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diff --git a/p99/p14.neb b/p99/p14.neb
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+; P14: Duplicate the elements of a list.
+
+(def a (list "a" "b" "c" "c" "d"))
+
+(func dup (lst)
+    (reduce
+        (lambda (acc item)
+            (append
+                (append acc item)
+                item))
+        lst
+        (list)))
+
+(print (->string a))
+(print (->string (dup a)))