Question: # let append_base = ...;; val append_base : 'a -> 'a = # let append_rec x r = ... ;; val append_rec : 'a ->

# let append_base = ...;; val append_base : 'a -> 'a = # let append_rec x r = ... ;; val append_rec : 'a -> ('b -> 'a list) -> 'b -> 'a list = # (fun l -> List.fold_right append_rec l append_base) [1;3] [2;4];; - : int list = [1; 3; 2; 4]

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