Add '29.nix'

29.nix

@@ -0,0 +1,9 @@
+with import <nixpkgs> { };
+let
+  listOfNumbers = [2 4 6 9 27];
+  reverseList = lib.fold (x: y: y ++ [x]) [];
+in
+rec {
+  example = lib.reverseList listOfNumbers;
+  result = reverseList listOfNumbers;
+}