Element_T;
Template : in Template_T) return Boolean is <>;
function Find_Elem (Template : Template_T; List : List_T) return Node_T;
private
type Node_Rec_T;
type Node_T is access Node_Rec_T;
type List_T is record
First_Node : Node_T := null;
Last_Node : Node_T := null;
end record;
end Opt27_Pkg;
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