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+
+
+--  Programmed by Jedidiah Barber
+--  Licensed under the Sunset License v1.0
+
+--  See license.txt for further details
+
+
+package body Kompsos.Prelude is
+
+
+    function Head
+           (This                 : in World;
+            Full_List, Head_Term : in Term'Class)
+        return World is
+    begin
+        return Result : World := This do
+            Result.Unify (T (Head_Term & T (Result.Fresh)), Full_List);
+        end return;
+    end Head;
+
+    procedure Head
+           (This                 : in out World;
+            Full_List, Head_Term : in     Term'Class) is
+    begin
+        This := Head (This, Full_List, Head_Term);
+    end Head;
+
+
+    function Tail
+           (This                 : in World;
+            Full_List, Tail_Term : in Term'Class)
+        return World is
+    begin
+        return Result : World := This do
+            Result.Unify (T (T (Result.Fresh) & Tail_Term), Full_List);
+        end return;
+    end Tail;
+
+    procedure Tail
+           (This                 : in out World;
+            Full_List, Tail_Term : in     Term'Class) is
+    begin
+        This := Tail (This, Full_List, Tail_Term);
+    end Tail;
+
+
+    function Cons
+           (This                            : in World;
+            Head_Term, Tail_Term, Full_List : in Term'Class)
+        return World is
+    begin
+        return Result : World := This do
+            Result.Unify (T (Head_Term & Tail_Term), Full_List);
+        end return;
+    end Cons;
+
+    procedure Cons
+           (This                            : in out World;
+            Head_Term, Tail_Term, Full_List : in     Term'Class) is
+    begin
+        This := Cons (This, Head_Term, Tail_Term, Full_List);
+    end Cons;
+
+
+    function Nil
+           (This     : in World;
+            Nil_Term : in Term'Class)
+        return World is
+    begin
+        return Result : World := This do
+            Result.Unify (Null_Term, Nil_Term);
+        end return;
+    end Nil;
+
+    procedure Nil
+           (This     : in out World;
+            Nil_Term : in     Term'Class) is
+    begin
+        This := Nil (This, Nil_Term);
+    end Nil;
+
+
+    function Pair
+           (This      : in World;
+            Pair_Term : in Term'Class)
+        return World is
+    begin
+        return Result : World := This do
+            Result.Unify (T (T (Result.Fresh), T (Result.Fresh)), Pair_Term);
+        end return;
+    end Pair;
+
+    procedure Pair
+           (This      : in out World;
+            Pair_Term : in     Term'Class) is
+    begin
+        This := Pair (This, Pair_Term);
+    end Pair;
+
+
+end Kompsos.Prelude;
+
+