Hi whenever i run the code bellow i get the following error.
Oops, try again. remove_duplicates([4, 5, 5, 4]) returned  instead of [4, 5]
I really don't understand why this is! Any advice is greatly appreciated
def remove_duplicates(l1): l2 =  for n in l1: if n not in l1: l2.append(n) return l2